5-Methoxy-N,N-dimethyltryptamine (5-MEO-DMT) for treating depression

Abstract

Compositions are provided for use in treating patients suffering from psychiatric disorders, particularly major depressive disorder, persistent depressive disorder, anxiety disorder, post-traumatic stress disorder, body dysmorphic disorder, obsessive-compulsive disorder, eating disorders, and psychoactive substance abuse. Additionally, dosing regimens for treating these disorders are provided.

Description

[Technical field]

[0001] The present invention is directed to improved methods for the treatment of psychiatric disorders, in particular major depressive disorder, persistent depressive disorder, anxiety disorders, post-traumatic stress disorder, body dysmorphic disorder, obsessive-compulsive disorder, eating disorders and psychoactive substance abuse, comprising administering to a patient in need thereof a therapeutically effective amount of 5-methoxy-N,N-dimethyltryptamine (5-MeO-DMT). [Background technology]

[0002] Hallucinogens are some naturally occurring and some synthetic chemicals that are defined by their ability to induce sensory distortions in humans after ingestion, such as changes in hearing and vision, as well as mood and cognitive distortions. The term hallucinogens encompasses a fairly broad group of psychoactive molecules with different modes of action. It has been suggested that some psychiatric disorders are in principle responsive to treatment with psychoactive molecules. Summary of the Invention

[0003] The present invention relates to 5-methoxy-N,N-dimethyltryptamine (5-MeO-DMT) or a pharma- ceutically acceptable salt thereof for use in the treatment of psychiatric disorders, in particular major depressive disorder, persistent depressive disorder, anxiety disorder, post-traumatic stress disorder, body dysmorphic disorder, obsessive-compulsive disorder, eating disorders and psychoactive substance abuse comprising administering a therapeutically effective amount of 5-MeO-DMT to a patient in need thereof.

[0004] The present invention particularly relates to 5-Methoxy-N,N-Dimethyltryptamine (5-MeO-DMT) or a pharma- ceutically acceptable salt thereof for use in the treatment of a patient diagnosed with major depressive disorder by a qualified professional according to accepted medical practice. The disorder may be diagnosed according to the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5) published by the American Psychiatric Association. For example, the patient may suffer from moderate or severe major depressive disorder as indicated by a Montgomery-Asberg Depression Rating Scale (MADRS) score of 20 or greater, or a Hamilton Depression Rating Scale (HAM-D) score of 17 or greater. It is further contemplated that the patient may suffer from severe major depressive disorder as indicated by a Montgomery-Asberg Depression Rating Scale (MADRS) score of 35 or greater, or a Hamilton Depression Rating Scale (HAM-D) score of 25 or greater. The patient may be diagnosed with treatment-resistant major depressive disorder.

[0005] Additionally, the patient may suffer from suicidal ideation, particularly with the intent to carry it out. The patient may even be at imminent risk of suicide.

[0006] 5-MeO-DMT or a pharma- ceutically acceptable salt thereof may be administered in a dose or dosage regimen that allows the patient to experience a peak psychedelic experience. A dosage of about 4 mg to about 20 mg of 5-MeO-DMT or an equimolar amount of a pharma- ceutically acceptable salt may be administered. Additionally, the dosage may be about 6 mg or about 12 mg or about 18 mg of 5-MeO-DMT or an equimolar amount of a pharma-ceutically acceptable salt.

[0007] 5-MeO-DMT or a pharma- ceutically acceptable salt may be administered in a first dosage for a first administration, and then in 0 to 6 subsequent administrations, each subsequent administration using a higher dosage than the previous administration unless the patient experiences a climax psychedelic experience.

[0008] Further, 5-MeO-DMT may be administered at a dosage of about 2 mg to about 8 mg for a first administration, then increased to a dosage of about 8 mg to about 14 mg for a second administration unless the patient has already experienced a peak psychedelic experience, and then increased to a dosage of about 14 mg to about 20 mg for a third administration unless the patient has already experienced a peak psychedelic experience, or an equimolar amount of a pharma- ceutically acceptable salt may be administered in place of 5-MeO-DMT. The first dosage of 5-MeO-DMT may be about 6 mg, the second dosage of 5-MeO-DMT may be about 12 mg, the third dosage of 5-MeO-DMT may be about 18 mg, or an equimolar amount of a pharma- ceutically acceptable salt may be administered in place of 5-MeO-DMT.

[0009] The interval between two administrations may be from 1 hour to 24 hours, preferably about 2 to 4 hours.

[0010] The occurrence of a peak psychedelic experience can be identified by achievement of at least 60% of the highest possible score on each of the four subscales (mystical, positive mood, transcendence in time and space, and indescribable) of the 30-item Revised Mystical Experiences Questionnaire (MEQ30), or by achievement of at least 60% of the highest possible score on the Oceanic Feeling (OBN) facet of the Altered States of Consciousness (ASC) Questionnaire, or preferably by achievement of a total score of at least 75 on the Peak Psychedelic Experiences Questionnaire (PPEQ).

[0011] 5-MeO-DMT or a pharma- ceutically acceptable salt thereof is preferably administered by inhalation. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof may be administered in the form of an aerosol, in particular comprising (a) a pharma- ceutical acceptable gas, (b) aerosol particles of 5-methoxy-N,N-dimethyltryptamine (5-MeO-DMT) or a pharma- ceutical acceptable salt thereof, the aerosol having a mass density of the aerosol particles of about 0.5 mg / l to about 12.5 mg / l. The aerosol may be generated by a) exposing a thin layer of 5-MeO-DMT or a pharma- ceutical acceptable salt thereof, configured on a solid support, to thermal energy, and b) passing air through the thin layer to create aerosol particles. The aerosol preferably contains 5-MeO-DMT in the form of a free base.

[0012] When administered by inhalation, the dosage of 5-MeO-DMT or a pharma- ceutically acceptable salt administered to a patient is preferably inhaled in one breath.

[0013] Treatment with 5-MeO-DMT or a pharma- ceutically acceptable salt thereof as set forth above results in a clinical response, which may be measured by a score of at least "marked improvement" on the Clinical Global Impression-Improvement (CGI-I) score or the Patient Global Impression-Improvement (PGI-I) score, with the improvement preferably occurring within about 2 hours after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof.

[0014] The clinical response, as determined by a score of at least "marked improvement" in the CGI-I score or PGI-I score, preferably persists for at least 6 days, more preferably at least 14 days, and especially at least 28 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof.

[0015] The clinical response may also be determined by at least a 50% improvement in MADRS or HAM-D score compared to the respective scores before administration of 5-MeO-DMT. This response preferably occurs within about 2 hours after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. Furthermore, remission of depressive symptoms, as determined by a MADRS score of 10 or less or a HAM-D score of 7 or less, preferably occurs within about 2 hours after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof.

[0016] The clinical response, as determined by at least a 50% improvement in MADRS or HAM-D score compared to the respective score before treatment, preferably persists for at least 6 days, more preferably at least 14 days, and especially at least 28 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof.

[0017] Preferably, the clinical response, as determined by at least a 75% improvement in MADRS or HAM-D score compared to the respective scores before treatment, is present 7 days, more preferably even 14 days, and especially even 28 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. More preferably, the patient is in remission of depressive symptoms, as determined by a MADRS score of 10 or less or a HAM-D score of 7 or less, 7 days, preferably even 14 days, and especially even 28 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof.

[0018] Further aspects of the present invention are defined below in the embodiments section. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hallucinogens include, for example, tetrahydrocannabinol (THC), a cannabinoid that acts on cannabinoid receptors, 3,4-methylenedioxymethamphetamine (MDMA, "ecstasy"), an entactogen that acts on the trace amine associated receptor 1 (TAAR1) and vesicular monoamine transporter 2 (VMAT2), and ketamine, a dissociative anesthetic that acts as an N-methyl-D-aspartate (NMDA) receptor antagonist.

[0020] A further group of hallucinogens includes compounds that bind to 5-hydroxytryptamine (5-HT) or serotonin receptors (seven families, 5-HT1 to 5-HT7, and 14 subtypes are described), such as lysergic acid diethylamide (LSD), psilocybin, and N,N-dimethyltryptamine (DMT). This latter group of serotonergic agents is often referred to as "classical hallucinogens" or "psychedelics", emphasizing their primary ability to induce qualitative alterations in states of consciousness such as euphoria, trance, transcendence of time and space, spiritual experiences, collapse of self-boundaries or even near-death experiences, with only minimal other effects such as sedation, narcosis, or hyperstimulation.

[0021] Chemically, serotonergic psychedelics are either phenylalkylamines or indolamines, the class of indolamines being divided into two subsets, the ergolines and tryptamines, the latter of which have the following formula:

[0022] [ka]

[0023] It is derived from tryptamine, which has the formula:

[0024] Various serotonergic psychedelics have different binding affinities and activation capacities for various serotonin receptors, particularly 5-HT1A, 5-HT2A and 5-HT2C, and their activity may also be modulated by interactions with other targets such as monoamine transporters and trace amine associated receptors.

[0025] Naturally occurring psychedelics such as DMT, a tryptamine found in the South American shrub Psychotria Viridis, psilocybin, a tryptamine found in over 200 mushroom species, or mescaline, a phenylalkylamine found in the Ubatama cactus of the southwestern United States and northern Mexico, have been used for centuries by indigenous cultures in ritual or sociocultural contexts and in religious sacramental settings. The use of naturally occurring psychedelics in these settings has been attributed to unspecified "curative" potential, but more scientific investigation of their potential therapeutic applications for established disease entities was only explored after the discovery of the synthetic ergoline LSD in 1943.

[0026] Although these early clinical experiences in the 1950s and 1960s were still relatively methodologically tenuous, promising data emerged, for example, from treatment programs for alcoholism, where patients receiving LSD in conjunction with psychotherapy showed higher rates of abstinence or improvement than those receiving psychotherapy alone (Jensen SE, QJ Stud Alcohol. 1962; 23:315-20), or from observations of patients with personality disorder or anxiety, where the administration of LSD as an adjunct to psychotherapy produced outcomes of "marked improvement" or "improvement" in over 90% of patients (MacLean JR et al., QJ Stud Alcohol. 1961; 22:34-45), or from the treatment of patients with terminal cancer, where approximately two-thirds of patients treated with LSD improved to various degrees (Pahnke WN et al., Psychedelic drugs. Proceedings of a Hahnemann Medical College and Hospital Symposium. Editors: Richard E. Hicks, Paul Jay Fink, Van Buren O. Hammett. Grune & Stratton, New York / London 1969, pp.33-42).

[0027] With the emergence of knowledge about the serotonin system and its role in brain functioning, the molecular activities of an increasing number of psychedelic drugs have been identified by researchers. However, it has been somewhat unclear how that activity translates into their observed therapeutic effects in psychiatric disorders. Two main concepts have been proposed: the first was named "psychotropic therapy", which emphasized the ability of psychedelic drugs administered in low doses to promote the relaxation of psychological defense mechanisms, thereby allowing, in combination with psychotherapy, deep introspective insights and the regeneration of trauma, and the ensuing catharsis. Thus, the fundamental mechanism considered in the psychotropic approach was the activation and deepening of the combined psychotherapeutic process, which required multiple drugs and therapy sessions. The second concept was named "psychedelic therapy", which emphasized the ability of psychedelic drugs administered in high single doses to induce the so-called "peak psychedelic experience". Peak experiences are primarily characterized by the loss of judgment of time and space and the collapse of ego boundaries, which often culminates in states of bliss and the experience of a feeling of complete and harmonious existence in the oneness of the universe. Thus, the basic mechanism considered in the psychedelic approach was to produce a unique overwhelming experience accompanied by an intuitive perception of psychological integrity and harmony, followed by a sense of self-improvement and increased joy of living and inner peace.

[0028] Although scientific research into the use of psychedelic drugs to treat mental disorders developed in the 1960s, recreational use of these substances also spread rapidly, and psychedelics were soon portrayed in the media as extremely dangerous drugs of abuse. The perception of their danger to social order led to the passage of the 1970 US Controlled Substances Act, under which LSD and other psychedelic drugs were classified as Schedule 1, the most restrictive category containing drugs deemed to have no medical use and a high potential for abuse. Over the next three decades, very little progress was made regarding the possible therapeutic uses of psychedelic drugs.

[0029] Only in recent years has interest in the field of psychedelic therapy been rekindled. For example, a randomized, double-blind, crossover study comparing a single very low placebo-like dose of psilocybin with a single high dose in 51 cancer patients with anxiety and / or mood symptoms showed that the high dose produced greater reductions in clinical and self-rated measures of depression, anxiety or mood disturbance after 5 weeks of treatment, as well as increases in quality of life measures, with these effects sustained at 6 months (Griffiths RR et al., J Psychopharmacol. 2016; 30(12):1181-1197). In another randomized, double-blind, crossover study of a single dose of psilocybin versus niacin as comparator in 29 cancer patients with anxiety and depression, psilocybin produced immediate substantial improvement in anxiety and depression, reduced cancer-related demoralization and hopelessness, and improved quality of life, with sustained effects at 6.5 months follow-up (Ross S et al., J Psychopharmacol. 2016; 30(12):1165-1180). Further positive experiences with silobicin occurred in an open-label, single-arm feasibility study in which 20 patients with treatment-resistant depression (defined in detail in the study) were given low and high doses of silobicin, 7 days apart, and experienced significant reductions in depressive symptoms from baseline 1 and 5 weeks after treatment (Carhart-Harris RL et al., Lancet Psychiatry. 2016; 3(7):619-27; Carhart-Harris RL et al., Psychopharmacology (Berl). 2018; 235(2):399-408).Psilocybin has also shown promise in treating obsessive-compulsive disorder (Moreno FA et al., J Clin Psychiatry. 2006; 67(11):1735-40) and alcoholism (Bogenschutz MP et al., J Psychopharmacol. 2015; 29(3):289-99) and tobaccoism (Johnson MW et al., J Psychopharmacol. 2014; 28(11):983-92; Johnson MW et al., Am J Drug Alcohol Abuse. 2017; 43(1):55-60). Furthermore, a double-blind, randomized, active placebo-controlled pilot study of the serotonergic psychedelic LSD in 12 patients with anxiety secondary to a life-threatening illness reported significant effects on anxiety measures at 2-month follow-up (Gasser P et al., J Nerv Ment Dis. 2014; 202(7):513-20). Also, a randomized, double-blind, placebo-controlled single-dose session study of ayahuasca, a shamanic tea containing the psychoactive agent DMT in combination with the monoamine oxidase (MAO) inhibitors harmine, harmaline and tetrahydroharmine, in 35 patients with treatment-resistant major depression (defined in detail in the study) showed rapid antidepressant effects compared to placebo (Palhano-Fontes F et al., bioRxiv 103531. 2017; doi: https: / / doi.org / 10.1101 / 103531).

[0030] The inventor believes that these results indicate that administration of certain serotonergic psychedelic drugs may be a promising approach for the treatment of various psychiatric disorders. However, no efficacy and safety studies that meet regulatory standards have been conducted at this time, and no psychedelic drugs have been approved by any regulatory agency. Furthermore, the currently available data makes it clear that none of the drugs tested achieve remission in all patients, that some patients may lose response after achieving remission, and that the drugs tested still suffer from associated side effects. In addition, the acute psychedelic effects after oral administration of psychedelic drugs currently proposed for therapeutic use last for several hours, which is inconvenient for patients and providers and imposes significant limitations on their practical application. For example, in a study of psilocybin in treatment-resistant depression (defined in detail in the study) published by Carhart-Harris et al., 9 of 20 patients responded at week 5, but 3 relapsed again by month 6, and side effects of anxiety, headache, and nausea were frequently reported, necessitating at least 7 hours of monitoring after drug administration, based on the duration of the acute psychedelic effects of psilocybin of approximately 5-6 hours (Carhart-Harris RL et al., Lancet Psychiatry. 2016; 3(7):619-27; Carhart-Harris RL et al, Psychopharmacology (Berl). 2018; 235(2):399-408). In addition, a more rapid onset of clinical response would be beneficial, as well as a shorter duration of psychedelic effects compared to currently available treatments and currently studied psychedelics. Furthermore, although it has been suggested that some psychiatric disorders may in principle be responsive to treatment with psychedelics, specific disease entities and specific subgroups of disease entities remain to be identified.

[0031] It is therefore an object of the present invention to provide compounds for improved psychoactive therapies and dosage regimens for said therapies that are more effective (i.e., (a) a higher percentage of patients experiencing a clinical response, b) a greater mean clinical response, c) a faster onset of clinical response, d) a more sustained clinical response) than previously described therapies. A further object of the present invention is to provide compounds for improved psychoactive therapies and dosage regimens for said therapies that have a better safety profile and / or are better tolerated than previously described therapies. Another object of the present invention is to provide compounds for improved psychoactive therapies and dosage regimens for said therapies that are more convenient than previously described therapies. Another object of the present invention is to provide compounds for improved psychoactive therapies and dosage regimens for said therapies that are associated with higher patient compliance rates (including higher treatment initiation rates) than previously described therapies. Yet a further object of the present invention is to identify specific disease entities and specific subgroups of disease entities that would benefit from such improved psychoactive therapies.

[0032] Currently available treatments for psychiatric disorders, particularly major depressive disorder, persistent depressive disorder, anxiety disorders, post-traumatic stress disorder, body dysmorphic disorder, obsessive-compulsive disorder, eating disorders and psychoactive substance abuse, are often inadequate due to limited or non-sustained treatment response, delayed onset of response, side effects that limit long-term drug administration, and inconvenient dosing regimens that often limit patient compliance.

[0033] Recently published clinical studies using serotonergic psychedelic drugs such as LSD, psilocybin and DMT (using the shamanic tea ayahuasca) for some of these psychiatric disorders suggest that these compounds may be alternatives to currently available treatments. However, even with these drugs, not all patients respond, and some lose response over time and develop certain side effects. Furthermore, the acute psychoactive effects of the compounds and dosing regimens tested so far last for several hours after administration, which poses significant implementation and convenience issues. Also, the onset of clinical response with these compounds is not rapid enough for the treatment of patients with active suicidal ideation with the intention to act, including, for example, highly symptomatic patients or those at imminent risk of suicide. Finally, although some indications have been shown in principle to be responsive to treatment with these serotonergic psychedelic agents, specific disease entities and specific subgroups of disease entities have yet to be identified.

[0034] Thus, the technical problem solved by the present invention is to provide improved psychoactive therapies based on the administration of serotonergic psychedelic drugs in patients with psychiatric disorders broadly defined. The technical problem further includes the identification of specific psychiatric disorders and subgroups of psychiatric disorders that are responsive to treatment with such improved therapies.

[0035] Most serotonergic psychedelics are thought to mediate their psychoactive effects primarily through the 5-HT2A receptor, although other receptors also play a role and the complete pharmacology is somewhat complex. Moreover, there is no clear correlation between various psychiatric conditions and specific 5-HT receptor systems, so it is not easily predictable which particular receptor affinity profile of a psychedelic drug will provide optimal therapeutic effects.

[0036] The inventors have recognised that the occurrence of a peak psychedelic experience in the acute phase following administration of a particular psychedelic drug drives its therapeutic benefit, either causally or at least as a surrogate behavioural marker of an underlying unknown therapeutic mechanism.

[0037] The inventor believes that the association between the type and intensity of psychedelic experience is supported by, for example, studies on depression and anxiety in patients with life-threatening cancer, in which Griffiths et al. reported that mystical experience scores immediately after the session following administration of psilocybin showed a significant association with various treatment outcome measures 5 weeks later (Griffiths RR et al., J Psychopharmacol. 2016; 30(12):1181-1197). Also, a comparative study in cancer patients with anxiety and depression reported by Ross et al. found that the intensity of subjective mystical experience during drug exposure was significantly related to clinical benefit (e.g., suggesting causality) (Ross S et al., J Psychopharmacol. 2016; 30(12):1165-1180). A study of psilocybin in treatment-resistant depression (defined in detail in the study) found that oceanic sensations (OBN) (which share characteristics with mystical-type experiences, such as oneness and blissful states) were significantly more predictive of reducing depressive symptoms than the more global visual and auditory effects of psilocybin (Roseman L et al., Front Pharmacol. 2018; 8:974). Furthermore, a study of psilocybin in alcoholism by Bogenschutz et al. found that the strength of effect at the first psilocybin session was highly predictive of change in drinking at weeks 5-8 (Bogenschutz MP et al., J Psychopharmacol. 2015; 29(3):289-99). Additionally, in a study of tobacco dependence by Johnson et al., those who were abstinent at 6 months had significantly higher scores on an index of psilocybin-induced mystical experiences compared to those who relapsed (Johnson MW et al., J Psychopharmacol. 2014; 28(11):983-92; Garcia-Romeu A, Curr Drug Abuse Rev. 2014;7(3):157-64).Similar observations had already been made in early psychedelic drug studies, which reported, for example, that in alcoholics treated with LSD, "50 percent of them changed [i.e. became sober or became much better]...As a rule, those who did not have a transcendental experience did not change; they continued to drink. But a high proportion of those who did have a transcendental experience did change" (quoted in Unger SM, Psychiatry. 1963; 26:111-25). Indeed, these early experiences prompted the concept of "psychedelic therapy" discussed above.

[0038] The inventors believe that the key role of the type and intensity of acute psychedelic experience on long-term clinical improvement in such a wide range of psychiatric conditions can be explained by recent observations on the functional connectivity (FC) of the human brain via so-called resting-state networks (RSNs). These RSNs have been shown to be responsible for various aspects of complex cognitive functions, and it has been found that these connectivity networks can be disrupted in patients with psychiatric disorders, in particular major depressive disorder, persistent depressive disorder, anxiety disorder, post-traumatic stress disorder, body dysmorphic disorder, obsessive-compulsive disorder, eating disorders and psychoactive substance abuse, as well as suicidal ideation, which may be comorbid with these disorders.

[0039] The inventors believe that disruption of the normal hierarchical organization of RSNs is a final common pathway for these diseases, which may explain why many of the implicated diseases can occur simultaneously in the same patient. The inventors have shown that a) administration of psychedelic drugs such as psilocybin, LSD and DMT can result in a decrease in connectivity within specific RSNs (Carhart-Harris RL et al., Sci Rep. 2017; 7(1):13187; Palhano-Fontes F et al., PLoS One. 2015; 10(2):e0118143; Carhart-Harris RL et al., Proc Natl Acad Sci US A. 2016; 113(17):4853-8) and b) this decrease in connectivity correlates with ratings of peak experiences (Carhart-Harris RL et al., Sci Rep. 2017;7(1):13187; Carhart-Harris RL et al., Proc Natl Acad Sci US A. 2016; 113(17):4853-8), and c) increased reorganization (or normalization) of specific RSN activity can be observed following a peak experience (Carhart-Harris RL et al., Sci Rep. 2017; 7(1):13187), which d) correlates with treatment response (Carhart-Harris RL et al., Sci Rep. 2017; 7(1):13187), which we believe explains the observation that the type and intensity of acute psychedelic experience correlates with treatment outcome.

[0040] The inventors have recognized that the occurrence of a peak experience is a surrogate behavioral marker of an important mechanism, or at least an underlying mechanism, of the therapeutic efficacy of psychedelic drugs. Thus, the inventors have recognized that achieving a peak experience more rapidly, in a higher percentage of patients, and with better reproducibility within individual patients compared to previously tested psychedelic agents and dosing regimens would result in a better therapeutic profile.

[0041] The inventors have identified 5-MeO-DMT (see formula below) as a serotonergic psychedelic drug with a greater tendency to induce peak experiences than serotonergic psychedelics previously investigated for the treatment of neurological disorders, and have further recognized that 5-MeO-DMT-based peak experiences are more frequently accompanied by the collapse of ego boundaries and experiences of bliss and / or oneness. The inventors have also recognized that 5-MeO-DMT can induce peak experiences more rapidly and the duration of the psychedelic experience is shorter than that of serotonergic psychedelics previously investigated for the treatment of neurological disorders. The inventors believe that these characteristics of 5-MeO-DMT are associated with an improved therapeutic profile and can be explained by specific changes in RSN activity upon 5-MeO-DMT treatment.

[0042] [ka]

[0043] In one aspect, the present invention relates to the use of a therapeutically effective amount of 5-MeO-DMT in the treatment of psychiatric disorders, particularly major depressive disorder, persistent depressive disorder, anxiety disorder, post-traumatic stress disorder, body dysmorphic disorder, obsessive-compulsive disorder, eating disorder and psychoactive substance abuse.The use of a therapeutically effective amount of 5-MeO-DMT in the treatment of such disorders includes the use of a therapeutically effective amount of 5-MeO-DMT in patients with such disorders and suicidal ideation.This includes the use of a therapeutically effective amount of 5-MeO-DMT in patients with treatment-resistant forms of such disorders, including in patients with suicidal ideation.All of these conditions are known to be associated with disturbances in the activity of RSN, and the present inventor has recognized that the present invention makes these conditions responsive to treatment with 5-MeO-DMT.

[0044] In another aspect, the present invention relates to the use of a therapeutically effective amount of 5-MeO-DMT in the treatment of psychiatric disorders, in particular major depressive disorder, persistent depressive disorder, anxiety disorders, post-traumatic stress disorder, body dysmorphic disorder, obsessive-compulsive disorder, eating disorders and psychoactive substance abuse, whereby a clinical response is rapidly achieved following administration of 5-MeO-DMT.

[0045] In another aspect, the present invention relates to the use of a therapeutically effective amount of 5-MeO-DMT in the treatment of psychiatric disorders, in particular major depressive disorder, persistent depressive disorder, anxiety disorders, post-traumatic stress disorder, body dysmorphic disorder, obsessive-compulsive disorder, eating disorders and psychoactive substance abuse, whereby a clinical response is sustained over an extended period following administration of 5-MeO-DMT.

[0046] In another aspect, the present invention relates to a new dosage regimen of 5-MeO-DMT for use in the treatment of psychiatric disorders, in particular major depressive disorder, persistent depressive disorder, anxiety disorder, post-traumatic stress disorder, body dysmorphic disorder, obsessive-compulsive disorder, eating disorder and psychoactive substance abuse, which allows a high percentage of patients and good reproducibility in the same patient to achieve peak experience.In addition to allowing a high peak experience rate and the resulting improved therapeutic effect, these new dosage regimens also simultaneously reduce the risk of overdosing, thereby improving safety profile.Such improved dosage regimens rely on applying increasing doses of 5-MeO-DMT to the same patient in subsequent administrations on the same or subsequent days.

[0047] Through each of these aspects, and particularly through combinations of these aspects, the present invention solves the problems of 1) providing improved psychoactive therapies based on the application of psychedelic drugs to patients with psychiatric disorders, and 2) identifying specific psychiatric disorders and specific subgroups of psychiatric disorders that are responsive to treatment with such improved therapies.

[0048] The fact that 5-MeO-DMT has an improved therapeutic effect despite the short duration of its acute psychedelic effect (e.g., 5-20 minutes after inhalation compared to several hours for oral psilocybin and oral LSD) is surprising, but in fact this short duration of action and the absence of associated tolerability (i.e., the absence of a decline or loss of psychedelic effect after re-administration) are the rationale for allowing novel dosing regimens with frequent re-administration (e.g., more than once a day, or even daily) designed to increase the incidence of peak experiences and thereby increase the therapeutic benefit. Repeated administration within such a short period of time also allows for intra-individual dose optimization reducing the risk of overdosing, which may otherwise result in less meaningful psychedelic experiences, such as serotonin syndrome, physical side effects such as negative psychological reactions such as flashbacks of the experience at a later time point, or reduced or absent memories of the altered state (so-called "whiteout"). Furthermore, by starting with a low dose, patients can generally become accustomed to the psychedelic experience and prepare for the more intense symptoms that occur at higher doses, which has a positive impact on these higher dose experiences. Additionally, the prospect of being able to initiate treatment at lower doses may encourage patient acceptance of the therapeutic approach and improve overall compliance rates at the patient population level.

[0049] Frequent re-administration of serotonergic psychedelic drugs to increase the peak experience rate and regulate the reproducibility of the peak experience, as well as to improve the therapeutic effect, reduce side effects, and improve compliance rates, is not contemplated in the prior art, and in fact re-administration may not be possible with currently tested dosing regimens for other psychedelic drugs due to the delayed onset and long duration of psychedelic effects observed with those current dosing regimens, and due to the rapid onset of tolerability (i.e., the decline or loss of psychedelic effect after re-administration), which may last for several days. The dosing regimens described so far for psychedelic drugs used in therapeutic situations contemplate either only a single administration or repeated administration after only a few days. Therefore, with these currently applied dosing regimens, peak experiences are not reliably achieved, and they do not provide the additional benefits mentioned above.

[0050] 5-MeO-DMT is a naturally occurring serotonergic psychedelic tryptamine that acts as a 5-HT1A and 5-HT2A receptor agonist. 5-MeO-DMT was first isolated from the bark of Dictyoloma incanescens, but is also found in other plants and has been identified as the major active component of the venom of the Colorado River toad (Bufo alvarius toad). In addition, 5-MeO-DMT is synthesized in the human pineal gland and retina and has been found in human body fluids including urine, blood and cerebrospinal fluid. 5-MeO-DMT is inactivated by a deamination pathway mediated primarily by monoamine oxidase A and O-demethylated by the cytochrome P450 2D6 (CYP2D6) enzyme to produce the active metabolite bufotenin. Bufotenin binds to the 5-HT2A receptor with much higher affinity than 5-MeO-DMT itself.

[0051] Compositions containing 5-MeO-DMT in addition to other active components have only been used in ritual or recreational situations (erowid.org / chemicals / 5meo_dmt / 5meo_dmt_dose.shtml and erowid.org / chemicals / 5meo_dmt / 5meo_dmt_effects.shtml, accessed March 1, 2018). A recent internet survey aimed at examining the use patterns, motivations, subjective effects and potential benefits, and outcomes associated with the use of compositions containing 5-MeO-DMT in addition to other active components described that the majority of respondents with self-reported psychological conditions, including anxiety, depression, substance use problems, and post-traumatic stress disorder, perceived improvement in symptoms related to these disorders (Davis AK et al., J Psychopharmacol. 2018 Jul;32(7):779-792). However, as described by the authors, "the study was cross-sectional, lacked validated measures of psychological symptoms and assessment of prior psychological treatment, and included many polysubstance users, thereby limiting causal inference of the relationship between 5-MeO-DMT use and symptom improvement; therefore the association of psychological benefit remains observational."

[0052] Application of 5-MeO-DMT in combination with MAO inhibitors results in enhanced and prolonged drug effects, but may also result in more toxicity. The most commonly described routes of administration of 5-MeO-DMT in ritual or recreational settings are inhalation of smoke or vapor or intranasal infusion, although other routes such as intravenous, rectal or oral application have also been described, with absorption via the latter route being limited by a substantial first-pass effect, likely due to the rapid action of MAO enzymes in the intestine and liver.

[0053] Advantageous Effects of the Invention The beneficial effects of the present invention compared to the current standard of care in each indication include, but are not limited to, a) a higher percentage of patients experiencing a clinical response, b) a higher average clinical response, c) a faster onset of clinical response, d) a more sustained clinical response, e) a comparable or better clinical response with fewer or different side effects, thereby improving compliance, and f) a comparable or better clinical response with a more convenient treatment regimen, including less drug administration, thereby improving compliance. Compared to previously studied psychedelic drugs, the present invention can further provide, for example, g) a comparable or better clinical response with a shorter duration of acute psychoactive effects after dosing, thereby improving convenience and compliance, h) an improved dosing regimen with a greater tendency to achieve a peak psychedelic experience and better reproducibility of the peak psychedelic experience, while avoiding unnecessary high doses and associated side effects, thus improving compliance. Furthermore, it is noted that the beneficial effects are particularly achieved in treatment-resistant patients as defined herein.

[0054] definition As used in the context of the present invention, unless otherwise stated, the term "5-MeO-DMT" refers to 5-MeO-DMT, which is a free base. It is contemplated that pharma- ceutically acceptable salts of 5-MeO-DMT may also be used. An example of such a salt is the hydrochloride salt. The appropriate weight of the salt to be administered may be calculated from the weight of the free base, assuming that an equimolar amount is used.

[0055] As used in the context of the present invention, a "patient" to be treated is a human subject who has been diagnosed with major depressive disorder by a qualified professional according to accepted medical practice. The diagnosis may be, for example, according to the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5) published by the American Psychiatric Association, of suffering from a mental disorder, in particular major depressive disorder, persistent depressive disorder, anxiety disorder, post-traumatic stress disorder, body dysmorphic disorder, obsessive-compulsive disorder, eating disorder or psychoactive substance abuse. The diagnosis is by a physician or psychologist. It is not sufficient for the human subject himself to consider himself to suffer from one of the disorders.

[0056] As used in the context of the present invention, "suicidal ideation" refers to thinking, thinking or planning to commit suicide. The presence of suicidal ideation in a patient is diagnosed by a doctor or psychologist using established protocols and methods for diagnosing suicidal tendencies. It is generally not enough for a patient to consider himself or herself as suffering from suicidal ideation. In some circumstances, a patient who experiences suicidal ideation is considered to be at imminent risk of committing suicide or to have "the intention to commit suicide".

[0057] As used in the context of the present invention, unless otherwise stated, the terms "treating" and "treatment" include the management and care of a patient for the purpose of combating a disease, condition or disorder and includes the administration of compounds and methods according to the present invention to alleviate the signs and / or symptoms or eliminate the disease, condition or disorder.

[0058] As used in the context of the present invention, unless otherwise stated, the term "therapeutically effective amount" means an amount of an active compound or pharmaceutical ingredient that elicits in humans the biological or clinical response sought by a researcher, medical doctor or other clinician, including alleviation of the signs and / or symptoms of the disease, condition or disorder being treated.

[0059] "Clinical response" includes, but is not limited to, improvement in a rating scale such as the Clinical Global Impression-Severity scale (CGI-S), Patient Global Impression-Severity scale (PGI-S), Clinical Global Impression-Improvement scale (CGI-I) or Patient Global Impression-Improvement scale (PGI-I), including, but not limited to, the Montgomery-Asberg Depression Rating Scale (MADRS) or the 17-item Hamilton Depression Rating Scale (HAM-D) for major depressive disorder and persistent depressive disorder, anxiety symptoms as measured by, for example, the Beck Anxiety Inventory (BAI), the Hamilton Anxiety Scale (HAM-A) or the State-Trait Anxiety Inventory (STAI) for anxiety disorders, the Post-Traumatic Stress Disorder Clinical Diagnostic Interview Scale (CAPS) for post-traumatic stress injury, the Yale-Brown Obsessive-Compulsive Disorder-Modified for Body Dysmorphic Disorder for body dysmorphic disorder, Further endpoints include the following: BDD-YBOCS for obsessive-compulsive disorder, the Yale-Brown Obsessive-Compulsive Disorder Scale (Y-BOCS) for obsessive-compulsive disorder, weight gain for anorexia nervosa, frequency of binge-eating and vomiting episodes for bulimia nervosa, frequency of binge-eating episodes for binge-eating disorder, duration of abstinence or reduction in substance use for psychoactive substance abuse, and for suicidal ideation, a suicidality rating scale such as the Columbia Suicide Severity Rating Scale (C-SSRS) or the suicidal thoughts item of the MADRS, or the Clinical Global Impression-Suicidality Severity-Revised (CGI-SS-R) scale (the CGI-SS-R is derived from the CGI-S and is scored as 0=normal, no suicidality at all, 1=suicidal, 2=mild, 3=moderate, 4=marked, 5=severe, 6=extreme suicidality). If clinical response is to be determined at an earlier time point after drug administration (e.g., 2 hours) based on endpoints developed for a longer recall period (e.g., typically 7 days for MADRS), rational modifications of such endpoints (e.g., changing the recall period for MADRS to 2 hours and carrying forward sleep items recorded at baseline before drug administration) may be applied.

[0060] As used in the context of the present invention, unless otherwise stated, the term "administration" (or "application") means the introduction of an active compound or pharmaceutical ingredient, which may be a predetermined amount, into a patient via any route. Preferably, the active compound is administered by inhalation, intranasally, by buccal administration, or by sublingual administration.

[0061] As used in the context of the present invention, unless otherwise stated, the terms "dose" and "dosage" and "dosage amount" refer to the amount of an active compound or pharmaceutical ingredient administered to a patient in an individual administration. The term "dosage regimen" (or "dosing regimen") refers to a predetermined sequence of one or more individual administrations.

[0062] As used herein, "aerosol" means a stable system consisting of a gaseous medium (a pharma- ceutical acceptable gas such as air) and tiny suspended solid and / or liquid particles.

[0063] The term "decomposition products" refers to compounds resulting from chemical modification of 5-MeO-DMT that occur as a result of chemical reactions during aerosol formation. Such reactions include, but are not limited to, oxidation.

[0064] When the percentage of "degradation products" is described in the context of the present invention, it refers to the amount of 5-MeO-DMT degradation products present in a sample divided by the sum of the amounts of 5-MeO-DMT and 5-MeO-DMT degradation products present in the sample, multiplied by 100%, i.e., (the sum of the amounts of all 5-MeO-DMT degradation products present in the sample) / ((the amount of 5-MeO-DMT present in the sample)+(the sum of the amounts of all 5-MeO-DMT degradation products present in the sample))×100%.

[0065] As used herein, the term "impurities" refers to undesired compounds that contaminate a sample of 5-MeO-DMT (or a pharma- ceutically acceptable salt thereof). Impurities may be contained in the starting material prior to aerosol formation or may be degradation products.

[0066] The term "purity" refers to the percentage of all 5-MeO-DMT degradation products and all other impurities present minus 100%, i.e., (100% - (the sum of the amounts of all 5-MeO-DMT degradation products present + the sum of the amounts of all other impurities present) / (the amount of 5-MeO-DMT present + the sum of the amounts of all 5-MeO-DMT degradation products present + the sum of the amounts of all other impurities present) x 100%.

[0067] The term "mass median aerodynamic diameter" (MMAD) is the diameter at which 50% of the particles present in an aerosol are larger and 50% are smaller than this calculated diameter.

[0068] The term "mass density of aerosol particles" refers to the mass of aerosol particles per unit volume of aerosol.

[0069] The term "rate of formation of aerosol particles" refers to the mass of aerosolized 5-MeO-DMT per unit of aerosolization time.

[0070] Aspects of the invention The present invention is directed to an improved method for the treatment of psychiatric disorders, in particular major depressive disorder, persistent depressive disorder, anxiety disorder, post-traumatic stress disorder, body dysmorphic disorder, obsessive-compulsive disorder, eating disorder and psychoactive substance abuse, comprising administering a therapeutically effective amount of 5-MeO-DMT or a pharmaceutically acceptable salt thereof to a patient as defined herein.The treatment of these disorders includes, but is not limited to, the use of 5-MeO-DMT or a pharmaceutically acceptable salt thereof in a patient as defined herein with such disorders and suicidal ideation.The treatment of these disorders includes, in particular, the use of 5-MeO-DMT or a pharmaceutically acceptable salt thereof in a patient as defined herein with treatment-resistant type of the mentioned disorders. In the context of the present invention, "treatment resistance" is defined as no adequate improvement in major depressive disorder and persistent depressive disorder after at least two adequate courses of pharmacological treatment in the current depressive episode, no adequate improvement in anxiety disorder, post-traumatic stress disorder, body dysmorphic disorder and obsessive-compulsive disorder after at least one adequate course of pharmacological treatment and at least one adequate course of psychotherapy, and no adequate improvement after at least one adequate course of psychotherapy with or without pharmacological treatment in eating disorder and psychoactive substance abuse. Adequacy of improvement is judged in terms of clinical response, and adequacy of treatment course is judged in terms of regimen, dose, duration and compliance. Adequacy is judged and recorded by a physician or psychologist using a set of predefined criteria, and it is not sufficient for the patient to consider that the past treatment course was not appropriate or that he or she did not respond adequately. Adequacy may be judged retrospectively and prospectively.

[0071] The treatment of patients with anxiety disorders includes but is not limited to patients with panic disorder, phobic anxiety disorder, social anxiety disorder and generalized anxiety disorder.The treatment of patients with eating disorders includes but is not limited to anorexia nervosa, bulimia nervosa and binge eating disorder.The treatment of patients with substance abuse includes but is not limited to patients with alcohol-related disorder, opioid-related disorder, sedative, hypnotic or anxiolytic-related disorder, cocaine-related disorder, other stimulant-related disorder and nicotine dependence.

[0072] The disorders preferably treated by the present invention are major depressive disorder, including its treatment-resistant forms, generalized anxiety disorder, obsessive-compulsive disorder and anorexia nervosa. The disorder most preferably treated by the present invention is major depressive disorder, including its treatment-resistant forms, and also includes patients with major depressive disorder who have suicidal ideation.

[0073] In embodiments, the dosage of 5-MeO-DMT administered to a patient as defined herein having a psychiatric disorder, particularly major depressive disorder, persistent depressive disorder, anxiety disorder, post-traumatic stress disorder, body dysmorphic disorder, obsessive-compulsive disorder, eating disorder, and psychoactive substance abuse, such as those disorders of the treatment-resistant type, and those disorders associated with suicidal ideation, is in the range of about 1 mg to about 25 mg, or any amount within a range therein, preferably about 2 mg to about 20 mg, more preferably about 4 mg to about 20 mg. Particular amounts useful are, for example, about 4 mg, about 6 mg, about 8 mg, about 10 mg, about 12 mg, about 14 mg, about 16 mg, about 18 mg, and about 20 mg. The patient may be treated with an equimolar dose of a pharma- ceutically acceptable salt of 5-MeO-DMT. In this specification, when ranges such as "about 1 mg to about 25 mg" are stated, the inventors note that all individual values ​​within the range are contemplated, although some of them are specifically mentioned, and not all of them are mentioned merely for the sake of brevity.

[0074] In a preferred embodiment, the improved method for treating a patient as defined herein having a psychiatric disorder, in particular major depressive disorder, persistent depressive disorder, anxiety disorder, post-traumatic stress disorder, body dysmorphic disorder, obsessive-compulsive disorder, eating disorders and psychoactive substance abuse, including treatment-resistant types of these disorders and including those disorders associated with suicidal ideation, with a therapeutically effective amount of 5-MeO-DMT comprises the occurrence of a clinical response within about 2 hours after administration of 5-MeO-DMT.

[0075] In a preferred embodiment, the improved method for treating a patient as defined herein having a psychiatric disorder, in particular major depressive disorder, persistent depressive disorder, anxiety disorder, post-traumatic stress disorder, body dysmorphic disorder, obsessive-compulsive disorder, eating disorder and psychoactive substance abuse, such as those disorders of the treatment-resistant type and those disorders associated with suicidal ideation, with a therapeutically effective amount of 5-MeO-DMT includes a clinical response occurring within about 2 hours after administration of 5-MeO-DMT and a sustained clinical response until at least about 6 days after the last administration of 5-MeO-DMT, preferably until at least about 14 days after the last administration of 5-MeO-DMT, and more preferably until at least about 28 days after the last administration of 5-MeO-DMT.

[0076] In a preferred embodiment, the improved method for treating patients as defined herein having psychiatric disorders, in particular major depressive disorder, persistent depressive disorder, anxiety disorder, post-traumatic stress disorder, body dysmorphic disorder, obsessive-compulsive disorder, eating disorders and psychoactive substance abuse, such as those disorders of the treatment-resistant type and those disorders associated with suicidal ideation, with a therapeutically effective amount of 5-MeO-DMT comprises the administration of more than a single dose of 5-MeO-DMT.

[0077] In a preferred embodiment, this greater than single dose of 5-MeO-DMT is administered to the patient in one or more treatment blocks, each block consisting of 2-7 administrations, with at least about 1 hour and no more than about 24 hours between each administration within each treatment block, and with at least about 6 days between the end of one treatment block and the start of the next treatment block.

[0078] In an even more preferred embodiment, this greater than single dose of 5-MeO-DMT is administered to the patient in one or more treatment blocks, each block consisting of 1 to 3 administrations, with about 24 hours between each administration within each treatment block, and with about 6 days or more between the end of one treatment block and the start of the next treatment block.

[0079] In a most preferred embodiment, this greater than single dose of 5-MeO-DMT is administered to the patient in one or more treatment blocks, each block consisting of 1-3 administrations, with about 2-4 hours between each administration within each treatment block, and with about 6 days or more between the end of one treatment block and the start of the next treatment block.

[0080] In embodiments, the dosage of 5-MeO-DMT administered to an individual patient in each administration and each treatment block is constant for the individual patient and is selected from about 1 mg to about 25 mg, preferably about 2 mg to about 20 mg, more preferably about 4 mg to about 20 mg. Useful specific amounts are, for example, about 4 mg, about 6 mg, about 8 mg, about 10 mg, about 12 mg, about 14 mg, about 16 mg, about 18 mg, and about 20 mg.

[0081] In a preferred embodiment, the dosage of 5-MeO-DMT administered to an individual patient is selected from about 2 mg to about 8 mg for the first administration within each treatment block, and then increases with each subsequent administration within each treatment block until 20 mg is reached or all administrations within that treatment block have been administered, whichever occurs first.

[0082] In an even more preferred embodiment, the dosage of 5-MeO-DMT administered to an individual patient is selected from about 2 mg to about 8 mg for the first administration within each treatment block, and thereafter increases with each subsequent administration within each treatment block until 20 mg is reached, or all administrations within that treatment block have been administered, or the patient experiences a peak psychedelic experience, or the supervising physician determines, based on observed side effects, that further dose increases are inappropriate, whichever occurs first.

[0083] In embodiments where the dosage is increased with each subsequent administration, the dosage of the next administration is determined by adding about 2 mg to about 10 mg, preferably about 4 mg to about 8 mg, and most preferably about 6 mg to the dosage of the previous administration. For example, if the dosage of the first administration is 6 mg and the dosage increase is 6 mg, the dosage of the second administration is 12 mg unless one of the discontinuation criteria described above is reached. Preferably, the dosage of the third administration is 18 mg.

[0084] In a preferred embodiment, the dosage of 5-MeO-DMT administered to an individual patient in each treatment block is selected from about 2 mg to about 8 mg for a first administration, and then increased to a dosage selected from about 8 mg to about 14 mg for a second administration, and to a dosage selected from about 14 mg to about 20 mg for a third administration, unless the patient has already experienced a peak psychedelic experience within that treatment block or the supervising physician has determined that further dose increases are inappropriate based on observed side effects. Particular useful amounts for the first, second and third administrations are, for example, about 6 mg, about 12 mg and about 18 mg.

[0085] In an even more preferred embodiment, the dosage of 5-MeO-DMT administered to an individual patient is selected from about 2 mg to about 8 mg for the first administration in a first treatment block, and thereafter increases with each subsequent administration in the first treatment block until 20 mg is reached, or all administrations in that treatment block have been administered, or the patient experiences a peak psychedelic experience, or the supervising physician determines that further dose increases are inappropriate based on observed side effects, whichever occurs first, and the maximum dosage in that first treatment block is used as the dosage for administrations in all subsequent treatment blocks and those subsequent treatment blocks. For example, if the maximum dosage in a first treatment block was 18 mg because the patient experienced a peak psychedelic experience at that dose, then the dosage for administrations in all subsequent treatment blocks and those subsequent treatment blocks is 18 mg.

[0086] In a most preferred embodiment, the dosage of 5-MeO-DMT administered to an individual patient is selected from about 2 mg to about 8 mg for the first administration in a first treatment block, and then increased to a dosage selected from about 8 mg to about 14 mg for the second administration in the first treatment block, and to a dosage selected from about 14 mg to about 20 mg for the third administration in the first treatment block, unless the patient has already experienced a peak psychedelic experience within that treatment block or the supervising physician has determined that further dose increases are inappropriate based on observed side effects, with the maximum dosage in that first treatment block being used as the dosage for all subsequent treatment blocks and administrations within those subsequent treatment blocks. Useful specific amounts for the first, second and third administrations in a first treatment block are, for example, about 6 mg, about 12 mg and about 18 mg.

[0087] It will be understood that pharma- ceutically acceptable salts of 5-MeO-DMT may also be used in all of the above dosing regimens, and the appropriate weight of the salt to be administered may be calculated from the stated weight of the free base, assuming that an equimolar amount is used.

[0088] According to the present invention, 5-MeO-DMT is preferably not administered in combination with an MAO inhibitor.

[0089] The occurrence of a "peak psychedelic experience" in a patient can be identified by achievement of at least 60% of the highest possible score on each of the four subscales (mystical, positive mood, transcendence in time and space, and indescribable) of the 30-item Revised Mystical Experiences Questionnaire (MEQ30) (as described in Barrett FS, J Psychopharmacol. 2015;29(11):1182-90, with score items shown in Example 4).

[0090] The occurrence of a "peak psychedelic experience" in a patient may also be identified by achievement of at least 60% of the highest possible score on the Oceanic Feeling (OBN) facet of the Altered States of Consciousness (ASC) questionnaire (as described in Roseman L et al., Front Pharmacol. 2018; 8:974).

[0091] The occurrence of a "peak psychedelic experience" in a patient may also be identified by achieving a score of at least 75 on the Peak Psychedelic Experience Questionnaire (PPEQ) total score, which is the average of responses scored by the patient from 0 to 100 to the following three questions: 1. How powerful was the experience?, 2. To what extent did I lose control?, and 3. How profound (i.e., deep and remarkable) was the experience?

[0092] The therapeutically effective amount of 5-MeO-DMT is administered by inhalation, nasal administration, buccal administration, or sublingual administration. Administration via these routes can ensure a rapid onset of action. The most preferred route of administration is administration by inhalation. Preferably, the therapeutically effective amount of 5-MeO-DMT is inhaled in one breath.

[0093] For nasal administration, 5-MeO-DMT may be used as a neat substance or in the form of a formulation for nasal administration, examples of which are known in the art.For nasal administration, 5-MeO-DMT may be used as a pharmaceutically acceptable salt or in the form of a formulation of a pharmaceutically acceptable salt.Examples of suitable devices are known in the art.

[0094] For buccal or sublingual administration, 5-MeO-DMT may be utilized per se or in the form of a formulation, such as a tablet, film, spray, cream, examples of which are known in the art, and for buccal or sublingual administration, a pharma- ceutically acceptable salt of 5-MeO-DMT may be utilized per se or in the form of a formulation, such as a tablet, film, spray, cream, examples of which are generally known in the art.

[0095] The administration is particularly by inhalation of an aerosol. Such an aerosol comprises (a) a pharma- ceutically acceptable gas, (b) aerosol particles of 5-methoxy-N,N-dimethyltryptamine (5-MeO-DMT) or a pharma- ceutically acceptable salt thereof, the aerosol having a mass density of the aerosol particles of about 0.5 mg / l to about 12.5 mg / l, preferably about 1.3 mg / l to about 10 mg / l, in particular about 2 mg / l to about 9 mg / l. The pharma- ceutically acceptable gas is preferably air.

[0096] The aerosol particles preferably contain less than 1 wt.% of impurities, in particular less than 0.5 wt.% of impurities. They further preferably contain less than 0.5 wt.% of 5-MeO-DMT degradation products, in particular less than 0.2 wt.% of 5-MeO-DMT degradation products resulting from chemical modification of 5-MeO-DMT as a result of chemical reactions during the formation of the aerosol.

[0097] In a further preferred embodiment, the aerosol consists essentially of (a) air, and (b) aerosol particles of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof.

[0098] The aerosol particles preferably contain 5-MeO-DMT in the free base form.

[0099] The aerosol is preferably characterized by a mass median aerodynamic diameter of less than 3 microns and greater than 0.1 microns, especially less than 2 microns and greater than 0.1 microns.

[0100] The aerosol may be formed by a) exposing a thin layer of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof formed on a solid support to thermal energy, and b) passing air over the thin layer of 5-MeO-DMT to create aerosol particles. The thin layer may have a thickness of less than about 10 μm, particularly less than about 7.5 μm. The thin layer may have a thickness in the range of about 0.1 μm to about 10 μm, particularly in the range of about 0.3 μm to about 7.5 μm.

[0101] A thin layer of 5-MeO-DMT formed on a solid support may be exposed to thermal energy via air passing over the thin layer. Alternatively, a thin layer of 5-MeO-DMT formed on a solid support may be exposed to thermal energy via the solid support.

[0102] The air passing over the layer may have a temperature in the range of about 180° C. to about 260° C. The air passing over the layer may in particular have a temperature of about 210° C. and may pass over the layer at a rate of about 12 L / min for a duration of about 15 seconds.

[0103] The aerosol particles may be contained in a volume of about 3 liters or less, particularly about 2 to about 3 liters. The aerosol is particularly for use in therapy. The aerosol is preferably delivered to the patient by a single inhalation.

[0104] The present invention aims to provide 5-MeO-DMT or a pharma- ceutically acceptable salt thereof in a form suitable for inhalation in a medical setting. The present invention particularly provides 5-MeO-DMT and a pharma-ceutically acceptable salt thereof in the form of aerosols. These aerosols have a suitable mass density of the aerosol particles to allow a therapeutically effective dose of the aerosol to be administered to a patient by a single inhalation.

[0105] The aerosol useful in the present invention can be formed using thermal energy.When using thermal energy to form aerosol of a compound, it is very difficult to predict which conditions are suitable for safe, efficient and predictable aerosolization, especially when the aerosol is used for systemic delivery of the compound to the patient via the lungs.In this context, the relevant variables include: a) the dose of the compound, b) the morphological state in which the compound is made available for aerosolization (e.g., crystalline form or thin layer form), c) the amount of thermal energy that the compound is exposed to (defined by the temperature and duration of exposure), and d) the volume of air that is introduced to generate aerosol (defined by the flow rate and duration of air flow).

[0106] The present invention aims to provide compositions and methods for safe, efficient and predictable systemic delivery of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof to a patient by inhalation. "Safe" means that the aerosol particles should contain only small amounts of impurities and 5-MeO-DMT degradation products; "efficient" means that the dose is aerosolized to a predefined extent, and preferably nearly completely or completely, that the aerosol has desirable physical properties for systemic delivery of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof via the lungs, primarily by absorption in the alveoli, and that the aerosol is inhalable by the patient in a single inhalation (i.e., within one deep breath); and "predictable" means that there should be little or no variation in the amount of degradation products, the degree of aerosolization, and the physical properties of the aerosol.

[0107] A suitable aerosol may be achieved by a) providing a therapeutically effective amount of 5-MeO-DMT as a thin layer on a solid support, b) exposing the thin layer of 5-MeO-DMT to a controlled elevated temperature for a short duration, and c) providing a controlled amount of air such that an aerosol is formed.

[0108] A composition for delivery of a therapeutically effective amount of 5-MeO-DMT may include an aerosol formed by a) exposing a thin layer of 5-MeO-DMT configured on a solid support to thermal energy, and b) passing air over the thin layer of 5-MeO-DMT, said aerosol having one or more of the following characteristics: 1) containing aerosol particles characterized by a mass median aerodynamic diameter of less than 3 microns, 2) containing aerosol particles characterized by less than 1 wt% impurities and less than 0.5% 5-MeO-DMT degradation products, and 3) capable of being delivered to a patient by a single inhalation.

[0109] The generation of aerosol particles characterized by a mass median aerodynamic diameter of less than 3 microns, with less than 1 wt% impurities and less than 0.5% 5-MeO-DMT drug degradation products in the volume of aerosol that can be delivered to a patient by a single inhalation is achieved by defining a) the dosage of 5-MeO-DMT contained in the thin layer of 5-MeO-DMT, b) the thickness of the thin layer of 5-MeO-DMT, c) the thermal energy to which the thin layer of 5-MeO-DMT is exposed (defined by the temperature and duration of exposure), and d) the total amount of air passed over the thin layer of 5-MeO-DMT (defined by the air flow rate and duration of the air flow).

[0110] Preferably, the thin layer of 5-MeO-DMT is exposed to thermal energy via air passing over the thin layer, where the air is heated. The heated air passing over the thin layer may have a temperature in the range of about 180° C. to about 260° C. The air passing over the thin layer may in particular have a temperature of about 210° C.

[0111] Alternatively, the thin layer of 5-MeO-DMT is exposed to thermal energy through the solid support, in which case the air passing over the thin layer is not heated, but the solid support is heated. The heated solid support may have a temperature in the range of about 180° C. to about 420° C.

[0112] Preferably, the 5-MeO-DMT used to form the thin layer on the solid support is highly pure, having a purity of at least 99%, preferably at least 99.5%.

[0113] Preferably, the dosage of 5-MeO-DMT contained in the thin layer of 5-MeO-DMT formed on the solid support is about 1 mg to about 25 mg, preferably about 2 mg to about 20 mg, more preferably about 4 mg to about 20 mg. Useful specific amounts are, for example, about 4 mg, about 6 mg, about 8 mg, about 10 mg, about 12 mg, about 14 mg, about 16 mg, about 18 mg, and about 20 mg. Preferred specific amounts are, for example, about 6 mg, about 12 mg, and about 18 mg.

[0114] The solid support on which 5-MeO-DMT or its pharma-ceutically acceptable salt is provided may have various shapes. Examples of such shapes include, but are not limited to, cylinders with diameters of less than 1.0 mm, boxes with thicknesses of less than 1.0 mm, and virtually any shape permeated by small (e.g., less than 1.0 mm in size) holes. Preferably, the solid support provides a large surface-to-volume ratio (e.g., greater than 100 per meter) and a large surface-to-mass ratio (e.g., greater than 1 cm2 per gram).

[0115] A solid support of one shape can also be transformed into another shape with different properties. For example, a planar sheet of 0.25 mm thickness has a surface-to-volume ratio of approximately 8,000 per meter. Rolling the sheet into a hollow cylinder of 1 cm diameter creates a support that retains the high surface-to-mass ratio of the original sheet, but has a lower surface-to-volume ratio (about 400 per meter).

[0116] Many different materials are used to construct solid supports. Such classes of materials include, without limitation, metals, inorganic materials, carbon materials, and polymers. The following are examples of classes of materials: aluminum, silver, gold, stainless steel, copper, and tungsten; silica, glass, silicon, and alumina; graphite, porous carbon, carbon yarn, and carbon felt; polytetrafluoroethylene and polyethylene glycol. Combinations of materials and coated versions of materials are also used.

[0117] When aluminum is used as the solid support, aluminum foil is a suitable material.Examples of silica, alumina and silicon-based materials include amorphous silica S-5631 (Sigma, St. Louis, Missouri), BCR171 (alumina with a specified surface area of ​​more than 2 m2 / g, manufactured by Aldrich, St. Louis, Missouri) and silicon wafers used in the semiconductor industry.Carbon yarn and carbon felt are available from American Kynol, Inc., New York, New York.

[0118] Preferably, the thickness of the thin layer of 5-MeO-DMT formed on the solid support is less than about 10 μm, in particular less than about 7.5 μm. The thin layer may have a thickness in the range of about 0.1 μm to about 10 μm, in particular in the range of 0.3 μm to 7.5 μm.

[0119] Preferably, the total amount of air passing over the thin layer of 5-MeO-DMT is defined by a flow rate between about 6 liters per minute and about 40 liters per minute, preferably between about 8 liters per minute and about 16 liters per minute, and a duration of air flow selected such that the total volume of aerosol does not exceed about 3 liters, preferably between about 2 liters and 3 liters. For example, at an air flow rate of about 6 liters per minute, the duration of air flow should be less than about 30 seconds. A useful specific air flow rate and duration is about 12 liters per minute and about 15 seconds, which results in an aerosol volume of about 3 liters. Another useful specific air flow rate and duration is about 10 liters per minute and about 15 seconds, which results in an aerosol volume of about 2.5 liters. Another useful specific air flow rate and duration is about 8 liters per minute and about 15 seconds, which results in an aerosol volume of about 2 liters. Another useful specific air flow rate and duration is 10 liters per minute and about 12 seconds, which results in an aerosol volume of about 2 liters.

[0120] The rate of aerosol formation is greater than 0.1 mg / sec.

[0121] The aerosol has a mass density of the aerosol particles of about 0.5 mg / l to about 12.5 mg / l, preferably about 1.3 mg / l to about 10 mg / l, in particular about 2 mg / l to about 9 mg / l.

[0122] The 5-MeO-DMT aerosol particles are characterized by a mass median aerodynamic diameter of less than 3 microns and greater than 0.1 microns, preferably less than 2.5 microns and greater than 0.1 microns, and most preferably less than 2 microns and greater than 0.1 microns.

[0123] The 5-MeO-DMT aerosol particles are characterized by less than 1 wt% impurities, preferably less than 0.5 wt% impurities. The 5-MeO-DMT aerosol particles are characterized by less than 0.5 wt% 5-MeO-DMT degradation products, preferably less than 0.2 wt% 5-MeO-DMT degradation products.

[0124] A composition for delivery of a therapeutically effective amount of 5-MeO-DMT may comprise an aerosol, the aerosol being formed by a) exposing a dosage of 12 mg of 5-MeO-DMT configured as a thin layer less than 5 microns thick on a solid support to a temperature of 210° C. by passing heated air over the thin layer for a duration of 15 seconds, said aerosol having one or more of the following characteristics: 1) containing aerosol particles characterized by a mass median aerodynamic diameter of less than 3 microns, 2) containing aerosol particles characterized by less than 1% impurities and less than 0.5 wt% 5-MeO-DMT degradation products, and 3) being capable of being delivered to a patient by a single inhalation.

[0125] Those skilled in the art who are familiar with the aerosol characteristics and aerosolization conditions defined in the present invention can identify suitable vaporization device or system that produces the required aerosol characteristics.Examples of such suitable vaporization device or system include, for example, Volcano Medic Vaporization System (Storz&Bickel, Germany; disclosed in, for example, EP 0933093 and EP 1884254 and Community Registered Design 003387299-0001) with the associated medication capsule with drip pad and Staccato device (Alexza Pharmaceuticals, Mountain View, USA; disclosed in, for example, US Patent 7,458,374, US Patent 9,370,629 and US Patent 9,687,487).

[0126] The aerosol generated is collected in a balloon from which it may be inhaled by the patient.

[0127] Patients may also undergo psychotherapeutic intervention.

[0128] In a particular embodiment, the disease to be treated is major depressive disorder. In this same particular embodiment, the patient may suffer from treatment-resistant major depressive disorder. In this same particular embodiment, the patient may also suffer from suicidal ideation with the intent to carry out and may be considered to be at imminent risk of suicide. In this same particular embodiment, the dosage of 5-MeO-DMT administered to a patient, as defined herein, having major depressive disorder ranges from about 4 mg to about 20 mg and is administered by inhalation. Useful particular amounts of 5-MeO-DMT in this particular embodiment are, for example, about 4 mg, about 6 mg, about 8 mg, about 10 mg, about 12 mg, about 14 mg, about 16 mg, about 18 mg and about 20 mg. The patient may also be treated with an equimolar dose of a pharma- ceutically acceptable salt of 5-MeO-DMT.

[0129] In a particular embodiment, the disease to be treated is major depressive disorder. In this same particular embodiment, the patient may suffer from treatment-resistant major depressive disorder. In this same particular embodiment, the patient may also suffer from suicidal ideation with the intention to carry out and may be considered to be at imminent risk of suicide. In this same particular embodiment, the dosage of 5-MeO-DMT administered to a patient as defined herein having major depressive disorder ranges from about 4 mg to about 20 mg and is administered by inhalation. Useful particular amounts of 5-MeO-DMT in this particular embodiment are, for example, about 4 mg, about 6 mg, about 8 mg, about 10 mg, about 12 mg, about 14 mg, about 16 mg, about 18 mg and about 20 mg. In this same particular embodiment, the clinical response as determined by at least a 50% improvement in the MADRS or HAM-D score, or a score of at least a "marked improvement" in the CGI-I or PGI-I score compared to the respective scores prior to administration of 5-MeO-DMT, occurs within about 2 hours after administration of 5-MeO-DMT.

[0130] In a particular embodiment, the disease to be treated is major depressive disorder. In this same particular embodiment, the patient may suffer from treatment-resistant major depressive disorder. In this same particular embodiment, the patient may also suffer from suicidal ideation with the intention to carry out and may be considered to be at imminent risk of suicide. In this same particular embodiment, the dosage of 5-MeO-DMT administered to a patient as defined herein having major depressive disorder ranges from about 4 mg to about 20 mg and is administered by inhalation. Useful specific amounts of 5-MeO-DMT in this particular embodiment are, for example, about 4 mg, about 6 mg, about 8 mg, about 10 mg, about 12 mg, about 14 mg, about 16 mg, about 18 mg and about 20 mg. In this same particular embodiment, remission of depressive symptoms as determined by a MADRS score of 10 or less or a HAM-D score of 7 or less occurs within about 2 hours after administration of 5-MeO-DMT.

[0131] In a particular embodiment, the disease to be treated is major depressive disorder. In this same particular embodiment, the patient may suffer from treatment-resistant major depressive disorder. In this same particular embodiment, the patient may also suffer from suicidal ideation with the intention to carry out and may be considered to be at imminent risk of suicide. In this same particular embodiment, the dosage of 5-MeO-DMT administered to a patient as defined herein having major depressive disorder ranges from about 4 mg to about 20 mg and is administered by inhalation. Useful particular amounts of 5-MeO-DMT in this particular embodiment are, for example, about 4 mg, about 6 mg, about 8 mg, about 10 mg, about 12 mg, about 14 mg, about 16 mg, about 18 mg and about 20 mg. In this same particular embodiment, the clinical response, such as a clinical response occurring within about 2 hours after administration of 5-MeO-DMT, as determined by at least a 50% improvement in the MADRS or HAM-D score compared to the respective scores prior to administration of 5-MeO-DMT, or as a score of at least a "marked improvement" in the CGI-I or PGI-I score, persists until at least about 6 days after the last administration of 5-MeO-DMT, preferably until at least about 14 days after the last administration of 5-MeO-DMT, and more preferably until at least about 28 days after the last administration of 5-MeO-DMT.

[0132] In a particular embodiment, the disease being treated is major depressive disorder. In this same particular embodiment, the dosage of 5-MeO-DMT administered to an individual patient is selected from about 2 mg to about 8 mg for the first administration of the first treatment block, and then increased to a dosage selected from about 8 mg to about 14 mg for the second administration of the first treatment block, and to a dosage selected from about 14 mg to about 20 mg for the third administration of the first treatment block, unless the patient has already experienced a peak psychedelic experience within that treatment block or unless the supervising physician has determined that further dose increases are inappropriate based on observed side effects, with the maximum dosage in that first treatment block being used as the dosage for all subsequent treatment blocks and administrations within those subsequent treatment blocks. Useful particular amounts for the first, second and third administrations in the first treatment block are, for example, about 6 mg, about 12 mg and about 18 mg. In this same particular embodiment, the interval between each administration within the first treatment block is about 3 hours. In this same specific embodiment, 5-MeO-DMT is administered by inhalation. In this same specific embodiment, the occurrence of a peak psychedelic experience is identified by achieving at least 60% of the highest possible score on each of the four subscales (mystical, positive mood, transcendence of time and space, and ineffability) of the 30-item Revised Mystical Experiences Questionnaire (MEQ30) (as described in Barrett FS, J Psychopharmacol. 2015;29(11):1182-90), or by achieving a Peak Psychedelic Experiences Questionnaire (PPEQ) total score of at least 75.

[0133] In a further specific embodiment, the disease being treated is major depressive disorder. In this same specific embodiment, the dosage of 5-MeO-DMT administered to an individual patient in each treatment block is selected from about 2 mg to about 8 mg for the first administration, and then increased to a dosage selected from about 8 mg to about 14 mg for the second administration, and to a dosage selected from about 14 mg to about 20 mg for the third administration, unless the patient has already experienced a peak psychedelic experience within that treatment block or unless the supervising physician has determined that further dose increases are inappropriate based on observed side effects. Useful specific amounts for the first, second and third administrations in the first treatment block are, for example, about 6 mg, about 12 mg and about 18 mg. In this same specific embodiment, the interval between each administration within each treatment block is about 3 hours, and the interval between the end of one treatment block and the start of the next treatment block is about 6 days. In this same specific embodiment, the 5-MeO-DMT is administered by inhalation. In this same particular embodiment, the occurrence of a peak psychedelic experience is identified by achievement of at least 60% of the highest possible score on each of the four subscales (mystical, positive mood, transcendence in time and space, and indescribable) of the 30-item Revised Mystical Experiences Questionnaire (MEQ30) (as described in Barrett FS, J Psychopharmacol. 2015;29(11):1182-90), or achievement of a Peak Psychedelic Experiences Questionnaire (PPEQ) total score of at least 75.

[0134] In a particular embodiment, the disease being treated is treatment-resistant major depressive disorder. In this same particular embodiment, the patient may suffer from suicidal ideation with the intent to carry out and may be considered to be at imminent risk of suicide. In this same particular embodiment, the dosage of 5-MeO-DMT administered to an individual patient is selected from about 2 mg to about 8 mg for the first administration of the first treatment block, and then increased to a dosage selected from about 8 mg to about 14 mg for the second administration of the first treatment block, and to a dosage selected from about 14 mg to about 20 mg for the third administration of the first treatment block, unless the patient has already experienced a peak psychedelic experience within that treatment block or unless the supervising physician has determined that further dose increases are inappropriate based on observed side effects, with the maximum dosage in that first treatment block being used as the dosage for all subsequent treatment blocks and administrations within those subsequent treatment blocks. Useful particular amounts for the first, second and third administrations in the first treatment block are, for example, about 6 mg, about 12 mg and about 18 mg. In this same specific embodiment, the interval between each administration in the first treatment block is about 3 hours.In this same specific embodiment, 5-MeO-DMT is administered by inhalation.In this same specific embodiment, the occurrence of peak psychedelic experience is identified by achieving at least 60% of the highest possible score in each of the four subscales (mystical, positive mood, transcending time and space and ineffability) of the 30-item revised mystical experience questionnaire (MEQ30) (as described in Barrett FS, J Psychopharmacol. 2015;29(11):1182-90), or by achieving a total score of at least 75 on the peak psychedelic experience questionnaire (PPEQ).

[0135] In a further specific embodiment, the disease being treated is treatment-resistant major depressive disorder. In this same specific embodiment, the dosage of 5-MeO-DMT administered to an individual patient in each treatment block is selected from about 2 mg to about 8 mg for the first administration, and then increased to a dosage selected from about 8 mg to about 14 mg for the second administration, and to a dosage selected from about 14 mg to about 20 mg for the third administration, unless the patient has already experienced a peak psychedelic experience within that treatment block or unless the supervising physician has determined that further dose increases are inappropriate based on observed side effects. Useful specific amounts for the first, second and third administrations in the first treatment block are, for example, about 6 mg, about 12 mg and about 18 mg. In this same specific embodiment, the interval between each administration within each treatment block is about 3 hours, and the interval between the end of one treatment block and the start of the next treatment block is about 6 days. In this same specific embodiment, the 5-MeO-DMT is administered by inhalation. In this same particular embodiment, the occurrence of a peak psychedelic experience is identified by achievement of at least 60% of the highest possible score on each of the four subscales (mystical, positive mood, transcendence in time and space, and indescribable) of the 30-item Revised Mystical Experiences Questionnaire (MEQ30) (as described in Barrett FS, J Psychopharmacol. 2015;29(11):1182-90), or achievement of a Peak Psychedelic Experiences Questionnaire (PPEQ) total score of at least 75.

[0136] Embodiment Specific embodiments of the present invention are listed below.

[0137] It is recognized that the present invention further encompasses all methods of treatment defined in the embodiments and claims described herein by replacing phrases such as "5-methoxy-N,N-dimethyltryptamine (5MeO-DMT) or a pharma- ceutically acceptable salt thereof for use in treating a patient" with "a method of treating a patient by administering 5-methoxy-N,N-dimethyltryptamine (5MeO-DMT) or a pharma- ceutically acceptable salt thereof."

[0138] It is emphasized that embodiments and claims that recite a clinical response a) occurring within a particular time point, b) sustaining at least until a particular time point, or c) being present at a particular time point "after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof" include, through dependency of other embodiments and claims, for example, those in which a) the "last administration" is in fact the first administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof, and b) the "last administration" is in fact the administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof at which the patient experienced a peak psychedelic experience, which may be the first administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof, but may also be a subsequent administration of a higher dose of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof than the first administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof.

[0139] Embodiments Relating to Treatment of Major Depressive Disorder 1. 5-Methoxy-N,N-dimethyltryptamine (5-MeO-DMT) or a pharma- ceutically acceptable salt thereof, for use in the treatment of patients diagnosed with major depressive disorder by a qualified professional in accordance with accepted medical practice. 2. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use as described in embodiment 1, wherein the disorder is diagnosed in accordance with the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5) published by the American Psychiatric Association. 3. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 1 or 2, wherein the patient suffers from moderate or severe major depressive disorder as indicated by a Montgomery-Asberg Depression Rating Scale (MADRS) score of 20 or greater, or a 17-item Hamilton Depression Rating Scale (HAM-D) score of 17 or greater. 4. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 3, wherein the patient suffers from severe major depressive disorder as indicated by a MADRS score of 35 or greater, or a HAM-D score of 25 or greater. 5. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-4, wherein the patient is diagnosed with treatment-resistant major depressive disorder. 6. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 5, wherein the patient further suffers from suicidal thoughts. 7. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 6, wherein the patient suffers from suicidal thoughts with the intent to carry them out. 8. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-7, wherein the patient is at imminent risk of suicide. 9. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-8, administered in a dose or dosage regimen that causes the patient to experience a peak psychedelic experience. 10. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-9, wherein a dose of about 4 mg to about 20 mg of 5-MeO-DMT is administered, or an equimolar amount of a pharma- ceutically acceptable salt is administered instead of 5-MeO-DMT. 11. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-9, wherein a dosage of about 6 mg or about 12 mg or about 18 mg is administered, or an equimolar amount of a pharma- ceutically acceptable salt is administered instead of 5-MeO-DMT. 12. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-10, wherein 5-MeO-DMT or a salt thereof is administered in a first dosage for a first administration, and 5-MeO-DMT or a salt thereof is administered in 0-6 subsequent administrations, each subsequent administration using a higher dosage than the previous administration unless the patient experiences a peak psychedelic experience. 13. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-12, wherein 5-MeO-DMT is administered at a dosage of about 2 mg to about 8 mg for a first administration, then increased to a dosage of about 8 mg to about 14 mg for a second administration, unless the patient has already experienced a peak psychedelic experience, and then increased to a dosage of about 14 mg to about 20 mg for a third administration, unless the patient has already experienced a peak psychedelic experience, or an equimolar amount of a pharma- ceutically acceptable salt is administered in place of 5-MeO-DMT. 14. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 13, wherein the first dose of 5-MeO-DMT is about 6 mg, the second dose of 5-MeO-DMT is about 12 mg, and the third dose of 5-MeO-DMT is about 18 mg, or an equimolar amount of a pharma- ceutically acceptable salt is administered instead of 5-MeO-DMT. 15. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 12-14, wherein the interval between two administrations is at least 1 hour and at most 24 hours, for example about 2-4 hours. 16. 5-MeO-DMT or a pharma- tically acceptable salt thereof for use according to embodiments 9 to 15, wherein the occurrence of a peak psychedelic experience is determined by the achievement of at least 60% of the highest possible score on each of the four subscales (mystical, positive mood, transcendence of time and space, and ineffability) of the 30-item Revised Mystical Experiences Questionnaire (MEQ30), or by the achievement of at least 60% of the highest possible score on the Oceanic Feeling (OBN) facet of the Altered States of Consciousness (ASC) Questionnaire, or by the achievement of a total score on the Peak Psychedelic Experiences Questionnaire (PPEQ) of at least 75. 17. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 16, wherein the occurrence of a peak psychedelic experience is identified by the achievement of a Peak Psychedelic Experience Questionnaire (PPEQ) total score of at least 75. 18. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to any of the previous embodiments, administered by inhalation. 19. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 18, wherein the 5-MeO-DMT or a pharma- ceutically acceptable salt thereof is administered in the form of an aerosol comprising (a) a pharma- ceutically acceptable gas, and (b) aerosol particles of 5-methoxy-N,N-dimethyltryptamine (5-MeO-DMT) or a pharma- ceutically acceptable salt thereof, wherein the aerosol has a mass density of the aerosol particles of about 0.5 mg / l to about 12.5 mg / l. 20. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 19, wherein the aerosol is generated by a) exposing a thin layer of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof formed on a solid support to thermal energy, and b) passing air over the thin layer to create aerosol particles. 21. 5-MeO-DMT for use according to embodiments 18 to 20, used in the form of the free base. 22. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 18-21, wherein the dosage of 5-MeO-DMT or a pharma- ceutically acceptable salt administered to the patient is inhaled in one breath. 23. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-22, wherein the clinical response, as measured by a score of at least "marked improvement" in the Clinical Global Impression-Improvement (CGI-I) score or the Patient Global Impression-Improvement (PGI-I) score, occurs within about 2 hours after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 24. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 23, wherein the clinical response, as determined by a score of at least "marked improvement" in the CGI-I score or PGI-I score, persists for at least 6 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 25. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 24, in which the clinical response, as determined by a score of at least "marked improvement" in the CGI-I score or PGI-I score, persists for at least 14 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 26. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 25, in which the clinical response, as determined by a score of at least "marked improvement" in the CGI-I score or PGI-I score, persists for at least 28 days after the last administration of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof. 27. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-26, wherein the clinical response, as determined by at least a 50% improvement in MADRS or HAM-D score compared to the respective score before treatment, occurs within about 2 hours after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-27, wherein remission of depressive symptoms as measured by a MADRS score of 28.10 or less or a HAM-D score of 7 or less occurs within about 2 hours after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 29. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-28, wherein the clinical response, as determined by at least a 50% improvement in MADRS or HAM-D score compared to the respective score before treatment, persists until at least 6 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 30. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-29, wherein a clinical response, as determined by at least a 75% improvement in MADRS or HAM-D score compared to the respective score before treatment, is present 7 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 31. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-30, wherein the patient is in remission of depressive symptoms as determined by a MADRS score of 10 or less or a HAM-D score of 7 or less on the 7th day after the last dose of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 32. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-31, in which the clinical response, as determined by at least a 50% improvement in MADRS or HAM-D score compared to the respective score before treatment, persists until at least 14 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 33. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-32, wherein a clinical response, as determined by at least a 75% improvement in MADRS or HAM-D score compared to the respective score before treatment, is present 14 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 34. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-33, in which the patient is in remission of depressive symptoms as determined by a MADRS score of 10 or less or a HAM-D score of 7 or less 14 days after the last dose of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 35. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-34, in which the clinical response, as determined by at least a 50% improvement in MADRS or HAM-D score compared to the respective score before treatment, persists for at least 28 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 36. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-35, wherein a clinical response, as determined by at least a 75% improvement in MADRS or HAM-D score compared to the respective score before treatment, is present 28 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 37. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-36, in which the patient is in remission of depressive symptoms as determined by a MADRS score of 10 or less or a HAM-D score of 7 or less 28 days after the last dose of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 38. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-37, administered in one or more treatment blocks. 39. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 38, wherein the subsequent treatment block is administered at least about 6 days after the preceding treatment block. 40. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 38-39, wherein the first treatment block comprises administration of 5-MeO-DMT or a salt thereof as defined in embodiments 9-22. 41. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 38-40, wherein the first treatment block comprises 1 to 7 administrations of the dose at which the patient experienced a peak experience, with no less than about 1 hour and no more than about 24 hours between each administration. 42. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 38-41, wherein each treatment block comprises 1 to 7 administrations, and the interval between each administration within each treatment block is from about 1 hour to about 24 hours. 43. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 38 or 42, wherein the second and any subsequent treatment blocks comprise one or more administrations of the maximum dose of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof administered during the first treatment block. 44. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof is administered in two or more treatment blocks, wherein in a first treatment block, 5-MeO-DMT or a salt thereof is administered at a first dosage for a first administration, and 5-MeO-DMT or a salt thereof is administered in 0 to 6 subsequent administrations in the first treatment block, each subsequent administration using a higher dosage than the previous administration unless the patient experiences a peak psychedelic experience, and the occurrence of a peak psychedelic experience is determined by a correlation between the highest possible score on each of the four subscales (mystical, positive mood, transcendence in time and space, and indescribability) of the 30-item Revised Mystical Experiences Questionnaire (MEQ30). 5-MeO-DMT or a pharmacologic acceptable salt thereof for use according to embodiments 1-37, wherein the therapeutic effect is identified by the achievement of at least 60% of the highest possible score on the Ocean Sensation (OBN) facet of the Altered States of Consciousness (ASC) questionnaire, or by the achievement of at least 60% of the highest possible score on the Ocean Sensation (OBN) facet of the Altered States of Consciousness (ASC) questionnaire, the interval between two administrations in the first treatment block is greater than or equal to about 1 hour and less than or equal to about 24 hours, the second and any subsequent treatment blocks comprise a single administration of the maximum dose of 5-MeO-DMT or a pharmacologic acceptable salt thereof administered during the first treatment block, and the subsequent treatment block is administered at least about 6 days after the preceding treatment block. 45. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof is administered in two or more treatment blocks, wherein in a first treatment block, 5-MeO-DMT or a salt thereof is administered at a first dosage for a first administration, and 5-MeO-DMT or a salt thereof is administered in 0 to 6 subsequent administrations in the first treatment block, each subsequent administration using a higher dosage than the previous administration unless the patient experiences a peak psychedelic experience, and the occurrence of a peak psychedelic experience is determined by a score of at least 75 Peak Psychedelic Experience Questionnaire. 5-MeO-DMT or a pharmacologic acceptable salt thereof for use according to embodiments 1-37, wherein the interval between two administrations during the first treatment block is greater than or equal to about 1 hour and less than or equal to about 24 hours, the second and any subsequent treatment blocks comprise a single administration of the maximum dose of 5-MeO-DMT or a pharmacologic acceptable salt thereof administered during the first treatment block, and the subsequent treatment block is administered at least about 6 days after the preceding treatment block.

[0140] Embodiments Relating to Treatment of Persistent Depressive Disorder 1. 5-Methoxy-N,N-dimethyltryptamine (5-MeO-DMT) or a pharma- ceutically acceptable salt thereof, for use in the treatment of patients diagnosed by a qualified professional with persistent depressive disorder, in accordance with accepted medical practice. 2. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use as described in embodiment 1, wherein the disorder is diagnosed in accordance with the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5) published by the American Psychiatric Association. 3. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 1 or 2, wherein the patient suffers from moderate or severe depression as indicated by a Montgomery-Asberg Depression Rating Scale (MADRS) score of 20 or greater, or a 17-item Hamilton Depression Rating Scale (HAM-D) score of 17 or greater. 4. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 3, wherein the patient suffers from severe depression as indicated by a MADRS score of 35 or greater, or a HAM-D score of 25 or greater. 5. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 4, wherein the patient is diagnosed with treatment-resistant persistent depressive disorder. 6. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 5, wherein the patient further suffers from suicidal thoughts. 7. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 6, wherein the patient suffers from suicidal thoughts with the intent to carry them out. 8. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-7, wherein the patient is at imminent risk of suicide. 9. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-8, administered in a dose or dosage regimen that causes the patient to experience a peak psychedelic experience. 10. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-9, wherein a dose of about 4 mg to about 20 mg of 5-MeO-DMT is administered, or an equimolar amount of a pharma- ceutically acceptable salt is administered instead of 5-MeO-DMT. 11. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-9, wherein a dosage of about 6 mg or about 12 mg or about 18 mg is administered, or an equimolar amount of a pharma- ceutically acceptable salt is administered instead of 5-MeO-DMT. 12. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-10, wherein 5-MeO-DMT or a salt thereof is administered in a first dosage for a first administration, and 5-MeO-DMT or a salt thereof is administered in 0-6 subsequent administrations, each subsequent administration using a higher dosage than the previous administration unless the patient experiences a peak psychedelic experience. 13. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-12, wherein 5-MeO-DMT is administered at a dosage of about 2 mg to about 8 mg for a first administration, then increased to a dosage of about 8 mg to about 14 mg for a second administration, unless the patient has already experienced a peak psychedelic experience, and then increased to a dosage of about 14 mg to about 20 mg for a third administration, unless the patient has already experienced a peak psychedelic experience, or an equimolar amount of a pharma- ceutically acceptable salt is administered in place of 5-MeO-DMT. 14. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 13, wherein the first dose of 5-MeO-DMT is about 6 mg, the second dose of 5-MeO-DMT is about 12 mg, and the third dose of 5-MeO-DMT is about 18 mg, or an equimolar amount of a pharma- ceutically acceptable salt is administered instead of 5-MeO-DMT. 15. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 12-14, wherein the interval between two administrations is at least 1 hour and at most 24 hours, for example about 2-4 hours. 16. 5-MeO-DMT or a pharma- tically acceptable salt thereof for use according to embodiments 9 to 15, wherein the occurrence of a peak psychedelic experience is determined by the achievement of at least 60% of the highest possible score on each of the four subscales (mystical, positive mood, transcendence of time and space, and ineffability) of the 30-item Revised Mystical Experiences Questionnaire (MEQ30), or by the achievement of at least 60% of the highest possible score on the Oceanic Feeling (OBN) facet of the Altered States of Consciousness (ASC) Questionnaire, or by the achievement of a total score on the Peak Psychedelic Experiences Questionnaire (PPEQ) of at least 75. 17. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 16, wherein the occurrence of a peak psychedelic experience is identified by the achievement of a Peak Psychedelic Experience Questionnaire (PPEQ) total score of at least 75. 18. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to any of the previous embodiments, administered by inhalation. 19. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 18, wherein the 5-MeO-DMT or a pharma- ceutically acceptable salt thereof is administered in the form of an aerosol comprising (a) a pharma- ceutically acceptable gas, and (b) aerosol particles of 5-methoxy-N,N-dimethyltryptamine (5-MeO-DMT) or a pharma- ceutically acceptable salt thereof, wherein the aerosol has a mass density of the aerosol particles of about 0.5 mg / l to about 12.5 mg / l. 20. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 19, wherein the aerosol is generated by a) exposing a thin layer of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof formed on a solid support to thermal energy, and b) passing air over the thin layer to create aerosol particles. 21. 5-MeO-DMT for use according to embodiments 18 to 20, used in the form of the free base. 22. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 18-21, wherein the dosage of 5-MeO-DMT or a pharma- ceutically acceptable salt administered to the patient is inhaled in one breath. 23. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-22, wherein the clinical response, as measured by a score of at least "marked improvement" in the Clinical Global Impression-Improvement (CGI-I) score or the Patient Global Impression-Improvement (PGI-I) score, occurs within about 2 hours after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 24. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 23, wherein the clinical response, as determined by a score of at least "marked improvement" in the CGI-I score or PGI-I score, persists for at least 6 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 25. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 24, in which the clinical response, as determined by a score of at least "marked improvement" in the CGI-I score or PGI-I score, persists for at least 14 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 26. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 25, in which the clinical response, as determined by a score of at least "marked improvement" in the CGI-I score or PGI-I score, persists for at least 28 days after the last administration of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof. 27. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-26, wherein the clinical response, as determined by at least a 50% improvement in MADRS or HAM-D score compared to the respective score before treatment, occurs within about 2 hours after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-27, wherein remission of depressive symptoms as measured by a MADRS score of 28.10 or less or a HAM-D score of 7 or less occurs within about 2 hours after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 29. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-28, wherein the clinical response, as determined by at least a 50% improvement in MADRS or HAM-D score compared to the respective score before treatment, persists until at least 6 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 30. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-29, wherein a clinical response, as determined by at least a 75% improvement in MADRS or HAM-D score compared to the respective score before treatment, is present 7 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 31. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-30, wherein the patient is in remission of depressive symptoms as determined by a MADRS score of 10 or less or a HAM-D score of 7 or less on the 7th day after the last dose of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 32. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-31, in which the clinical response, as determined by at least a 50% improvement in MADRS or HAM-D score compared to the respective score before treatment, persists until at least 14 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 33. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-32, wherein a clinical response, as determined by at least a 75% improvement in MADRS or HAM-D score compared to the respective score before treatment, is present 14 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 34. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-33, in which the patient is in remission of depressive symptoms as determined by a MADRS score of 10 or less or a HAM-D score of 7 or less 14 days after the last dose of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 35. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-34, in which the clinical response, as determined by at least a 50% improvement in MADRS or HAM-D score compared to the respective score before treatment, persists for at least 28 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 36. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-35, wherein a clinical response, as determined by at least a 75% improvement in MADRS or HAM-D score compared to the respective score before treatment, is present 28 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 37. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-36, in which the patient is in remission of depressive symptoms as determined by a MADRS score of 10 or less or a HAM-D score of 7 or less 28 days after the last dose of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 38. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-37, administered in one or more treatment blocks. 39. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 38, wherein the subsequent treatment block is administered at least about 6 days after the preceding treatment block. 40. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 38-39, wherein the first treatment block comprises administration of 5-MeO-DMT or a salt thereof as defined in embodiments 9-22. 41. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 38-40, wherein the first treatment block comprises 1 to 7 administrations of the dose at which the patient experienced a peak experience, with no less than about 1 hour and no more than about 24 hours between each administration. 42. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 38-41, wherein each treatment block comprises 1 to 7 administrations, and the interval between each administration within each treatment block is from about 1 hour to about 24 hours. 43. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 38 or 42, wherein the second and any subsequent treatment blocks comprise one or more administrations of the maximum dose of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof administered during the first treatment block. 44. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof is administered in two or more treatment blocks, wherein in a first treatment block, 5-MeO-DMT or a salt thereof is administered at a first dosage for a first administration, and 5-MeO-DMT or a salt thereof is administered in 0 to 6 subsequent administrations in the first treatment block, each subsequent administration using a higher dosage than the previous administration unless the patient experiences a peak psychedelic experience, and the occurrence of a peak psychedelic experience is determined by the highest possible score on each of the four subscales (mystical, positive mood, transcendence in time and space, and indescribability) of the 30-item Revised Mystical Experiences Questionnaire (MEQ30). or by achievement of at least 60% of the highest possible score on the Ocean Sensation (OBN) facet of the Altered States of Consciousness (ASC) questionnaire, the interval between two administrations in a first treatment block is greater than or equal to about 1 hour and less than or equal to about 24 hours, the second and any subsequent treatment blocks comprise a single administration of the maximum dose of 5-MeO-DMT or a pharmacologic acceptable salt thereof administered during the first treatment block, and the subsequent treatment block is administered at least about 6 days after the preceding treatment block. 45. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof is administered in two or more treatment blocks, wherein in a first treatment block, 5-MeO-DMT or a salt thereof is administered in a first dosage for a first administration, and 5-MeO-DMT or a salt thereof is administered in 0 to 6 subsequent administrations in the first treatment block, each subsequent administration using a higher dosage than the previous administration unless the patient experiences a peak psychedelic experience, and the occurrence of a peak psychedelic experience is associated with a peak psychedelic experience quality of at least 75. 5-MeO-DMT or a pharmacologic acceptable salt thereof for use according to embodiments 1-37, wherein the interval between two administrations during the first treatment block is greater than or equal to about 1 hour and less than or equal to about 24 hours, the second and any subsequent treatment blocks comprise a single administration of the maximum dose of 5-MeO-DMT or a pharmacologic acceptable salt thereof administered during the first treatment block, and the subsequent treatment block is administered at least about 6 days after the preceding treatment block.

[0141] Embodiments Related to Treatment of Anxiety Disorders 1. 5-Methoxy-N,N-dimethyltryptamine (5-MeO-DMT) or a pharma- ceutically acceptable salt thereof, for use in the treatment of a patient diagnosed with an anxiety disorder by a qualified professional in accordance with accepted medical practice. 2. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use as described in embodiment 1, wherein the disorder is diagnosed in accordance with the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5) published by the American Psychiatric Association. 3. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 1 or 2, wherein the patient suffers from moderate or severe anxiety as indicated by a Beck Anxiety Inventory (BAI) score of 19 or greater or a Hamilton Anxiety Scale (HAM-A) score of 15 or greater. 4. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 3, wherein the patient suffers from severe anxiety as indicated by a BAI score of 30 or greater, or by a HAM-A score of 24 or greater. 5. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 4, wherein the patient is diagnosed with treatment-resistant anxiety disorder. 6. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 5, wherein the patient further suffers from suicidal thoughts. 7. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 6, wherein the patient suffers from suicidal thoughts with the intent to carry them out. 8. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-7, wherein the patient is at imminent risk of suicide. 9. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-8, wherein the 5-MeO-DMT or salt thereof is administered in a dose or dosage regimen that causes the patient to experience a peak psychedelic experience. 10. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-9, wherein a dose of about 4 mg to about 20 mg of 5-MeO-DMT is administered, or an equimolar amount of a pharma- ceutically acceptable salt is administered instead of 5-MeO-DMT. 11. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-9, wherein a dosage of about 6 mg or about 12 mg or about 18 mg is administered, or an equimolar amount of a pharma- ceutically acceptable salt is administered instead of 5-MeO-DMT. 12. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-10, wherein 5-MeO-DMT or a salt thereof is administered in a first dosage for a first administration, and 5-MeO-DMT or a salt thereof is administered in 0-6 subsequent administrations, each subsequent administration using a higher dosage than the previous administration unless the patient experiences a peak psychedelic experience. 13. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-12, wherein 5-MeO-DMT is administered at a dosage of about 2 mg to about 8 mg for a first administration, then increased to a dosage of about 8 mg to about 14 mg for a second administration, unless the patient has already experienced a peak psychedelic experience, and then increased to a dosage of about 14 mg to about 20 mg for a third administration, unless the patient has already experienced a peak psychedelic experience, or an equimolar amount of a pharma- ceutically acceptable salt is administered in place of 5-MeO-DMT. 14. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 13, wherein the first dose of 5-MeO-DMT is about 6 mg, the second dose of 5-MeO-DMT is about 12 mg, and the third dose of 5-MeO-DMT is about 18 mg, or an equimolar amount of a pharma- ceutically acceptable salt is administered instead of 5-MeO-DMT. 15. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 12-14, wherein the interval between two administrations is at least 1 hour and at most 24 hours, for example about 2-4 hours. 16. 5-MeO-DMT or a pharma- tically acceptable salt thereof for use according to embodiments 9 to 15, wherein the occurrence of a peak psychedelic experience is determined by the achievement of at least 60% of the highest possible score on each of the four subscales (mystical, positive mood, transcendence of time and space, and ineffability) of the 30-item Revised Mystical Experiences Questionnaire (MEQ30), or by the achievement of at least 60% of the highest possible score on the Oceanic Feeling (OBN) facet of the Altered States of Consciousness (ASC) Questionnaire, or by the achievement of a total score on the Peak Psychedelic Experiences Questionnaire (PPEQ) of at least 75. 17. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 16, wherein the occurrence of a peak psychedelic experience is identified by the achievement of a Peak Psychedelic Experience Questionnaire (PPEQ) total score of at least 75. 18. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to any of the previous embodiments, administered by inhalation. 19. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 18, wherein the 5-MeO-DMT or a pharma- ceutically acceptable salt thereof is administered in the form of an aerosol comprising (a) a pharma- ceutically acceptable gas, and (b) aerosol particles of 5-methoxy-N,N-dimethyltryptamine (5-MeO-DMT) or a pharma- ceutically acceptable salt thereof, wherein the aerosol has a mass density of the aerosol particles of about 0.5 mg / l to about 12.5 mg / l. 20. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 19, wherein the aerosol is generated by a) exposing a thin layer of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof formed on a solid support to thermal energy, and b) passing air through the thin layer to create aerosol particles. 21. 5-MeO-DMT for use according to embodiments 18 to 20, used in the form of the free base. 22. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 18-21, wherein the dosage of 5-MeO-DMT or a pharma- ceutically acceptable salt administered to the patient is inhaled in one breath. 23. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-22, wherein the clinical response, as measured by a score of at least "marked improvement" in the Clinical Global Impression-Improvement (CGI-I) score or the Patient Global Impression-Improvement (PGI-I) score, occurs within about 2 hours after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 24. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 23, wherein the clinical response, as determined by a score of at least "marked improvement" in the CGI-I score or PGI-I score, persists for at least 6 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 25. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 24, in which the clinical response, as determined by a score of at least "marked improvement" in the CGI-I score or PGI-I score, persists for at least 14 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 26. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 25, in which the clinical response, as determined by a score of at least "marked improvement" in the CGI-I score or PGI-I score, persists for at least 28 days after the last administration of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof. 27. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-26, wherein the clinical response, as determined by at least a 50% improvement in BAI or HAM-A score compared to the respective scores before treatment, occurs within about 2 hours after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-27, wherein remission of anxiety symptoms as measured by a BAI score of 28.9 or less, or by a HAM-A score of 7 or less, occurs within about 2 hours after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 29. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-28, wherein the clinical response, as determined by at least a 50% improvement in the BAI or HAM-A score compared to the respective scores before treatment, persists until at least 6 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 30. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-29, wherein a clinical response, as determined by at least a 75% improvement in BAI or HAM-A score compared to the respective scores before treatment, is present 7 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 31. 5-MeO-DMT or a pharma- ceutical acceptable salt thereof for use according to embodiments 1-30, in which the patient is in remission of anxiety symptoms as determined by a BAI score of 9 or less or a HAM-A score of 7 or less on the 7th day after the last administration of 5-MeO-DMT or a pharma- ceutical acceptable salt thereof. 32. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-31, in which the clinical response, as determined by at least a 50% improvement in the BAI or HAM-A score compared to the respective scores before treatment, persists until at least 14 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 33. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-32, wherein a clinical response, as determined by at least a 75% improvement in BAI or HAM-A score compared to the respective scores before treatment, is present 14 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 34. 5-MeO-DMT or a pharma- ceutical acceptable salt thereof for use according to embodiments 1-33, in which the patient is in remission of anxiety symptoms as determined by a BAI score of 9 or less or a HAM-A score of 7 or less 14 days after the last administration of 5-MeO-DMT or a pharma- ceutical acceptable salt thereof. 35. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-34, in which the clinical response, as determined by at least a 50% improvement in the BAI or HAM-A score compared to the respective scores before treatment, persists for at least 28 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 36. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-35, wherein a clinical response, as determined by at least a 75% improvement in BAI or HAM-A score compared to the respective scores before treatment, is present 28 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 37. 5-MeO-DMT or a pharma- ceutical acceptable salt thereof for use according to embodiments 1-36, in which the patient is in remission of anxiety symptoms as determined by a BAI score of 9 or less or a HAM-A score of 7 or less 28 days after the last dose of 5-MeO-DMT or a pharma- ceutical acceptable salt thereof. 38. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-37, administered in one or more treatment blocks. 39. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 38, wherein the subsequent treatment block is administered at least about 6 days after the preceding treatment block. 40. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 38-39, wherein the first treatment block comprises administration of 5-MeO-DMT or a salt thereof as defined in embodiments 9-22. 41. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 38-40, wherein the first treatment block comprises 1 to 7 administrations of the dose at which the patient experienced a peak experience, with no less than about 1 hour and no more than about 24 hours between each administration. 42. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 38-41, wherein each treatment block comprises 1 to 7 administrations, and the interval between each administration within each treatment block is from about 1 hour to about 24 hours. 43. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 38 or 42, wherein the second and any subsequent treatment blocks comprise one or more administrations of the maximum dose of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof administered during the first treatment block. 44. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof is administered in two or more treatment blocks, wherein in a first treatment block, 5-MeO-DMT or a salt thereof is administered at a first dosage for a first administration, and 5-MeO-DMT or a salt thereof is administered in 0 to 6 subsequent administrations in the first treatment block, each subsequent administration using a higher dosage than the previous administration unless the patient experiences a peak psychedelic experience, and the occurrence of a peak psychedelic experience is determined by the highest possible score on each of the four subscales (mystical, positive mood, transcendence in time and space, and indescribability) of the 30-item Revised Mystical Experiences Questionnaire (MEQ30). or by achievement of at least 60% of the highest possible score on the Ocean Sensation (OBN) facet of the Altered States of Consciousness (ASC) questionnaire, the interval between two administrations in a first treatment block is greater than or equal to about 1 hour and less than or equal to about 24 hours, the second and any subsequent treatment blocks comprise a single administration of the maximum dose of 5-MeO-DMT or a pharmacologic acceptable salt thereof administered during the first treatment block, and the subsequent treatment block is administered at least about 6 days after the preceding treatment block. 45. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof is administered in two or more treatment blocks, wherein in a first treatment block, 5-MeO-DMT or a salt thereof is administered in a first dosage for a first administration, and 5-MeO-DMT or a salt thereof is administered in 0 to 6 subsequent administrations in the first treatment block, each subsequent administration using a higher dosage than the previous administration unless the patient experiences a peak psychedelic experience, and the occurrence of a peak psychedelic experience is associated with a peak psychedelic experience quality of at least 75. 5-MeO-DMT or a pharmacologic acceptable salt thereof for use according to embodiments 1-37, wherein the interval between two administrations during the first treatment block is greater than or equal to about 1 hour and less than or equal to about 24 hours, the second and any subsequent treatment blocks comprise a single administration of the maximum dose of 5-MeO-DMT or a pharmacologic acceptable salt thereof administered during the first treatment block, and the subsequent treatment block is administered at least about 6 days after the preceding treatment block.

[0142] Embodiments Related to Treatment of Post-Traumatic Stress Disorder 1. 5-Methoxy-N,N-dimethyltryptamine (5-MeO-DMT) or a pharma- ceutically acceptable salt thereof, for use in the treatment of a patient diagnosed by a qualified professional with post-traumatic stress disorder, in accordance with accepted medical practice. 2. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use as described in embodiment 1, wherein the disorder is diagnosed in accordance with the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5) published by the American Psychiatric Association. 3. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 1 or 2, wherein the patient suffers from moderate, severe or extreme post-traumatic stress disorder as indicated by a total score of 23 or more of the 20 severity items of the Clinical Interview for Post-Traumatic Stress Disorder Scale for DSM-5 (CAPS-5). 4. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 3, wherein the patient suffers from severe or extreme post-traumatic stress disorder as indicated by a total score of 35 or more of the 20 severity items of the CAPS-5. 5. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-4, wherein the patient is diagnosed with treatment-resistant post-traumatic stress disorder. 6. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 5, wherein the patient further suffers from suicidal thoughts. 7. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 6, wherein the patient suffers from suicidal thoughts with the intent to carry them out. 8. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-7, wherein the patient is at imminent risk of suicide. 9. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-8, wherein the 5-MeO-DMT or salt thereof is administered in a dose or dosage regimen that causes the patient to experience a peak psychedelic experience. 10. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-9, wherein a dose of about 4 mg to about 20 mg of 5-MeO-DMT is administered, or an equimolar amount of a pharma- ceutically acceptable salt is administered instead of 5-MeO-DMT. 11. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-9, wherein a dosage of about 6 mg or about 12 mg or about 18 mg is administered, or an equimolar amount of a pharma- ceutically acceptable salt is administered instead of 5-MeO-DMT. 12. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-10, wherein 5-MeO-DMT or a salt thereof is administered in a first dosage for a first administration, and 5-MeO-DMT or a salt thereof is administered in 0-6 subsequent administrations, each subsequent administration using a higher dosage than the previous administration unless the patient experiences a peak psychedelic experience. 13. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-12, wherein 5-MeO-DMT is administered at a dosage of about 2 mg to about 8 mg for a first administration, then increased to a dosage of about 8 mg to about 14 mg for a second administration, unless the patient has already experienced a peak psychedelic experience, and then increased to a dosage of about 14 mg to about 20 mg for a third administration, unless the patient has already experienced a peak psychedelic experience, or an equimolar amount of a pharma- ceutically acceptable salt is administered in place of 5-MeO-DMT. 14. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 13, wherein the first dose of 5-MeO-DMT is about 6 mg, the second dose of 5-MeO-DMT is about 12 mg, and the third dose of 5-MeO-DMT is about 18 mg, or an equimolar amount of a pharma- ceutically acceptable salt is administered instead of 5-MeO-DMT. 15. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 12-14, wherein the interval between two administrations is at least 1 hour and at most 24 hours, for example about 2-4 hours. 16. 5-MeO-DMT or a pharma- tically acceptable salt thereof for use according to embodiments 9 to 15, wherein the occurrence of a peak psychedelic experience is determined by the achievement of at least 60% of the highest possible score on each of the four subscales (mystical, positive mood, transcendence of time and space, and ineffability) of the 30-item Revised Mystical Experiences Questionnaire (MEQ30), or by the achievement of at least 60% of the highest possible score on the Oceanic Feeling (OBN) facet of the Altered States of Consciousness (ASC) Questionnaire, or by the achievement of a total score on the Peak Psychedelic Experiences Questionnaire (PPEQ) of at least 75. 17. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 16, wherein the occurrence of a peak psychedelic experience is identified by the achievement of a Peak Psychedelic Experience Questionnaire (PPEQ) total score of at least 75. 18. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to any of the previous embodiments, administered by inhalation. 19. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 18, wherein the 5-MeO-DMT or a pharma- ceutically acceptable salt thereof is administered in the form of an aerosol comprising (a) a pharma- ceutically acceptable gas, and (b) aerosol particles of 5-methoxy-N,N-dimethyltryptamine (5-MeO-DMT) or a pharma- ceutically acceptable salt thereof, wherein the aerosol has a mass density of the aerosol particles of about 0.5 mg / l to about 12.5 mg / l. 20. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 19, wherein the aerosol is generated by a) exposing a thin layer of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof formed on a solid support to thermal energy, and b) passing air through the thin layer to create aerosol particles. 21. 5-MeO-DMT for use according to embodiments 18 to 20, used in the form of the free base. 22. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 18-21, wherein the dosage of 5-MeO-DMT or a pharma- ceutically acceptable salt administered to the patient is inhaled in one breath. 23. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-22, wherein the clinical response, as measured by a score of at least "marked improvement" in the Clinical Global Impression-Improvement (CGI-I) score or the Patient Global Impression-Improvement (PGI-I) score, occurs within about 2 hours after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 24. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 23, wherein the clinical response, as determined by a score of at least "marked improvement" in the CGI-I score or PGI-I score, persists for at least 6 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 25. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 24, in which the clinical response, as determined by a score of at least "marked improvement" in the CGI-I score or PGI-I score, persists for at least 14 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 26. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 25, in which the clinical response, as determined by a score of at least "marked improvement" in the CGI-I score or PGI-I score, persists for at least 28 days after the last administration of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof. 27. 5-MeO-DMT or a pharma- ceutical acceptable salt thereof for use according to embodiments 1-26, wherein a clinical response, as measured by at least a 30% improvement in the total score of the 20 severity items of the CAPS-5 compared to the pre-treatment score, occurs within about 7 days after the last administration of 5-MeO-DMT or a pharma- ceutical acceptable salt thereof. 28. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to any one of embodiments 1 to 27, wherein remission of symptoms of post-traumatic stress disorder, as measured by a total score of 10 or less on the 20 severity items of the CAPS-5, occurs within about 7 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 29. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-28, in which the clinical response, as measured by at least a 30% improvement in the total score of the 20 severity items of the CAPS-5 compared to the score before treatment, is sustained for at least 14 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 30. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-29, wherein a clinical response, as determined by at least a 50% improvement in the total score of the 20 severity items of the CAPS-5 compared to the score before treatment, is present 7 days after the last administration of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof. 31. 5-MeO-DMT or a pharma- ceutical acceptable salt thereof for use according to any one of embodiments 1 to 30, in which the patient is in remission of symptoms of post-traumatic stress disorder as determined by a total score of 10 or less on the 20 severity items of the CAPS-5 7 days after the last administration of 5-MeO-DMT or a pharma-ceutical acceptable salt thereof. 32. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-31, in which the clinical response, as measured by at least a 30% improvement in the total score of the 20 severity items of the CAPS-5 compared to the score before treatment, is sustained for at least 21 days after the last administration of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof. 33. 5-MeO-DMT or a pharma- ceutical acceptable salt thereof for use according to embodiments 1-32, in which a clinical response, as measured by at least a 50% improvement in the total score of the 20 severity items of the CAPS-5 compared to the score before treatment, is present 14 days after the last administration of 5-MeO-DMT or a pharma- ceutical acceptable salt thereof. 34. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to any one of embodiments 1 to 33, in which the patient is in remission of symptoms of post-traumatic stress disorder as determined by a total score of 10 or less on the 20 severity items of the CAPS-5 14 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 35. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-34, in which the clinical response, as measured by at least a 30% improvement in the total score of the 20 severity items of the CAPS-5 compared to the score before treatment, is sustained for at least 28 days after the last administration of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof. 36. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-35, wherein a clinical response, as determined by at least a 50% improvement in the total score of the 20 severity items of the CAPS-5 compared to the score before treatment, is present 28 days after the last administration of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof. 37. 5-MeO-DMT or a pharma- ceutical acceptable salt thereof for use according to embodiments 1-36, in which the patient is in remission of symptoms of post-traumatic stress disorder as determined by a total score of 10 or less on the 20 severity items of the CAPS-5 28 days after the last administration of 5-MeO-DMT or a pharma- ceutical acceptable salt thereof. 38. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-37, administered in one or more treatment blocks. 39. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 38, wherein the subsequent treatment block is administered at least about 6 days after the preceding treatment block. 40. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 38-39, wherein the first treatment block comprises administration of 5-MeO-DMT or a salt thereof as defined in embodiments 9-22. 41. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 38-40, wherein the first treatment block comprises 1 to 7 administrations of the dose at which the patient experienced a peak experience, with no less than about 1 hour and no more than about 24 hours between each administration. 42. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 38-41, wherein each treatment block comprises 1 to 7 administrations, and the interval between each administration within each treatment block is from about 1 hour to about 24 hours. 43. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 38 or 42, wherein the second and any subsequent treatment blocks comprise one or more administrations of the maximum dose of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof administered during the first treatment block. 44. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof is administered in two or more treatment blocks, wherein in a first treatment block, 5-MeO-DMT or a salt thereof is administered at a first dosage for a first administration, and 5-MeO-DMT or a salt thereof is administered in 0 to 6 subsequent administrations in the first treatment block, each subsequent administration using a higher dosage than the previous administration unless the patient experiences a peak psychedelic experience, and the occurrence of a peak psychedelic experience is determined by the highest possible score on each of the four subscales (mystical, positive mood, transcendence in time and space, and indescribability) of the 30-item Revised Mystical Experiences Questionnaire (MEQ30). or by achievement of at least 60% of the highest possible score on the Ocean Sensation (OBN) facet of the Altered States of Consciousness (ASC) questionnaire, the interval between two administrations in a first treatment block is greater than or equal to about 1 hour and less than or equal to about 24 hours, the second and any subsequent treatment blocks comprise a single administration of the maximum dose of 5-MeO-DMT or a pharmacologic acceptable salt thereof administered during the first treatment block, and the subsequent treatment block is administered at least about 6 days after the preceding treatment block. 45. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof is administered in two or more treatment blocks, wherein in a first treatment block, 5-MeO-DMT or a salt thereof is administered in a first dosage for a first administration, and 5-MeO-DMT or a salt thereof is administered in 0 to 6 subsequent administrations in the first treatment block, each subsequent administration using a higher dosage than the previous administration unless the patient experiences a peak psychedelic experience, and the occurrence of a peak psychedelic experience is associated with a peak psychedelic experience quality of at least 75. 5-MeO-DMT or a pharmacologic acceptable salt thereof for use according to embodiments 1-37, wherein the interval between two administrations during the first treatment block is greater than or equal to about 1 hour and less than or equal to about 24 hours, the second and any subsequent treatment blocks comprise a single administration of the maximum dose of 5-MeO-DMT or a pharmacologic acceptable salt thereof administered during the first treatment block, and the subsequent treatment block is administered at least about 6 days after the preceding treatment block.

[0143] Embodiments Relating to Treatment of Body Dysmorphic Disorder 1. 5-Methoxy-N,N-dimethyltryptamine (5-MeO-DMT) or a pharma- ceutically acceptable salt thereof, for use in the treatment of patients diagnosed with body dysmorphic disorder by a qualified professional in accordance with accepted medical practice. 2. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use as described in embodiment 1, wherein the disorder is diagnosed in accordance with the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5) published by the American Psychiatric Association. 3. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 1 or 2, wherein the patient suffers from moderate or severe body dysmorphic disorder as indicated by a score of 31 or greater on the Yale-Brown Obsessive-Compulsive Disorder Rating Scale, Modified for Body Dysmorphic Disorder (BDD-YBOCS). 4. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 3, wherein the patient suffers from severe body dysmorphic disorder as indicated by a score of 41 or greater on the BDD-YBOCS. 5. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-4, wherein the patient is diagnosed with treatment-resistant body dysmorphic disorder. 6. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 5, wherein the patient further suffers from suicidal thoughts. 7. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 6, wherein the patient suffers from suicidal thoughts with the intent to carry them out. 8. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-7, wherein the patient is at imminent risk of suicide. 9. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-8, wherein the 5-MeO-DMT or salt thereof is administered in a dose or dosage regimen that causes the patient to experience a peak psychedelic experience. 10. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-9, wherein a dose of about 4 mg to about 20 mg of 5-MeO-DMT is administered, or an equimolar amount of a pharma- ceutically acceptable salt is administered instead of 5-MeO-DMT. 11. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-9, wherein a dosage of about 6 mg or about 12 mg or about 18 mg is administered, or an equimolar amount of a pharma- ceutically acceptable salt is administered instead of 5-MeO-DMT. 12. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-10, wherein 5-MeO-DMT or a salt thereof is administered in a first dosage for a first administration, and 5-MeO-DMT or a salt thereof is administered in 0-6 subsequent administrations, each subsequent administration using a higher dosage than the previous administration unless the patient experiences a peak psychedelic experience. 13. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-12, wherein 5-MeO-DMT is administered at a dosage of about 2 mg to about 8 mg for a first administration, then increased to a dosage of about 8 mg to about 14 mg for a second administration, unless the patient has already experienced a peak psychedelic experience, and then increased to a dosage of about 14 mg to about 20 mg for a third administration, unless the patient has already experienced a peak psychedelic experience, or an equimolar amount of a pharma- ceutically acceptable salt is administered in place of 5-MeO-DMT. 14. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 13, wherein the first dose of 5-MeO-DMT is about 6 mg, the second dose of 5-MeO-DMT is about 12 mg, and the third dose of 5-MeO-DMT is about 18 mg, or an equimolar amount of a pharma- ceutically acceptable salt is administered instead of 5-MeO-DMT. 15. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 12-14, wherein the interval between two administrations is at least 1 hour and at most 24 hours, for example about 2-4 hours. 16. 5-MeO-DMT or a pharma- tically acceptable salt thereof for use according to embodiments 9 to 15, wherein the occurrence of a peak psychedelic experience is determined by the achievement of at least 60% of the highest possible score on each of the four subscales (mystical, positive mood, transcendence of time and space, and ineffability) of the 30-item Revised Mystical Experiences Questionnaire (MEQ30), or by the achievement of at least 60% of the highest possible score on the Oceanic Feeling (OBN) facet of the Altered States of Consciousness (ASC) Questionnaire, or by the achievement of a total score on the Peak Psychedelic Experiences Questionnaire (PPEQ) of at least 75. 17. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 16, wherein the occurrence of a peak psychedelic experience is identified by the achievement of a Peak Psychedelic Experience Questionnaire (PPEQ) total score of at least 75. 18. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to any of the previous embodiments, administered by inhalation. 19. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 18, wherein the 5-MeO-DMT or a pharma- ceutically acceptable salt thereof is administered in the form of an aerosol comprising (a) a pharma- ceutically acceptable gas, and (b) aerosol particles of 5-methoxy-N,N-dimethyltryptamine (5-MeO-DMT) or a pharma- ceutically acceptable salt thereof, wherein the aerosol has a mass density of the aerosol particles of about 0.5 mg / l to about 12.5 mg / l. 20. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 19, wherein the aerosol is generated by a) exposing a thin layer of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof formed on a solid support to thermal energy, and b) passing air through the thin layer to create aerosol particles. 21. 5-MeO-DMT for use according to embodiments 18 to 20, used in the form of the free base. 22. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 18-21, wherein the dosage of 5-MeO-DMT or a pharma- ceutically acceptable salt administered to the patient is inhaled in one breath. 23. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-22, wherein the clinical response, as measured by a score of at least "marked improvement" in the Clinical Global Impression-Improvement (CGI-I) score or the Patient Global Impression-Improvement (PGI-I) score, occurs within about 2 hours after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 24. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 23, wherein the clinical response, as determined by a score of at least "marked improvement" in the CGI-I score or PGI-I score, persists for at least 6 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 25. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 24, in which the clinical response, as determined by a score of at least "marked improvement" in the CGI-I score or PGI-I score, persists for at least 14 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 26. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 25, in which the clinical response, as determined by a score of at least "marked improvement" in the CGI-I score or PGI-I score, persists for at least 28 days after the last administration of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof. 27. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-26, wherein a clinical response, as measured by at least a 30% improvement in the BDD-YBOCS compared to pre-treatment scores, occurs within about 7 days after the last dose of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 28. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-27, wherein remission of symptoms of body dysmorphic disorder, as determined by a score of 16 or less on the BDD-YBOCS, occurs within about 7 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 29. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-28, in which the clinical response, as measured by at least a 30% improvement in the BDD-YBOCS compared to the pre-treatment score, is sustained for at least 14 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 30. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-29, wherein a clinical response, as determined by at least a 50% improvement in the BDD-YBOCS compared to the pre-treatment score, is present 7 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 31. 5-MeO-DMT or a pharma- ceutical acceptable salt thereof for use according to embodiments 1-30, in which the patient is in remission of symptoms of body dysmorphic disorder as determined by a score of 16 or less on the BDD-YBOCS 7 days after the last administration of 5-MeO-DMT or a pharma- ceutical acceptable salt thereof. 32. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-31, in which the clinical response, as measured by at least a 30% improvement in the BDD-YBOCS compared to the pre-treatment score, is sustained for at least 21 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 33. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-32, wherein a clinical response, as determined by at least a 50% improvement in the BDD-YBOCS compared to the pre-treatment score, is present 14 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 34. 5-MeO-DMT or a pharma- ceutical acceptable salt thereof for use according to embodiments 1-33, in which the patient is in remission of symptoms of body dysmorphic disorder as determined by a score of 16 or less on the BDD-YBOCS 14 days after the last administration of 5-MeO-DMT or a pharma-ceutical acceptable salt thereof. 35. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-34, in which the clinical response, as measured by at least a 30% improvement in the BDD-YBOCS compared to the pre-treatment score, is sustained for at least 28 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 36. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-35, wherein a clinical response, as determined by at least a 50% improvement in the BDD-YBOCS compared to the pre-treatment score, is present 28 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 37. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-36, in which the patient is in remission of symptoms of body dysmorphic disorder as determined by a score of 16 or less on the BDD-YBOCS 28 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 38. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-37, administered in one or more treatment blocks. 39. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 38, wherein the subsequent treatment block is administered at least about 6 days after the preceding treatment block. 40. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 38-39, wherein the first treatment block comprises administration of 5-MeO-DMT or a salt thereof as defined in embodiments 9-22. 41. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 38-40, wherein the first treatment block comprises 1 to 7 administrations of the dose at which the patient experienced a peak experience, with no less than about 1 hour and no more than about 24 hours between each administration. 42. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 38-41, wherein each treatment block comprises 1 to 7 administrations, and the interval between each administration within each treatment block is from about 1 hour to about 24 hours. 43. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 38 or 42, wherein the second and any subsequent treatment blocks comprise one or more administrations of the maximum dose of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof administered during the first treatment block. 44. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof is administered in two or more treatment blocks, wherein in a first treatment block, 5-MeO-DMT or a salt thereof is administered at a first dosage for a first administration, and 5-MeO-DMT or a salt thereof is administered in 0 to 6 subsequent administrations in the first treatment block, each subsequent administration using a higher dosage than the previous administration unless the patient experiences a peak psychedelic experience, and the occurrence of a peak psychedelic experience is determined by the highest possible score on each of the four subscales (mystical, positive mood, transcendence in time and space, and indescribability) of the 30-item Revised Mystical Experiences Questionnaire (MEQ30). or by achievement of at least 60% of the highest possible score on the Ocean Sensation (OBN) facet of the Altered States of Consciousness (ASC) questionnaire, the interval between two administrations in a first treatment block is greater than or equal to about 1 hour and less than or equal to about 24 hours, the second and any subsequent treatment blocks comprise a single administration of the maximum dose of 5-MeO-DMT or a pharmacologic acceptable salt thereof administered during the first treatment block, and the subsequent treatment block is administered at least about 6 days after the preceding treatment block. 45. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof is administered in two or more treatment blocks, wherein in a first treatment block, 5-MeO-DMT or a salt thereof is administered in a first dosage for a first administration, and 5-MeO-DMT or a salt thereof is administered in 0 to 6 subsequent administrations in the first treatment block, each subsequent administration using a higher dosage than the previous administration unless the patient experiences a peak psychedelic experience, and the occurrence of a peak psychedelic experience is associated with a peak psychedelic experience quality of at least 75. 5-MeO-DMT or a pharmacologic acceptable salt thereof for use according to embodiments 1-37, wherein the interval between two administrations during the first treatment block is greater than or equal to about 1 hour and less than or equal to about 24 hours, the second and any subsequent treatment blocks comprise a single administration of the maximum dose of 5-MeO-DMT or a pharmacologic acceptable salt thereof administered during the first treatment block, and the subsequent treatment block is administered at least about 6 days after the preceding treatment block.

[0144] Embodiments Relating to Treatment of Obsessive-Compulsive Disorder 1. 5-Methoxy-N,N-dimethyltryptamine (5-MeO-DMT) or a pharma- ceutically acceptable salt thereof, for use in the treatment of patients diagnosed with obsessive-compulsive disorder by a qualified professional in accordance with accepted medical practice. 2. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use as described in embodiment 1, wherein the disorder is diagnosed in accordance with the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5) published by the American Psychiatric Association. 3. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 1 or 2, wherein the patient suffers from moderate or severe obsessive-compulsive disorder as indicated by a score of 26 or greater on the Yale-Brown Obsessive-Compulsive Scale (Y-BOCS). 4. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 3, wherein the patient suffers from severe obsessive-compulsive disorder as indicated by a Y-BOCS total score of 35 or greater. 5. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-4, wherein the patient is diagnosed with treatment-resistant obsessive-compulsive disorder. 6. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 5, wherein the patient further suffers from suicidal thoughts. 7. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 6, wherein the patient suffers from suicidal thoughts with the intent to carry them out. 8. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-7, wherein the patient is at imminent risk of suicide. 9. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-8, wherein the 5-MeO-DMT or salt thereof is administered in a dose or dosage regimen that causes the patient to experience a peak psychedelic experience. 10. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-9, wherein a dose of about 4 mg to about 20 mg of 5-MeO-DMT is administered, or an equimolar amount of a pharma- ceutically acceptable salt is administered instead of 5-MeO-DMT. 11. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-9, wherein a dosage of about 6 mg or about 12 mg or about 18 mg is administered, or an equimolar amount of a pharma- ceutically acceptable salt is administered instead of 5-MeO-DMT. 12. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-10, wherein 5-MeO-DMT or a salt thereof is administered in a first dosage for a first administration, and 5-MeO-DMT or a salt thereof is administered in 0-6 subsequent administrations, each subsequent administration using a higher dosage than the previous administration unless the patient experiences a peak psychedelic experience. 13. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-12, wherein 5-MeO-DMT is administered at a dosage of about 2 mg to about 8 mg for a first administration, then increased to a dosage of about 8 mg to about 14 mg for a second administration, unless the patient has already experienced a peak psychedelic experience, and then increased to a dosage of about 14 mg to about 20 mg for a third administration, unless the patient has already experienced a peak psychedelic experience, or an equimolar amount of a pharma- ceutically acceptable salt is administered in place of 5-MeO-DMT. 14. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 13, wherein the first dose of 5-MeO-DMT is about 6 mg, the second dose of 5-MeO-DMT is about 12 mg, and the third dose of 5-MeO-DMT is about 18 mg, or an equimolar amount of a pharma- ceutically acceptable salt is administered instead of 5-MeO-DMT. 15. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 12-14, wherein the interval between two administrations is at least 1 hour and at most 24 hours, for example about 2-4 hours. 16. 5-MeO-DMT or a pharma- tically acceptable salt thereof for use according to embodiments 9 to 15, wherein the occurrence of a peak psychedelic experience is determined by the achievement of at least 60% of the highest possible score on each of the four subscales (mystical, positive mood, transcendence of time and space, and ineffability) of the 30-item Revised Mystical Experiences Questionnaire (MEQ30), or by the achievement of at least 60% of the highest possible score on the Oceanic Feeling (OBN) facet of the Altered States of Consciousness (ASC) Questionnaire, or by the achievement of a total score on the Peak Psychedelic Experiences Questionnaire (PPEQ) of at least 75. 17. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 16, wherein the occurrence of a peak psychedelic experience is identified by the achievement of a Peak Psychedelic Experience Questionnaire (PPEQ) total score of at least 75. 18. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to any of the previous embodiments, administered by inhalation. 19. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 18, wherein the 5-MeO-DMT or a pharma- ceutically acceptable salt thereof is administered in the form of an aerosol comprising (a) a pharma- ceutically acceptable gas, and (b) aerosol particles of 5-methoxy-N,N-dimethyltryptamine (5-MeO-DMT) or a pharma- ceutically acceptable salt thereof, wherein the aerosol has a mass density of the aerosol particles of about 0.5 mg / l to about 12.5 mg / l. 20. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 19, wherein the aerosol is generated by a) exposing a thin layer of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof formed on a solid support to thermal energy, and b) passing air through the thin layer to create aerosol particles. 21. 5-MeO-DMT for use according to embodiments 18 to 20, used in the form of the free base. 22. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 18-21, wherein the dosage of 5-MeO-DMT or a pharma- ceutically acceptable salt administered to the patient is inhaled in one breath. 23. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-22, wherein the clinical response, as measured by a score of at least "marked improvement" in the Clinical Global Impression-Improvement (CGI-I) score or the Patient Global Impression-Improvement (PGI-I) score, occurs within about 2 hours after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 24. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 23, wherein the clinical response, as determined by a score of at least "marked improvement" in the CGI-I score or PGI-I score, persists for at least 6 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 25. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 24, in which the clinical response, as determined by a score of at least "marked improvement" in the CGI-I score or PGI-I score, persists for at least 14 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 26. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 25, in which the clinical response, as determined by a score of at least "marked improvement" in the CGI-I score or PGI-I score, persists for at least 28 days after the last administration of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof. 27. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-26, wherein a clinical response, as determined by at least a 35% improvement in the YBOCS compared to the pre-treatment score, occurs within about 7 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 28. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-27, wherein remission of symptoms of obsessive-compulsive disorder, as determined by a score of 12 or less on the YBOCS, occurs within about 7 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 29. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-28, in which the clinical response, as measured by at least a 35% improvement in the YBOCS compared to the pre-treatment score, is sustained for at least 14 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 30. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-29, wherein a clinical response, as determined by at least a 50% improvement in the YBOCS compared to the pre-treatment score, is present 7 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 31. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-30, in which the patient is in remission of symptoms of obsessive-compulsive disorder as determined by a score of 12 or less on the YBOCS 7 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 32. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-31, in which the clinical response, as measured by at least a 35% improvement in the YBOCS compared to the pre-treatment score, is sustained for at least 21 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 33. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-32, wherein a clinical response, as determined by at least a 50% improvement in the YBOCS compared to the pre-treatment score, is present 14 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 34. 5-MeO-DMT or a pharma- ceutical acceptable salt thereof for use according to embodiments 1-33, in which the patient is in remission of symptoms of obsessive-compulsive disorder as determined by a score of 12 or less on the YBOCS 14 days after the last administration of 5-MeO-DMT or a pharma- ceutical acceptable salt thereof. 35. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-34, in which the clinical response, as measured by at least a 35% improvement in the YBOCS compared to the pre-treatment score, is sustained for at least 28 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 36. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-35, wherein a clinical response, as determined by at least a 50% improvement in the YBOCS compared to the pre-treatment score, is present 28 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 37. 5-MeO-DMT or a pharma- ceutical acceptable salt thereof for use according to embodiments 1-36, in which the patient is in remission of symptoms of obsessive-compulsive disorder as determined by a score of 12 or less on the YBOCS 28 days after the last administration of 5-MeO-DMT or a pharma- ceutical acceptable salt thereof. 38. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-37, administered in one or more treatment blocks. 39. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 38, wherein the subsequent treatment block is administered at least about 6 days after the preceding treatment block. 40. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 38-39, wherein the first treatment block comprises administration of 5-MeO-DMT or a salt thereof as defined in embodiments 9-22. 41. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 38-40, wherein the first treatment block comprises 1 to 7 administrations of the dose at which the patient experienced a peak experience, with no less than about 1 hour and no more than about 24 hours between each administration. 42. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 38-41, wherein each treatment block comprises 1 to 7 administrations, and the interval between each administration within each treatment block is from about 1 hour to about 24 hours. 43. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 38 or 42, wherein the second and any subsequent treatment blocks comprise one or more administrations of the maximum dose of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof administered during the first treatment block. 44. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof is administered in two or more treatment blocks, wherein in a first treatment block, 5-MeO-DMT or a salt thereof is administered at a first dosage for a first administration, and 5-MeO-DMT or a salt thereof is administered in 0 to 6 subsequent administrations in the first treatment block, each subsequent administration using a higher dosage than the previous administration unless the patient experiences a peak psychedelic experience, and the occurrence of a peak psychedelic experience is determined by the highest possible score on each of the four subscales (mystical, positive mood, transcendence in time and space, and indescribability) of the 30-item Revised Mystical Experiences Questionnaire (MEQ30). or by achievement of at least 60% of the highest possible score on the Ocean Sensation (OBN) facet of the Altered States of Consciousness (ASC) questionnaire, the interval between two administrations in a first treatment block is greater than or equal to about 1 hour and less than or equal to about 24 hours, the second and any subsequent treatment blocks comprise a single administration of the maximum dose of 5-MeO-DMT or a pharmacologic acceptable salt thereof administered during the first treatment block, and the subsequent treatment block is administered at least about 6 days after the preceding treatment block. 45. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof is administered in two or more treatment blocks, wherein in a first treatment block, 5-MeO-DMT or a salt thereof is administered in a first dosage for a first administration, and 5-MeO-DMT or a salt thereof is administered in 0 to 6 subsequent administrations in the first treatment block, each subsequent administration using a higher dosage than the previous administration unless the patient experiences a peak psychedelic experience, and the occurrence of a peak psychedelic experience is associated with a peak psychedelic experience quality of at least 75. 5-MeO-DMT or a pharmacologic acceptable salt thereof for use according to embodiments 1-37, wherein the interval between two administrations during the first treatment block is greater than or equal to about 1 hour and less than or equal to about 24 hours, the second and any subsequent treatment blocks comprise a single administration of the maximum dose of 5-MeO-DMT or a pharmacologic acceptable salt thereof administered during the first treatment block, and the subsequent treatment block is administered at least about 6 days after the preceding treatment block.

[0145] Embodiments Relating to Treatment of Anorexia Nervosa 1. 5-Methoxy-N,N-dimethyltryptamine (5-MeO-DMT) or a pharma- ceutically acceptable salt thereof, for use in the treatment of a patient diagnosed with anorexia nervosa by a qualified professional in accordance with accepted medical practice. 2. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use as described in embodiment 1, wherein the disorder is diagnosed in accordance with the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5) published by the American Psychiatric Association. 3. The patient has a weight of 17 kg / m 2 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 1 or 2, in a patient suffering from moderate or severe or extreme anorexia nervosa as indicated by a body mass index of less than 100 mg / kg. 4. The patient has a weight of 16 kg / m 2 5-MeO-DMT, or a pharma- ceutically acceptable salt thereof, for use according to embodiment 3, in patients suffering from severe or extreme anorexia nervosa as indicated by a body mass index of less than 0.05 mg / kg. 5. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-4, wherein the patient is diagnosed with treatment-resistant anorexia nervosa. 6. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 5, wherein the patient further suffers from suicidal thoughts. 7. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 6, wherein the patient suffers from suicidal thoughts with the intent to carry them out. 8. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-7, wherein the patient is at imminent risk of suicide. 9. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-8, wherein the 5-MeO-DMT or salt thereof is administered in a dose or dosage regimen that causes the patient to experience a peak psychedelic experience. 10. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-9, wherein a dose of about 4 mg to about 20 mg of 5-MeO-DMT is administered, or an equimolar amount of a pharma- ceutically acceptable salt is administered instead of 5-MeO-DMT. 11. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-9, wherein a dosage of about 6 mg or about 12 mg or about 18 mg is administered, or an equimolar amount of a pharma- ceutically acceptable salt is administered instead of 5-MeO-DMT. 12. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-10, wherein 5-MeO-DMT or a salt thereof is administered in a first dosage for a first administration, and 5-MeO-DMT or a salt thereof is administered in 0-6 subsequent administrations, each subsequent administration using a higher dosage than the previous administration unless the patient experiences a peak psychedelic experience. 13. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-12, wherein 5-MeO-DMT is administered at a dosage of about 2 mg to about 8 mg for a first administration, then increased to a dosage of about 8 mg to about 14 mg for a second administration, unless the patient has already experienced a peak psychedelic experience, and then increased to a dosage of about 14 mg to about 20 mg for a third administration, unless the patient has already experienced a peak psychedelic experience, or an equimolar amount of a pharma- ceutically acceptable salt is administered in place of 5-MeO-DMT. 14. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 13, wherein the first dose of 5-MeO-DMT is about 6 mg, the second dose of 5-MeO-DMT is about 12 mg, and the third dose of 5-MeO-DMT is about 18 mg, or an equimolar amount of a pharma- ceutically acceptable salt is administered instead of 5-MeO-DMT. 15. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 12-14, wherein the interval between two administrations is at least 1 hour and at most 24 hours, for example about 2-4 hours. 16. 5-MeO-DMT or a pharma- tically acceptable salt thereof for use according to embodiments 9 to 15, wherein the occurrence of a peak psychedelic experience is determined by the achievement of at least 60% of the highest possible score on each of the four subscales (mystical, positive mood, transcendence of time and space, and ineffability) of the 30-item Revised Mystical Experiences Questionnaire (MEQ30), or by the achievement of at least 60% of the highest possible score on the Oceanic Feeling (OBN) facet of the Altered States of Consciousness (ASC) Questionnaire, or by the achievement of a total score on the Peak Psychedelic Experiences Questionnaire (PPEQ) of at least 75. 17. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 16, wherein the occurrence of a peak psychedelic experience is identified by the achievement of a Peak Psychedelic Experience Questionnaire (PPEQ) total score of at least 75. 18. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to any of the previous embodiments, administered by inhalation. 19. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 18, wherein the 5-MeO-DMT or a pharma- ceutically acceptable salt thereof is administered in the form of an aerosol comprising (a) a pharma- ceutically acceptable gas, and (b) aerosol particles of 5-methoxy-N,N-dimethyltryptamine (5-MeO-DMT) or a pharma- ceutically acceptable salt thereof, wherein the aerosol has a mass density of the aerosol particles of about 0.5 mg / l to about 12.5 mg / l. 20. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 19, wherein the aerosol is generated by a) exposing a thin layer of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof formed on a solid support to thermal energy, and b) passing air through the thin layer to create aerosol particles. 21. 5-MeO-DMT for use according to embodiments 18 to 20, used in the form of the free base. 22. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 18-21, wherein the dosage of 5-MeO-DMT or a pharma- ceutically acceptable salt administered to the patient is inhaled in one breath. 23. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-22, wherein the clinical response, as measured by a score of at least "marked improvement" in the Clinical Global Impression-Improvement (CGI-I) score or the Patient Global Impression-Improvement (PGI-I) score, occurs within about 2 hours after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 24. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 23, wherein the clinical response, as determined by a score of at least "marked improvement" in the CGI-I score or PGI-I score, persists for at least 6 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 25. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 24, in which the clinical response, as determined by a score of at least "marked improvement" in the CGI-I score or PGI-I score, persists for at least 14 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 26. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 25, in which the clinical response, as determined by a score of at least "marked improvement" in the CGI-I score or PGI-I score, persists for at least 28 days after the last administration of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof. An increase in body mass index of at least 1 kg / m compared with the body mass index before administration of 27.5-MeO-DMT 2 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-26, wherein the clinical response, as measured by an increase in β-catenin, occurs within about 28 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 28. At least 18.5kg / m 2 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-27, wherein remission of anorexia nervosa, as measured by a body mass index of 0.1 to 0.2, occurs within about 56 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. An increase in body mass index of at least 1 kg / m compared with the body mass index before administration of 29.5-MeO-DMT 2 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 28, wherein the clinical response, as measured by an increase in serotonin, persists for at least 56 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 30. An increase in body mass index of at least 1 kg / m compared with the body mass index before administration of 5-MeO-DMT 2 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-29, wherein the clinical response, as measured by an increase in serotonin, is present 28 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 31. The patient has a mean body weight of at least 18.5 kg / m2 56 days after the last dose of 5-MeO-DMT or a pharmacologic acceptable salt thereof. 2 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 30, wherein the patient is in remission from anorexia nervosa as determined by a body mass index of 0.1 or greater. 32. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-31, administered in one or more treatment blocks. 33. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 32, wherein the subsequent treatment block is administered at least about 6 days after the preceding treatment block. 34. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 32-33, wherein the first treatment block comprises administration of 5-MeO-DMT or a salt thereof as defined in embodiments 9-22. 35. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 32-34, wherein the first treatment block comprises 1 to 7 administrations of the dose at which the patient experienced the peak experience, with no less than about 1 hour and no more than about 24 hours between each administration. 36. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 32-35, wherein each treatment block comprises 1 to 7 administrations, and the interval between each administration within each treatment block is from about 1 hour to about 24 hours. 37. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 32 or 36, wherein the second and any subsequent treatment blocks comprise one or more administrations of the maximum dose of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof administered during the first treatment block. 38. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof is administered in two or more treatment blocks, wherein in a first treatment block, 5-MeO-DMT or a salt thereof is administered at a first dosage for a first administration, and 5-MeO-DMT or a salt thereof is administered in 0 to 6 subsequent administrations in the first treatment block, each subsequent administration using a higher dosage than the previous administration unless the patient experiences a peak psychedelic experience, and the occurrence of a peak psychedelic experience is determined by the highest possible score on each of the four subscales (mystical, positive mood, transcendence in time and space, and indescribability) of the 30-item Revised Mystical Experiences Questionnaire (MEQ30). or by achievement of at least 60% of the highest possible score on the Ocean Sensation (OBN) facet of the Altered States of Consciousness (ASC) questionnaire, the interval between two administrations in a first treatment block is greater than or equal to about 1 hour and less than or equal to about 24 hours, the second and any subsequent treatment blocks comprise a single administration of the maximum dose of 5-MeO-DMT or a pharmacologic acceptable salt thereof administered during the first treatment block, and the subsequent treatment block is administered at least about 6 days after the preceding treatment block. 39. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof is administered in two or more treatment blocks, wherein in a first treatment block, 5-MeO-DMT or a salt thereof is administered in a first dosage for a first administration, and 5-MeO-DMT or a salt thereof is administered in 0 to 6 subsequent administrations in the first treatment block, each subsequent administration using a higher dosage than the previous administration unless the patient experiences a peak psychedelic experience, and the occurrence of a peak psychedelic experience is associated with at least 75 peak psychedelic experience qualities. 5-MeO-DMT or a pharmacologic acceptable salt thereof for use according to embodiments 1-31, wherein the interval between two administrations during the first treatment block is greater than or equal to about 1 hour and less than or equal to about 24 hours, the second and any subsequent treatment blocks comprise a single administration of the maximum dose of 5-MeO-DMT or a pharmacologic acceptable salt thereof administered during the first treatment block, and the subsequent treatment block is administered at least about 6 days after the preceding treatment block.

[0146] Embodiments Relating to Treatment of Bulimia Nervosa 1. 5-Methoxy-N,N-dimethyltryptamine (5-MeO-DMT) or a pharma- ceutically acceptable salt thereof, for use in the treatment of patients diagnosed with bulimia nervosa by a qualified professional in accordance with accepted medical practice. 2. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use as described in embodiment 1, wherein the disorder is diagnosed in accordance with the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5) published by the American Psychiatric Association. 3. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 1 or 2, wherein the patient suffers from moderate or severe bulimia nervosa as manifested by 4 or more binge eating and vomiting episodes per week. 4. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use as described in embodiment 3, wherein the patient suffers from severe bulimia nervosa as manifested by 8 or more binge eating and vomiting episodes per week. 5. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-4, wherein the patient is diagnosed with treatment-resistant bulimia nervosa. 6. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 5, wherein the patient further suffers from suicidal thoughts. 7. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 6, wherein the patient suffers from suicidal thoughts with the intent to carry them out. 8. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-7, wherein the patient is at imminent risk of suicide. 9. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-8, wherein the 5-MeO-DMT or salt thereof is administered in a dose or dosage regimen that causes the patient to experience a peak psychedelic experience. 10. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-9, wherein a dose of about 4 mg to about 20 mg of 5-MeO-DMT is administered, or an equimolar amount of a pharma- ceutically acceptable salt is administered instead of 5-MeO-DMT. 11. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-9, wherein a dosage of about 6 mg or about 12 mg or about 18 mg is administered, or an equimolar amount of a pharma- ceutically acceptable salt is administered instead of 5-MeO-DMT. 12. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-10, wherein 5-MeO-DMT or a salt thereof is administered in a first dosage for a first administration, and 5-MeO-DMT or a salt thereof is administered in 0-6 subsequent administrations, each subsequent administration using a higher dosage than the previous administration unless the patient experiences a peak psychedelic experience. 13. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-12, wherein 5-MeO-DMT is administered at a dosage of about 2 mg to about 8 mg for a first administration, then increased to a dosage of about 8 mg to about 14 mg for a second administration, unless the patient has already experienced a peak psychedelic experience, and then increased to a dosage of about 14 mg to about 20 mg for a third administration, unless the patient has already experienced a peak psychedelic experience, or an equimolar amount of a pharma- ceutically acceptable salt is administered in place of 5-MeO-DMT. 14. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 13, wherein the first dose of 5-MeO-DMT is about 6 mg, the second dose of 5-MeO-DMT is about 12 mg, and the third dose of 5-MeO-DMT is about 18 mg, or an equimolar amount of a pharma- ceutically acceptable salt is administered instead of 5-MeO-DMT. 15. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 12-14, wherein the interval between two administrations is at least 1 hour and at most 24 hours, for example about 2-4 hours. 16. 5-MeO-DMT or a pharma- tically acceptable salt thereof for use according to embodiments 9 to 15, wherein the occurrence of a peak psychedelic experience is determined by the achievement of at least 60% of the highest possible score on each of the four subscales (mystical, positive mood, transcendence of time and space, and ineffability) of the 30-item Revised Mystical Experiences Questionnaire (MEQ30), or by the achievement of at least 60% of the highest possible score on the Oceanic Feeling (OBN) facet of the Altered States of Consciousness (ASC) Questionnaire, or by the achievement of a total score on the Peak Psychedelic Experiences Questionnaire (PPEQ) of at least 75. 17. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 16, wherein the occurrence of a peak psychedelic experience is identified by the achievement of a Peak Psychedelic Experience Questionnaire (PPEQ) total score of at least 75. 18. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to any of the previous embodiments, administered by inhalation. 19. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 18, wherein the 5-MeO-DMT or a pharma- ceutically acceptable salt thereof is administered in the form of an aerosol comprising (a) a pharma- ceutically acceptable gas, and (b) aerosol particles of 5-methoxy-N,N-dimethyltryptamine (5-MeO-DMT) or a pharma- ceutically acceptable salt thereof, wherein the aerosol has a mass density of the aerosol particles of about 0.5 mg / l to about 12.5 mg / l. 20. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 19, wherein the aerosol is generated by a) exposing a thin layer of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof formed on a solid support to thermal energy, and b) passing air through the thin layer to create aerosol particles. 21. 5-MeO-DMT for use according to embodiments 18 to 20, used in the form of the free base. 22. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 18-21, wherein the dosage of 5-MeO-DMT or a pharma- ceutically acceptable salt administered to the patient is inhaled in one breath. 23. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-22, wherein the clinical response, as measured by a score of at least "marked improvement" in the Clinical Global Impression-Improvement (CGI-I) score or the Patient Global Impression-Improvement (PGI-I) score, occurs within about 2 hours after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 24. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 23, wherein the clinical response, as determined by a score of at least "marked improvement" in the CGI-I score or PGI-I score, persists for at least 6 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 25. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 24, in which the clinical response, as determined by a score of at least "marked improvement" in the CGI-I score or PGI-I score, persists for at least 14 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 26. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 25, in which the clinical response, as determined by a score of at least "marked improvement" in the CGI-I score or PGI-I score, persists for at least 28 days after the last administration of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof. 27. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 26, wherein the clinical response, as determined by at least a 50% reduction in the number of binge eating and vomiting episodes per week compared to the number of binge eating and vomiting episodes per week prior to administration of 5-MeO-DMT, occurs within about 7 days after the last administration of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof. 28. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-27, wherein remission of symptoms of bulimia nervosa, as measured by 0 binge eating and vomiting episodes per week, occurs within about 14 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 29. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 28, wherein the clinical response, as measured by at least a 50% reduction in the number of binge eating and vomiting episodes per week compared to the number of binge eating and vomiting episodes per week prior to administration of 5-MeO-DMT, persists for at least 14 days after the last administration of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof. 30. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-29, wherein a clinical response, as determined by at least a 75% reduction in the number of binge eating and vomiting episodes per week compared to the number of binge eating and vomiting episodes per week prior to administration of 5-MeO-DMT, is present 7 days after the last administration of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof. 31. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-30, wherein the patient is in remission of symptoms of bulimia nervosa as determined by 0 binge eating and vomiting episodes per week 14 days after the last administration of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof. 32. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 31, wherein the clinical response, as measured by at least a 50% reduction in the number of binge eating and vomiting episodes per week compared to the number of binge eating and vomiting episodes per week prior to administration of 5-MeO-DMT, persists for at least 21 days after the last administration of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof. 33. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-32, wherein a clinical response, as determined by at least a 75% reduction in the number of binge eating and vomiting episodes per week compared to the number of binge eating and vomiting episodes per week prior to administration of 5-MeO-DMT, is present 14 days after the last administration of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof. 34. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-33, in which the patient is in remission of symptoms of bulimia nervosa as determined by 0 binge eating and vomiting episodes per week 21 days after the last administration of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof. 35. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 34, wherein the clinical response, as measured by at least a 50% reduction in the number of binge eating and vomiting episodes per week compared to the number of binge eating and vomiting episodes per week prior to administration of 5-MeO-DMT, persists for at least 28 days after the last administration of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof. 36. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 35, wherein a clinical response, as determined by at least a 75% reduction in the number of binge eating and vomiting episodes per week compared to the number of binge eating and vomiting episodes per week prior to administration of 5-MeO-DMT, is present 28 days after the last administration of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof. 37. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-36, wherein the patient is in remission of symptoms of bulimia nervosa as determined by 0 binge eating and vomiting episodes per week 28 days after the last administration of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof. 38. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-37, administered in one or more treatment blocks. 39. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 38, wherein the subsequent treatment block is administered at least about 6 days after the preceding treatment block. 40. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 38-39, wherein the first treatment block comprises administration of 5-MeO-DMT or a salt thereof as defined in embodiments 9-22. 41. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 38-40, wherein the first treatment block comprises 1 to 7 administrations of the dose at which the patient experienced a peak experience, with no less than about 1 hour and no more than about 24 hours between each administration. 42. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 38-41, wherein each treatment block comprises 1 to 7 administrations, and the interval between each administration within each treatment block is from about 1 hour to about 24 hours. 43. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 38 or 42, wherein the second and any subsequent treatment blocks comprise one or more administrations of the maximum dose of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof administered during the first treatment block. 44. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof is administered in two or more treatment blocks, wherein in a first treatment block, 5-MeO-DMT or a salt thereof is administered at a first dosage for a first administration, and 5-MeO-DMT or a salt thereof is administered in 0 to 6 subsequent administrations in the first treatment block, each subsequent administration using a higher dosage than the previous administration unless the patient experiences a peak psychedelic experience, and the occurrence of a peak psychedelic experience is determined by the highest possible score on each of the four subscales (mystical, positive mood, transcendence in time and space, and indescribability) of the 30-item Revised Mystical Experiences Questionnaire (MEQ30). or by achievement of at least 60% of the highest possible score on the Ocean Sensation (OBN) facet of the Altered States of Consciousness (ASC) questionnaire, the interval between two administrations in a first treatment block is greater than or equal to about 1 hour and less than or equal to about 24 hours, the second and any subsequent treatment blocks comprise a single administration of the maximum dose of 5-MeO-DMT or a pharmacologic acceptable salt thereof administered during the first treatment block, and the subsequent treatment block is administered at least about 6 days after the preceding treatment block. 45. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof is administered in two or more treatment blocks, wherein in a first treatment block, 5-MeO-DMT or a salt thereof is administered in a first dosage for a first administration, and 5-MeO-DMT or a salt thereof is administered in 0 to 6 subsequent administrations in the first treatment block, each subsequent administration using a higher dosage than the previous administration unless the patient experiences a peak psychedelic experience, and the occurrence of a peak psychedelic experience is associated with a peak psychedelic experience quality of at least 75. 5-MeO-DMT or a pharmacologic acceptable salt thereof for use according to embodiments 1-37, wherein the interval between two administrations during the first treatment block is greater than or equal to about 1 hour and less than or equal to about 24 hours, the second and any subsequent treatment blocks comprise a single administration of the maximum dose of 5-MeO-DMT or a pharmacologic acceptable salt thereof administered during the first treatment block, and the subsequent treatment block is administered at least about 6 days after the preceding treatment block.

[0147] Embodiments Relating to Treatment of Binge Eating Disorder 1. 5-Methoxy-N,N-dimethyltryptamine (5-MeO-DMT) or a pharma- ceutically acceptable salt thereof, for use in the treatment of a patient diagnosed with binge eating disorder by a qualified professional in accordance with accepted medical practice. 2. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use as described in embodiment 1, wherein the disorder is diagnosed in accordance with the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5) published by the American Psychiatric Association. 3. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 1 or 2, wherein the patient suffers from moderate or severe binge eating disorder as manifested by 4 or more binge eating episodes per week. 4. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 3, wherein the patient suffers from a severe binge eating disorder as manifested by 8 or more binge eating episodes per week. 5. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-4, wherein the patient is diagnosed with treatment-resistant binge eating disorder. 6. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 5, wherein the patient further suffers from suicidal thoughts. 7. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 6, wherein the patient suffers from suicidal thoughts with the intent to carry them out. 8. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-7, wherein the patient is at imminent risk of suicide. 9. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-8, administered in a dose or dosage regimen that causes the patient to experience a peak psychedelic experience. 10. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-9, wherein a dose of about 4 mg to about 20 mg of 5-MeO-DMT is administered, or an equimolar amount of a pharma- ceutically acceptable salt is administered instead of 5-MeO-DMT. 11. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-9, wherein a dosage of about 6 mg or about 12 mg or about 18 mg is administered, or an equimolar amount of a pharma- ceutically acceptable salt is administered instead of 5-MeO-DMT. 12. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-10, wherein 5-MeO-DMT or a salt thereof is administered in a first dosage for a first administration, and 5-MeO-DMT or a salt thereof is administered in 0-6 subsequent administrations, each subsequent administration using a higher dosage than the previous administration unless the patient experiences a peak psychedelic experience. 13. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-12, wherein 5-MeO-DMT is administered at a dosage of about 2 mg to about 8 mg for a first administration, then increased to a dosage of about 8 mg to about 14 mg for a second administration, unless the patient has already experienced a peak psychedelic experience, and then increased to a dosage of about 14 mg to about 20 mg for a third administration, unless the patient has already experienced a peak psychedelic experience, or an equimolar amount of a pharma- ceutically acceptable salt is administered in place of 5-MeO-DMT. 14. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 13, wherein the first dose of 5-MeO-DMT is about 6 mg, the second dose of 5-MeO-DMT is about 12 mg, and the third dose of 5-MeO-DMT is about 18 mg, or an equimolar amount of a pharma- ceutically acceptable salt is administered instead of 5-MeO-DMT. 15. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 12-14, wherein the interval between two administrations is at least 1 hour and at most 24 hours, for example about 2-4 hours. 16. 5-MeO-DMT or a pharma- tically acceptable salt thereof for use according to embodiments 9 to 15, wherein the occurrence of a peak psychedelic experience is determined by the achievement of at least 60% of the highest possible score on each of the four subscales (mystical, positive mood, transcendence of time and space, and ineffability) of the 30-item Revised Mystical Experiences Questionnaire (MEQ30), or by the achievement of at least 60% of the highest possible score on the Oceanic Feeling (OBN) facet of the Altered States of Consciousness (ASC) Questionnaire, or by the achievement of a total score on the Peak Psychedelic Experiences Questionnaire (PPEQ) of at least 75. 17. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 16, wherein the occurrence of a peak psychedelic experience is identified by the achievement of a Peak Psychedelic Experience Questionnaire (PPEQ) total score of at least 75. 18. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to any of the previous embodiments, administered by inhalation. 19. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 18, wherein the 5-MeO-DMT or a pharma- ceutically acceptable salt thereof is administered in the form of an aerosol comprising (a) a pharma- ceutically acceptable gas, and (b) aerosol particles of 5-methoxy-N,N-dimethyltryptamine (5-MeO-DMT) or a pharma- ceutically acceptable salt thereof, wherein the aerosol has a mass density of the aerosol particles of about 0.5 mg / l to about 12.5 mg / l. 20. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 19, wherein the aerosol is generated by a) exposing a thin layer of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof formed on a solid support to thermal energy, and b) passing air through the thin layer to create aerosol particles. 21. 5-MeO-DMT for use according to embodiments 18 to 20, used in the form of the free base. 22. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 18-21, wherein the dosage of 5-MeO-DMT or a pharma- ceutically acceptable salt administered to the patient is inhaled in one breath. 23. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-22, wherein the clinical response, as measured by a score of at least "marked improvement" in the Clinical Global Impression-Improvement (CGI-I) score or the Patient Global Impression-Improvement (PGI-I) score, occurs within about 2 hours after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 24. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 23, wherein the clinical response, as determined by a score of at least "marked improvement" in the CGI-I score or PGI-I score, persists for at least 6 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 25. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 24, in which the clinical response, as determined by a score of at least "marked improvement" in the CGI-I score or PGI-I score, persists for at least 14 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 26. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 25, in which the clinical response, as determined by a score of at least "marked improvement" in the CGI-I score or PGI-I score, persists for at least 28 days after the last administration of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof. 27. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-26, wherein the clinical response, as determined by at least a 50% reduction in the number of binge eating episodes per week compared to the number of binge eating episodes per week prior to administration of 5-MeO-DMT, occurs within about 7 days after the last administration of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof. 28. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-27, wherein remission of symptoms of binge eating disorder, as measured by 0 binge eating episodes per week, occurs within about 14 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 29. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 28, wherein the clinical response, as measured by at least a 50% reduction in the number of binge eating episodes per week compared to the number of binge eating episodes per week prior to administration of 5-MeO-DMT, persists for at least 14 days after the last administration of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof. 30. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-29, wherein a clinical response, as determined by at least a 75% reduction in the number of binge eating episodes per week compared to the number of binge eating episodes per week prior to administration of 5-MeO-DMT, is present 7 days after the last administration of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof. 31. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-30, wherein the patient is in remission of symptoms of binge eating disorder as determined by 0 binge eating episodes per week 14 days after the last administration of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof. 32. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-31, wherein the clinical response, as measured by at least a 50% reduction in the number of binge eating episodes per week compared to the number of binge eating episodes per week prior to administration of 5-MeO-DMT, persists for at least 21 days after the last administration of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof. 33. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-32, wherein a clinical response, as determined by at least a 75% reduction in the number of binge eating episodes per week compared to the number of binge eating episodes per week prior to administration of 5-MeO-DMT, is present 14 days after the last administration of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof. 34. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-33, in which the patient is in remission of symptoms of binge eating disorder as measured by 0 binge eating episodes per week 21 days after the last administration of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof. 35. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 34, wherein the clinical response, as measured by at least a 50% reduction in the number of binge eating episodes per week compared to the number of binge eating episodes per week prior to administration of 5-MeO-DMT, persists for at least 28 days after the last administration of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof. 36. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-35, wherein a clinical response, as determined by at least a 75% reduction in the number of binge eating episodes per week compared to the number of binge eating episodes per week prior to administration of 5-MeO-DMT, is present 28 days after the last administration of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof. 37. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-36, in which the patient is in remission of symptoms of binge eating disorder as determined by 0 binge eating episodes per week 28 days after the last administration of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof. 38. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-37, administered in one or more treatment blocks. 39. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 38, wherein the subsequent treatment block is administered at least about 6 days after the preceding treatment block. 40. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 38-39, wherein the first treatment block comprises administration of 5-MeO-DMT or a salt thereof as defined in embodiments 9-22. 41. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 38-40, wherein the first treatment block comprises 1 to 7 administrations of the dose at which the patient experienced a peak experience, with no less than about 1 hour and no more than about 24 hours between each administration. 42. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 38-41, wherein each treatment block comprises 1 to 7 administrations, and the interval between each administration within each treatment block is from about 1 hour to about 24 hours. 43. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 38 or 42, wherein the second and any subsequent treatment blocks comprise one or more administrations of the maximum dose of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof administered during the first treatment block. 44. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof is administered in two or more treatment blocks, wherein in a first treatment block, 5-MeO-DMT or a salt thereof is administered at a first dosage for a first administration, and 5-MeO-DMT or a salt thereof is administered in 0 to 6 subsequent administrations in the first treatment block, each subsequent administration using a higher dosage than the previous administration unless the patient experiences a peak psychedelic experience, and the occurrence of a peak psychedelic experience is determined by the highest possible score on each of the four subscales (mystical, positive mood, transcendence in time and space, and indescribability) of the 30-item Revised Mystical Experiences Questionnaire (MEQ30). or by achievement of at least 60% of the highest possible score on the Ocean Sensation (OBN) facet of the Altered States of Consciousness (ASC) questionnaire, the interval between two administrations in a first treatment block is greater than or equal to about 1 hour and less than or equal to about 24 hours, the second and any subsequent treatment blocks comprise a single administration of the maximum dose of 5-MeO-DMT or a pharmacologic acceptable salt thereof administered during the first treatment block, and the subsequent treatment block is administered at least about 6 days after the preceding treatment block. 45. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof is administered in two or more treatment blocks, wherein in a first treatment block, 5-MeO-DMT or a salt thereof is administered in a first dosage for a first administration, and 5-MeO-DMT or a salt thereof is administered in 0 to 6 subsequent administrations in the first treatment block, each subsequent administration using a higher dosage than the previous administration unless the patient experiences a peak psychedelic experience, and the occurrence of a peak psychedelic experience is associated with a peak psychedelic experience quality of at least 75. 5-MeO-DMT or a pharmacologic acceptable salt thereof for use according to embodiments 1-37, wherein the interval between two administrations during the first treatment block is greater than or equal to about 1 hour and less than or equal to about 24 hours, the second and any subsequent treatment blocks comprise a single administration of the maximum dose of 5-MeO-DMT or a pharmacologic acceptable salt thereof administered during the first treatment block, and the subsequent treatment block is administered at least about 6 days after the preceding treatment block.

[0148] Embodiments Related to Treatment of Psychoactive Substance Abuse 1. 5-Methoxy-N,N-dimethyltryptamine (5-MeO-DMT) or a pharma- ceutically acceptable salt thereof, for use in the treatment of patients diagnosed with psychoactive substance abuse by a qualified professional in accordance with accepted medical practice. 2. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use as described in embodiment 1, wherein the disorder is diagnosed in accordance with the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5) published by the American Psychiatric Association. 3. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 1 or 2, wherein the patient suffers from moderate or severe psychoactive substance abuse as indicated by the presence of at least four of the eleven DSM-5 diagnostic criteria for substance use disorder. 4. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 3, wherein the patient suffers from severe psychoactive substance abuse as indicated by the presence of at least six of the eleven DSM-5 diagnostic criteria for a substance use disorder. 5. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-4, wherein the patient is diagnosed with treatment-resistant psychoactive substance abuse. 6. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 5, wherein the patient further suffers from suicidal thoughts. 7. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 6, wherein the patient suffers from suicidal thoughts with the intent to carry them out. 8. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-7, wherein the patient is at imminent risk of suicide. 9. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-8, wherein the 5-MeO-DMT or salt thereof is administered in a dose or dosage regimen that causes the patient to experience a peak psychedelic experience. 10. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-9, wherein a dose of about 4 mg to about 20 mg of 5-MeO-DMT is administered, or an equimolar amount of a pharma- ceutically acceptable salt is administered instead of 5-MeO-DMT. 11. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-9, wherein a dosage of about 6 mg or about 12 mg or about 18 mg is administered, or an equimolar amount of a pharma- ceutically acceptable salt is administered instead of 5-MeO-DMT. 12. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-10, wherein 5-MeO-DMT or a salt thereof is administered in a first dosage for a first administration, and 5-MeO-DMT or a salt thereof is administered in 0-6 subsequent administrations, each subsequent administration using a higher dosage than the previous administration unless the patient experiences a peak psychedelic experience. 13. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-12, wherein 5-MeO-DMT is administered at a dosage of about 2 mg to about 8 mg for a first administration, then increased to a dosage of about 8 mg to about 14 mg for a second administration, unless the patient has already experienced a peak psychedelic experience, and then increased to a dosage of about 14 mg to about 20 mg for a third administration, unless the patient has already experienced a peak psychedelic experience, or an equimolar amount of a pharma- ceutically acceptable salt is administered in place of 5-MeO-DMT. 14. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 13, wherein the first dose of 5-MeO-DMT is about 6 mg, the second dose of 5-MeO-DMT is about 12 mg, and the third dose of 5-MeO-DMT is about 18 mg, or an equimolar amount of a pharma- ceutically acceptable salt is administered instead of 5-MeO-DMT. 15. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 12-14, wherein the interval between two administrations is at least 1 hour and at most 24 hours, for example about 2-4 hours. 16. 5-MeO-DMT or a pharma- tically acceptable salt thereof for use according to embodiments 9 to 15, wherein the occurrence of a peak psychedelic experience is determined by the achievement of at least 60% of the highest possible score on each of the four subscales (mystical, positive mood, transcendence of time and space, and ineffability) of the 30-item Revised Mystical Experiences Questionnaire (MEQ30), or by the achievement of at least 60% of the highest possible score on the Oceanic Feeling (OBN) facet of the Altered States of Consciousness (ASC) Questionnaire, or by the achievement of a total score on the Peak Psychedelic Experiences Questionnaire (PPEQ) of at least 75. 17. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 16, wherein the occurrence of a peak psychedelic experience is identified by the achievement of a Peak Psychedelic Experience Questionnaire (PPEQ) total score of at least 75. 18. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to any of the previous embodiments, administered by inhalation. 19. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 18, wherein the 5-MeO-DMT or a pharma- ceutically acceptable salt thereof is administered in the form of an aerosol comprising (a) a pharma- ceutically acceptable gas, and (b) aerosol particles of 5-methoxy-N,N-dimethyltryptamine (5-MeO-DMT) or a pharma- ceutically acceptable salt thereof, wherein the aerosol has a mass density of the aerosol particles of about 0.5 mg / l to about 12.5 mg / l. 20. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 19, wherein the aerosol is generated by a) exposing a thin layer of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof formed on a solid support to thermal energy, and b) passing air through the thin layer to create aerosol particles. 21. 5-MeO-DMT for use according to embodiments 18 to 20, used in the form of the free base. 22. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 18-21, wherein the dosage of 5-MeO-DMT or a pharma- ceutically acceptable salt administered to the patient is inhaled in one breath. 23. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-22, wherein the clinical response, as measured by a score of at least "marked improvement" in the Clinical Global Impression-Improvement (CGI-I) score or the Patient Global Impression-Improvement (PGI-I) score, occurs within about 2 hours after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 24. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 23, wherein the clinical response, as determined by a score of at least "marked improvement" in the CGI-I score or PGI-I score, persists for at least 6 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 25. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 24, in which the clinical response, as determined by a score of at least "marked improvement" in the CGI-I score or PGI-I score, persists for at least 14 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 26. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 25, in which the clinical response, as determined by a score of at least "marked improvement" in the CGI-I score or PGI-I score, persists for at least 28 days after the last administration of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof. 27. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-26, wherein a clinical response, as determined by at least a 50% reduction in the number of 11 DSM-5 diagnostic criteria for substance use disorder present compared to the number prior to administration of 5-MeO-DMT, occurs within about 7 days after the last administration of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof. 28. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-27, in which remission of psychoactive substance abuse, as determined by the presence of 0 of 11 DSM-5 diagnostic criteria for substance use disorder, occurs within about 14 days after the last administration of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof. 29. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-28, wherein the clinical response, as determined by at least a 50% reduction in the number of 11 DSM-5 diagnostic criteria for substance use disorder present compared to the number prior to administration of 5-MeO-DMT, persists for at least 14 days after the last administration of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof. 30. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-29, wherein a clinical response, as determined by at least a 75% reduction in the number of 11 DSM-5 diagnostic criteria for substance use disorder present compared to the number prior to administration of 5-MeO-DMT, is present 7 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 31. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-30, in which the patient is in remission from psychoactive substance abuse as determined by the presence of 0 of 11 DSM-5 diagnostic criteria for substance use disorder 14 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 32. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-31, wherein the clinical response, as determined by at least a 50% reduction in the number of 11 DSM-5 diagnostic criteria for substance use disorder present compared to the number prior to administration of 5-MeO-DMT, persists for at least 21 days after the last administration of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof. 33. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-32, wherein a clinical response, as determined by at least a 75% reduction in the number of 11 DSM-5 diagnostic criteria for substance use disorder present compared to the number prior to administration of 5-MeO-DMT, is present 14 days after the last administration of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof. 34. 5-MeO-DMT or a pharma- ceutical acceptable salt thereof for use according to embodiments 1-33, in which the patient is in remission from psychoactive substance abuse as determined by the presence of 0 of 11 DSM-5 diagnostic criteria for substance use disorder 21 days after the last administration of 5-MeO-DMT or a pharma- ceutical acceptable salt thereof. 35. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-34, wherein the clinical response, as determined by at least a 50% reduction in the number of 11 DSM-5 diagnostic criteria for substance use disorder present compared to the number prior to administration of 5-MeO-DMT, persists for at least 28 days after the last administration of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof. 36. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-35, wherein a clinical response, as determined by at least a 75% reduction in the number of 11 DSM-5 diagnostic criteria for substance use disorder present compared to the number prior to administration of 5-MeO-DMT, is present 28 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 37. 5-MeO-DMT or a pharma- ceutical acceptable salt thereof for use according to embodiments 1-36, in which the patient is in remission from psychoactive substance abuse as determined by the presence of 0 of 11 DSM-5 diagnostic criteria for substance use disorder 28 days after the last administration of 5-MeO-DMT or a pharma-ceutical acceptable salt thereof. 38. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-37, administered in one or more treatment blocks. 39. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 38, wherein the subsequent treatment block is administered at least about 6 days after the preceding treatment block. 40. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 38-39, wherein the first treatment block comprises administration of 5-MeO-DMT or a salt thereof as defined in embodiments 9-22. 41. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 38-40, wherein the first treatment block comprises 1 to 7 administrations of the dose at which the patient experienced a peak experience, with no less than about 1 hour and no more than about 24 hours between each administration. 42. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 38-41, wherein each treatment block comprises 1 to 7 administrations, and the interval between each administration within each treatment block is from about 1 hour to about 24 hours. 43. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 38 or 42, wherein the second and any subsequent treatment blocks comprise one or more administrations of the maximum dose of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof administered during the first treatment block. 44. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof is administered in two or more treatment blocks, wherein in a first treatment block, 5-MeO-DMT or a salt thereof is administered at a first dosage for a first administration, and 5-MeO-DMT or a salt thereof is administered in 0 to 6 subsequent administrations in the first treatment block, each subsequent administration using a higher dosage than the previous administration unless the patient experiences a peak psychedelic experience, and the occurrence of a peak psychedelic experience is determined by the highest possible score on each of the four subscales (mystical, positive mood, transcendence in time and space, and indescribability) of the 30-item Revised Mystical Experiences Questionnaire (MEQ30). or by achievement of at least 60% of the highest possible score on the Ocean Sensation (OBN) facet of the Altered States of Consciousness (ASC) questionnaire, the interval between two administrations in a first treatment block is greater than or equal to about 1 hour and less than or equal to about 24 hours, the second and any subsequent treatment blocks comprise a single administration of the maximum dose of 5-MeO-DMT or a pharmacologic acceptable salt thereof administered during the first treatment block, and the subsequent treatment block is administered at least about 6 days after the preceding treatment block. 45. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof is administered in two or more treatment blocks, wherein in a first treatment block, 5-MeO-DMT or a salt thereof is administered in a first dosage for a first administration, and 5-MeO-DMT or a salt thereof is administered in 0 to 6 subsequent administrations in the first treatment block, each subsequent administration using a higher dosage than the previous administration unless the patient experiences a peak psychedelic experience, and the occurrence of a peak psychedelic experience is associated with a peak psychedelic experience quality of at least 75. 5-MeO-DMT or a pharmacologic acceptable salt thereof for use according to embodiments 1-37, wherein the interval between two administrations during the first treatment block is greater than or equal to about 1 hour and less than or equal to about 24 hours, the second and any subsequent treatment blocks comprise a single administration of the maximum dose of 5-MeO-DMT or a pharmacologic acceptable salt thereof administered during the first treatment block, and the subsequent treatment block is administered at least about 6 days after the preceding treatment block.

[0149] Embodiments relating to the treatment of major depressive disorder with suicidal ideation or imminent risk of suicide 1. 5-Methoxy-N,N-dimethyltryptamine (5-MeO-DMT) or a pharma- ceutically acceptable salt thereof, for use in the treatment of patients who have been diagnosed by a qualified professional in accordance with accepted medical practice as having major depressive disorder and who have suicidal ideation or are at imminent risk of suicide, as further diagnosed by a qualified professional in accordance with accepted medical practice. 2. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use as described in embodiment 1, wherein the disorder is diagnosed in accordance with the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5) published by the American Psychiatric Association. 3. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 1 or 2, wherein the patient suffers from moderate or severe major depressive disorder as indicated by a Montgomery-Asberg Depression Rating Scale (MADRS) score of 20 or greater, or a 17-item Hamilton Depression Rating Scale (HAM-D) score of 17 or greater, and is considered to have moderate suicidality, marked suicidality, severe suicidality, or extreme suicidality based on the Clinical Global Impression-Suicidality Severity-Revised (CGI-SS-R) scale. 4. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 3, wherein the patient suffers from a severe major depressive disorder as indicated by a MADRS score of 35 or greater, or a HAM-D score of 25 or greater, and is considered to have marked suicidality, severe suicidality, or extreme suicidality based on the Clinical Global Impression-Suicidality Severity-Revised (CGI-SS-R) scale. 5. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-4, wherein the patient is diagnosed with treatment-resistant major depressive disorder. 6. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-5, wherein the 5-MeO-DMT or salt thereof is administered in a dose or dosage regimen that causes the patient to experience a peak psychedelic experience. 7. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-6, wherein a dose of about 4 mg to about 20 mg of 5-MeO-DMT is administered, or an equimolar amount of a pharma- ceutically acceptable salt is administered instead of 5-MeO-DMT. 8. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-6, wherein a dosage of about 6 mg or about 12 mg or about 18 mg is administered, or an equimolar amount of a pharma- ceutically acceptable salt is administered instead of 5-MeO-DMT. 9. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-7, wherein 5-MeO-DMT or a salt thereof is administered in a first dosage for a first administration, and 5-MeO-DMT or a salt thereof is administered in 0-6 subsequent administrations, each subsequent administration using a higher dosage than the previous administration unless the patient experiences a peak psychedelic experience. 10. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-9, wherein 5-MeO-DMT is administered at a dosage of about 2 mg to about 8 mg for a first administration, then increased to a dosage of about 8 mg to about 14 mg for a second administration, unless the patient has already experienced a peak psychedelic experience, and then increased to a dosage of about 14 mg to about 20 mg for a third administration, unless the patient has already experienced a peak psychedelic experience, or an equimolar amount of a pharma- ceutically acceptable salt is administered in place of 5-MeO-DMT. 11. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 10, wherein the first dose of 5-MeO-DMT is about 6 mg, the second dose of 5-MeO-DMT is about 12 mg, and the third dose of 5-MeO-DMT is about 18 mg, or an equimolar amount of a pharma- ceutically acceptable salt is administered instead of 5-MeO-DMT. 12. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 9 to 11, wherein the interval between two administrations is at least 1 hour and at most 24 hours, for example about 2 to 4 hours. 13. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 6 to 12, wherein the occurrence of a peak psychedelic experience is determined by the achievement of at least 60% of the highest possible score on each of the four subscales (mystical, positive mood, transcendence of time and space, and ineffability) of the 30-item Revised Mystical Experiences Questionnaire (MEQ30), or by the achievement of at least 60% of the highest possible score on the Oceanic Feeling (OBN) facet of the Altered States of Consciousness (ASC) Questionnaire, or by the achievement of a total score on the Peak Psychedelic Experiences Questionnaire (PPEQ) of at least 75. 14. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 13, wherein the occurrence of a peak psychedelic experience is identified by the achievement of a Peak Psychedelic Experience Questionnaire (PPEQ) total score of at least 75. 15. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to any of the previous embodiments, administered by inhalation. 16. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 15, wherein the 5-MeO-DMT or a pharma- ceutically acceptable salt thereof is administered in the form of an aerosol comprising (a) a pharma- ceutically acceptable gas, and (b) aerosol particles of 5-methoxy-N,N-dimethyltryptamine (5-MeO-DMT) or a pharma- ceutically acceptable salt thereof, wherein the aerosol has a mass density of the aerosol particles of about 0.5 mg / l to about 12.5 mg / l. 17. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 16, wherein the aerosol is generated by a) exposing a thin layer of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof formed on a solid support to thermal energy, and b) passing air through the thin layer to create aerosol particles. 18. 5-MeO-DMT for use according to embodiments 15-17, used in the form of the free base. 19. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 15-18, wherein the dosage of 5-MeO-DMT or a pharma- ceutically acceptable salt administered to the patient is inhaled in one breath. 20. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-19, wherein the clinical response, as measured by a score of at least "marked improvement" on the Clinical Global Impression-Improvement (CGI-I) score or the Patient Global Impression-Improvement (PGI-I) score, occurs within about 2 hours after the last administration of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof. 21. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 20, wherein the clinical response, as determined by a score of at least "marked improvement" in the CGI-I score or PGI-I score, persists for at least 6 days after the last administration of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof. 22. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1 to 21, in which the clinical response, as determined by a score of at least "marked improvement" in the CGI-I score or PGI-I score, persists for at least 14 days after the last administration of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof. 23. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-22, in which the clinical response, as determined by a score of at least "marked improvement" in the CGI-I score or PGI-I score, persists for at least 28 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 24. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-23, wherein the clinical response, as measured by at least a 50% improvement in the MADRS or HAM-D score and a reduction of at least one level on the CGI-SS-R scale compared to the respective scores before treatment, occurs within about 2 hours after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-24, wherein remission of depressive symptoms and suicidal ideation, as measured by a MADRS score of 25.10 or less or a HAM-D score of 7 or less, and a score of no suicidality or probable suicidality on the CGI-SS-R scale, occurs within about 2 hours after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 26. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-25, in which the clinical response, as measured by at least a 50% improvement in the MADRS or HAM-D score and a reduction of at least one level on the CGI-SS-R scale compared to the respective scores before treatment, persists until at least 6 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 27. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-26, in which a clinical response, as measured by at least a 75% improvement in the MADRS or HAM-D score and a reduction of at least 2 levels on the CGI-SS-R scale compared to the respective scores before treatment, is present 7 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 28. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-27, in which the patient is in remission of depressive symptoms and suicidal ideation as determined by a MADRS score of 10 or less or a HAM-D score of 7 or less, and a score of no suicidality or possible suicidality on the CGI-SS-R scale, 7 days after the last dose of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 29. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-28, in which the clinical response, as measured by at least a 50% improvement in the MADRS or HAM-D score and a reduction of at least one level on the CGI-SS-R scale compared to the respective scores before treatment, is sustained for at least 14 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 30. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-29, in which a clinical response, as measured by at least a 75% improvement in the MADRS or HAM-D score and a reduction of at least 2 levels in the CGI-SS-R scale compared to the respective scores before treatment, is present 14 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 31. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-30, in which the patient is in remission of depressive symptoms and suicidal ideation as determined by a MADRS score of 10 or less or a HAM-D score of 7 or less, and a score of no suicidality or possible suicidality on the CGI-SS-R scale 14 days after the last dose of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 32. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-31, in which the clinical response, as measured by at least a 50% improvement in the MADRS or HAM-D score and a reduction of at least one level on the CGI-SS-R scale compared to the respective scores before treatment, is sustained for at least 28 days after the last administration of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof. 33. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-32, in which a clinical response, as measured by at least a 75% improvement in the MADRS or HAM-D score and a reduction of at least 2 levels on the CGI-SS-R scale compared to the respective scores before treatment, is present 28 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 34. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-33, in which the patient is in remission of depressive symptoms and suicidal ideation as determined by a MADRS score of 10 or less or a HAM-D score of 7 or less, and a score of no suicidality or possible suicidality on the CGI-SS-R scale, 28 days after the last dose of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof. 35. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 1-34, administered in one or more treatment blocks. 36. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 35, wherein the subsequent treatment block is administered at least about 6 days after the preceding treatment block. 37. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 35-36, wherein the first treatment block comprises administration of 5-MeO-DMT or a salt thereof as defined in embodiments 9-22. 38. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 35-37, wherein the first treatment block comprises 1 to 7 administrations of the dose at which the patient experienced the peak experience, with no less than about 1 hour and no more than about 24 hours between each administration. 39. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiments 35-38, wherein each treatment block comprises 1 to 7 administrations, and the interval between each administration within each treatment block is from about 1 hour to about 24 hours. 40. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof for use according to embodiment 35 or 39, wherein the second and any subsequent treatment blocks comprise one or more administrations of the maximum dose of 5-MeO-DMT or a pharma-ceutically acceptable salt thereof administered during the first treatment block. 41. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof is administered in two or more treatment blocks, wherein in a first treatment block, 5-MeO-DMT or a salt thereof is administered at a first dosage for a first administration, and 5-MeO-DMT or a salt thereof is administered in 0 to 6 subsequent administrations in the first treatment block, each subsequent administration using a higher dosage than the previous administration unless the patient experiences a peak psychedelic experience, and the occurrence of a peak psychedelic experience is determined by the highest possible score on each of the four subscales (mystical, positive mood, transcendence in time and space, and indescribability) of the 30-item Revised Mystical Experiences Questionnaire (MEQ30). or by achievement of at least 60% of the highest possible score on the Ocean Sensation (OBN) facet of the Altered States of Consciousness (ASC) questionnaire, the interval between two administrations in a first treatment block is greater than or equal to about 1 hour and less than or equal to about 24 hours, the second and any subsequent treatment blocks comprise a single administration of the maximum dose of 5-MeO-DMT or a pharmacologic acceptable salt thereof administered during the first treatment block, and the subsequent treatment block is administered at least about 6 days after the preceding treatment block. 42. 5-MeO-DMT or a pharma- ceutically acceptable salt thereof is administered in two or more treatment blocks, wherein in a first treatment block, 5-MeO-DMT or a salt thereof is administered in a first dosage for a first administration, and 5-MeO-DMT or a salt thereof is administered in 0 to 6 subsequent administrations in the first treatment block, each subsequent administration using a higher dosage than the previous administration unless the patient experiences a peak psychedelic experience, and the occurrence of a peak psychedelic experience is associated with at least 75 peak psychedelic experience qualities. 5-MeO-DMT or a pharmacologic acceptable salt thereof for use according to embodiments 1-34, wherein the interval between two administrations during the first treatment block is greater than or equal to about 1 hour and less than or equal to about 24 hours, the second and any subsequent treatment blocks comprise a single administration of the maximum dose of 5-MeO-DMT or a pharmacologic acceptable salt thereof administered during the first treatment block, and the subsequent treatment block is administered at least about 6 days after the preceding treatment block. EXAMPLES

[0150] The following examples are included to aid in the understanding of the invention and are not intended, and should not be construed, as limiting in any manner the invention described in the claims which follow.

[0151] [Example 1] [Example 1A] Administration of 5-MeO-DMT via inhalation Volcano Medic Vaporization System 5-MeO-DMT aerosol was generated by volatilizing the drug using a Volcano Medic Vaporization System (Storz & Bickel, Germany). The device consists of a hot air generator and a detachable valve balloon from which the patient inhales the aerosol. The hot air generator can produce an adjustable temperature between about 40°C and about 210°C, with an air flow rate of about 12 liters per minute. The central part of the device is a dosing capsule to which an appropriate dose of 5-MeO-DMT in ethanol solution is applied, the capsule is then applied to the loading chamber of the device where it is heated by hot air. The dosing capsule contains a small disk made of tightly packed stainless steel wire mesh (called a drip pad or liquid pad). The bottom and lid of the dosing capsule have holes that allow air flow through the dosing capsule. The dosing capsule and drip pad have the following characteristics based on measurements of 10 sample capsules:

[0152] [Table 1]

[0153] 5-MeO-DMT aerosol generation and administration Step 1: Prepare a stock solution of 5-MeO-DMT free base in 100% ethanol in a volumetric flask such that the target dose of 5-MeO-DMT free base to be administered to a volunteer or patient by inhalation is contained in a solution volume of 200 μl. A typical target dose is 1 mg to 25 mg of 5-MeO-DMT. For example, for a target dose of 18 mg of 5-MeO-DMT, dissolve 90 mg of 5-MeO-DMT in 100% ethanol such that the volume of the final solution is 1 ml. An aliquot of the stock solution may then be stored in a vial until further use.

[0154] Step 2: 200 μl of the solution is transferred into a dosing capsule containing a drip pad (Storz&Bickel, Germany) and the dosing capsule is closed with a lid.

[0155] Step 3: The dosing capsule filled with the 5-MeO-DMT ethanol solution is transferred to the filling chamber of the first Volcano Medic Vaporizer, which had been preheated at a temperature set at 55°C. The vaporizer airflow is then turned on for 60 seconds at a pre-set rate of approximately 12 L / min. The heated air flows through the dosing capsule, thereby evaporating the ethanol and leaving the target dose of 5-MeO-DMT in the capsule as a thin layer covering the stainless steel wire mesh. Correct preparation of the dosing capsule can be confirmed by demonstrating that the final weight gain of the capsule compared to the weight of the empty capsule is approximately equal to the target dose of 5-MeO-DMT.

[0156] Step 4: The prepared dosing capsule is removed from the filling chamber. The dosing capsule is then transferred to the filling chamber of a second Volcano Medic Vaporizer, which had been preheated at a temperature set at 210°C, with the airflow turned on for at least 5 minutes and turned off immediately before the transfer. A valved inhalation balloon (Storz&Bickel, Germany) is attached to the socket of the filling chamber, the filling chamber is sealed, and the airflow is immediately turned on at a preset rate of about 12 L / min for exactly 15 seconds and then turned off. This aerosolizes the entire dose of 5-MeO-DMT and distributes it in the inhalation balloon into approximately 3 liters of air. Correct aerosolization of 5-MeO-DMT can be confirmed by demonstrating that the capsule weight has returned to approximately its starting weight.

[0157] Step 5: The balloon is then removed from the filling chamber, which automatically closes the valve. A mouthpiece is attached to the balloon and the aerosol is ready to be administered to a volunteer or patient.

[0158] Step 6: In preparation for administration, ask the patient to first take 1-2 deep breaths and exhale completely, finishing the sequence with a deep exhale. Then, with the nozzle firmly held against the lips, inhale the entire volume of the inhalation balloon in one complete inhalation, hold the breath for 10 (± 2.5) seconds, and exhale naturally. After completing this inhalation procedure, instruct the patient to lie down.

[0159] [Example 1B] Loading of 5-MeO-DMT into Dosing Capsules and Determination of Aerosolized Dose Using a stock solution of 5-MeO-DMT stored in 200 μl aliquots in single-use vials, triplicates of dosing capsules containing target doses of 2 mg and 18 mg of 5-MeO-DMT were prepared as described in steps 1-3 of Example 1A. To confirm that the target dose of 5-MeO-DMT was accurately loaded into the dosing capsules, the baseline weight of the empty capsule was subtracted from the weight of the capsule after step 3, confirming that approximately 94% of the target dose of 5-MeO-DMT was loaded into the capsule with only minimal variation (Example 1B, Table 1). The fact that 100% of the target dose was not achieved can be explained by loss of material in the vial used to store the 5-MeO-DMT stock solution (about 2 μl volume remained) and further loss in the pipette tip used to transfer the solution from the vial to the capsule. However, such losses can be prevented by dispensing from a larger volume of the stock solution and optimizing the dispensing technique.

[0160] 5-MeO-DMT was then aerosolized from the dosing capsule as described in steps 4 and 5 of Example 1A. To confirm accurate aerosolization of 5-MeO-DMT from the dosing capsule, the weight after step 4 was subtracted from the weight after step 3 to confirm that 96%-100% of the loaded dose was aerosolized (Example 1B, Table 1).

[0161] [Table 2]

[0162] Instead of determining the loading of the target dose of 5-MeO-DMT into the dosage capsule by weighing the dosage capsule before and after formation of the 5-MeO-DMT layer, the loading can alternatively be determined by extracting the drug from the dosage capsule and analytically measuring the amount.

[0163] Instead of determining the extent to which a target dose of 5-MeO-DMT has been aerosolized from the capsule by weighing the capsule before and after formation of the 5-MeO-DMT layer and again after aerosolization, the emitted dose of 5-MeO-DMT can alternatively be determined by delivering an aerosol containing 5-MeO-DMT to a closed chamber and analytically measuring the amount of 5-MeO-DMT collected in the chamber.

[0164] [Example 1C] 5-MeO-DMT layer thickness The thickness of the 5-MeO-DMT layer covering the stainless steel wire mesh after evaporation of the ethanol solvent can be calculated as follows: 5-MeO-DMT layer thickness (μm) = 5-MeO-DMT loading dose (mg) / [5-MeO-DMT density (mg / cm 3 ) × surface area of ​​wire (cm 2 )] * 10000. The surface area of ​​the wire can be calculated based on the length of the wire (which can be measured or calculated from the weight of the wire mesh) and the diameter of the wire (which can be measured).

[0165] For the dosage capsule prepared in Example 1B, the following layer thicknesses were determined:

[0166] [Table 3]

[0167] At a target loading dose of 2 mg, 37.78 cm 2The thickness of the 5-MeO-DMT layer based on the average wire surface area can be calculated to be 0.48 μm, and at a target loading dose of 20 mg, the thickness of the 5-MeO-DMT layer can be calculated to be 4.8 μm.

[0168] [Example 1D] Determination of the rate of formation of aerosol particles and the mass density of aerosol 5-MeO-DMT The rate of formation of aerosol particles can be calculated as follows: Rate of formation of aerosol particles = Aerosolized dose / Aerosolized time. With the aerosolized dose data from Example 1B and an aerosolized time of 15 seconds, the following rates of formation of aerosol particles were determined:

[0169] [Table 4]

[0170] With a target aerosolized dose of 2 mg and an aerosolization time of 15 seconds, the rate of aerosol particle formation can be calculated to be 0.13 mg / sec, and with a target aerosolized dose of 20 mg and an aerosolization time of 15 seconds, the rate of particle formation can be calculated to be 1.33 mg / sec.

[0171] The mass density of aerosolized 5-MeO-DMT can be calculated as follows: Mass Density of Aerosolized 5-MeO-DMT = Aerosolized Dose / Aerosol Volume. With the aerosolized dose data from Example 1B and an aerosol volume of approximately 3 liters, the following mass densities of aerosolized 5-MeO-DMT were determined:

[0172] [Table 5]

[0173] At a target aerosolized dose of 2 mg in 3 liters, the mass density of the aerosolized 5-MeO-DMT can be calculated to be 0.66 mg / l, and at a target aerosolized dose of 20 mg in 3 liters, the mass density of the aerosolized 5-MeO-DMT can be calculated to be 6.66 mg / l. At a target aerosolized dose of 2 mg in 2 liters, the mass density of the aerosolized 5-MeO-DMT can be calculated to be 1 mg / l, and at a target aerosolized dose of 20 mg in 2 liters, the mass density of the aerosolized 5-MeO-DMT can be calculated to be 10 mg / l.

[0174] [Example 1E] HPLC assay for determination of purity of 5-MeO-DMT An HPLC assay was developed to allow for the determination of the purity of 5-MeO-DMT. The assay was tested for linearity and precision. Based on the results, the method was deemed fit for purpose.

[0175] The following method parameters were used:

[0176] [Table 6]

[0177] [Table 7]

[0178] Testing the Linearity of the HPLC Method: A stock solution of 5-MeO-DMT was prepared in methanol to give a nominal concentration of 0.15 mg / ml.

[0179] [Table 8]

[0180] Linearity of the HPLC method The Y-intercept % of the nominal concentration was calculated to be 0.8%. The method is considered to be linear. Testing the precision of the HPLC method:

[0181] Six sample solutions were prepared at nominal concentrations (12-18 mg in 100 ml methanol). Purity results were as follows:

[0182] [Table 9]

[0183] The acceptance criterion for purity values ​​among the six samples was 1% RSD, with the actual reading being 0.07%. Therefore, the analytical method is considered to show adequate precision.

[0184] [Example 1F] Assessment of 5-MeO-DMT aerosol purity and degradation products Duplicate dosing capsules containing a target dose of 18 mg of 5-MeO-DMT were prepared as described in steps 1-3 of Example 1A using a stock solution of 180.7 mg of 5-MeO-DMT free base in 2 ml of ethanol (90.4 mg / ml), of which 200 μl was dispensed onto the drip pad inside the capsule. The purity of the 5-MeO-DMT starting material was 99.605% as determined by HPLC, with minor percentages of three impurities (Example 1F, Table 1).

[0185] [Table 10]

[0186] 5-MeO-DMT was then aerosolized from the dosing capsules as described in steps 4 and 5 of Example 1A, except that only one Volcano Medic Vaporizer was used (i.e., the vaporizer in steps 3 and 4 was the same, and pre-heating between capsule preparation and aerosol generation was performed according to the manufacturer's instructions).

[0187] For aerosol purity analysis, each of the replicate valve balloons containing aerosol was connected to a Solid Phase Extraction (SPE) cartridge (Discovery® DSC-18). Vacuum was then applied until the balloon was completely deflated. Four aliquots of 5 ml of methanol were added to the cartridge and the extracts were analyzed directly by HPLC. Extract 1 was further diluted (1 ml to 10 ml) to achieve a linear range response.

[0188] For Replicate 1, Extract 1 (Example 1F, Table 1), it was found that the purity of the aerosol was even higher than that of the starting material (99.710% vs. 99.605%), existing impurities 2 and 3 were undetectable, while existing impurity 1 increased only minimally (0.206% vs. 0.099%), and only minimal amounts of new 5-MeO-DMT degradation products were generated (degradation product 1: 0.039%, degradation product 2: 0.044%), with the total percentage of 5-MeO-DMT degradation products in the aerosol being 0.19% (including the additional amount of impurity 1). The results of the other replicates were similar and the results of the other extracts did not change the conclusions.

[0189] [Table 11]

[0190] In conclusion, based on the methods and compositions described herein, aerosols of high purity can be produced that contain only minimal amounts of degradation products.

[0191] [Example 1G] Preparation of starting materials 5-MeO-DMT (2.0 g) was dissolved in MTBE (4 mL, 2.0 vol) at 35-40° C. and then cooled to room temperature over 30 min. After stirring at room temperature for 50 min, no crystallization was observed, so the batch temperature was lowered to 7-12° C. over 30 min. Stirring at 7-12° C. for 10 min resulted in crystallization. The batch was then filtered following stirring at 7-12° C. for 1 h. After washing with MTBE (1 mL, 0.5 vol) at 7-12° C., the batch was pulled dry under vacuum for 3.5 h to give 1.02 g of a pale orange solid (50% recovery). The isolated solid was analyzed for purity by HPLC. The purity was found to be 99.74 area %.

[0192] The table below shows the impurity profile of the isolated material.

[0193] [Table 12]

[0194] The analytical results showed that the overall purity of the material was increased and the impurities RRT1.18 and RRT1.24 were removed to less than 0.10%. The impurity RRT2.38 was also reduced to less than the target of NMT 0.10%.

[0195] Solvent analysis of the sample showed an MTBE level of 17 ppm, compared to the expected limit of NMT 5000 ppm.

[0196] [Example 2] A clinical trial of 5-MeO-DMT administered by inhalation to patients with treatment-resistant major depressive disorder Research design: A clinical trial was conducted in which patients with treatment-resistant major depressive disorder (TRD) were administered 5-MeO-DMT free base (≥99% purity). The study objectives were to determine the safety and tolerability of a daily dose of 5-MeO-DMT, the dose-related psychedelic effects, and the effects on various indicators of depression. The study was reviewed and approved by the appropriate national competent authorities and local pharmaceutical ethics committees. Patients recruited to the study had to meet the Diagnostic and Statistical Manual of Mental Disorders, 5th Edition (DSM-5) diagnostic criteria for single-episode or recurrent major depressive disorder and be treatment-resistant, both aspects of which were assessed by a psychiatrist or clinical psychologist. Patients who were using psychoactive medications or substances (such as antidepressants) were required to discontinue such medications or substances and observe a drug-free period before administration of 5-MeO-DMT. On the day of administration, a single dose of 12 mg of 5-MeO-DMT was administered to the patients by one inhalation as described in Example 1A. After administration, patients were closely monitored for 3.5 hours, with additional follow-up visits 1 and 7 days after dosing.Various safety-related indicators (e.g., reports of adverse events, safety laboratory analyses, vital signs, electrocardiogram (ECG), Clinical Diagnostic Interview Dissociative State Scale (CADSS), Psychomotor Vigilance Test (PVT), Digit Sign Substitution Test (DSST)), indicators of the intensity of the psychedelic effect (e.g., Peak Psychedelic Experiences Questionnaire (PPEQ), Altered States of Consciousness Questionnaire (ASC), Mystical Experiences Questionnaire (MEQ30), subjective description of the psychedelic experience), indicators of the severity of depression (Montgomery-Asberg Depression Rating Scale (MADRS), Patient Global Impression-Severity Scale (PGI-S), Patient Global Impression-Improvement Scale (PGI-I)) and further psychological indicators (e.g., Columbia Suicide Severity Rating Scale (C-SSRS), Brief Psychiatric Rating Scale (BPRS)) were recorded at different time points. Although psychological support from psychologists and / or psychiatrists was available to patients throughout the study, no specific psychological therapies were applied and no additional psychoactive medications were provided.

[0197] Patient characteristics: Two patients with major depressive disorder diagnosed by a psychiatrist according to DSM-5 diagnostic criteria were recruited into the study (Example 2, Table 1). The patients were considered treatment-resistant because they had not shown adequate improvement to at least two adequate courses of pharmacological treatment in the current depressive episode.

[0198] [Table 13]

[0199] result: Patients completed all scheduled visit dates. The inhalation procedure was performed appropriately by the patients and was well tolerated with no inhalation-related adverse events. The first psychedelic symptoms occurred within seconds of inhalation. The duration of the psychedelic experience, as judged by an external observer, was 16 minutes in patient 1 and 40 minutes in patient 2.

[0200] Except for a transient, clinically unrelated increase in heart rate and blood pressure immediately after administration of 5-MeO-DMT, no other notable changes occurred in vital parameters. ECG (3 hours after administration), safety laboratory analysis (3 hours and 7 days), CADSS (3 hours, 1 day and 7 days) and cognitive tests (PVT, DSST, 1 day and 7 days) were unremarkable. The few reported adverse events were mild and short-lived, and spontaneously resolved by the end of the study (Example 2, Table 2).

[0201] [Table 14]

[0202] Regarding the intensity of the psychedelic experience, patient 1 met the criteria for a peak psychedelic experience based on all three judgment scores, whereas patient 2 met the criteria for the MEQ30 and PPEQ but not the ASC (Example 2, Table 3).

[0203] [Table 15]

[0204] Surprisingly, patients reported major improvement in their depressive symptoms as assessed by MADRS, PGI-S and PGI-I already at the first assessment time point 2 hours after drug administration, and the effect deepened over time (Example 2, Table 4).Patients also met the standard criteria of MADRS response (at least 50% improvement from baseline) and MADRS remission (MADRS total score of 10 or less) at all assessment time points after drug administration, were rated as "normal, not sick at all" in PGI-S, and reported their depressive symptoms as "very much improved" or "much improved" in PGI-I, which is a very surprising result.

[0205] Patients also showed improvement in their ratings of suicidality after drug administration, as measured using the suicidal thoughts item of the MADRS and the suicidal ideation item of the C-SSRS. Other common psychiatric symptoms, such as hypochondria, anxiety, guilt, and tension, as measured by the BPRS, also improved after drug administration.

[0206] Importantly, Patient 1 and Patient 2 exhibited similar psychedelic effect intensities that correlated with similar antidepressant clinical responses. This observation supports the occurrence of peak experiences as an important mechanism for the therapeutic efficacy of 5-MeO-DMT, or at least a surrogate behavioral marker of the underlying mechanism.

[0207] [Table 16]

[0208] Summary and conclusion: A. A single dose of 12 mg of 5-MeO-DMT administered by inhalation is well tolerated and induces a surprising and highly significant clinical response in patients formally diagnosed with treatment-resistant major depressive disorder. Such a significant clinical response in treatment-resistant patients makes it likely that a clinical response will also occur in previously untreated patients. B. Clinical response occurs rapidly within 2 hours after administration of 5-MeO-DMT. Such rapid onset is rare and has not been observed with traditional classes of antidepressants, including tricyclic antidepressants, monoamine oxidase inhibitors, selective serotonin reuptake inhibitors (SSRIs), and serotonin-norepinephrine reuptake inhibitors (SNRIs), which generally take 4-6 weeks to demonstrate their effects. C. Patients experienced clinical remission within 2 hours after a single dose of 5-MeO-DMT, which is highly superior to other treatments approved for major depressive disorder, as well as all previously tested psychedelics. D. The clinical response deepened over the 7-day follow-up period, even though 5-MeO-DMT was administered only once and is no longer effectively present in the body within this time frame (see pharmacokinetic data in Example 3 below). This observation supports the excellent clinical profile of 5-MeO-DMT, allowing for convenient dosing intervals. All previous classes of antidepressants have been oral medications for daily administration over extended periods of time. E. In addition to the antidepressant effects, endpoints assessing suicidal ideation were positively affected, supporting the use of 5-MeO-DMT in patients with suicidal ideation, including those at imminent risk of suicide, such as those with active suicidal ideation with the intent to carry it out. F. In addition to the antidepressant effects, endpoints measuring other psychiatric symptoms (e.g., hypochondria, anxiety, guilt, and tension) were also positively affected, supporting the use of 5-MeO-DMT in patients with other psychiatric disorders. G. A correlation was observed between the intensity of acute psychedelic effects after 5-MeO-DMT administration and the effect of acute long-term antidepressant treatment. This demonstrates that the peak experience is achieved more rapidly in a larger proportion of patients, with the advantage of improved reproducibility in individual patients, improving the therapeutic profile. The observation that the peak psychedelic experience can occur already in some patients with low doses of 5-MeO-DMT (e.g., 6 mg, see Example 3 below), while other patients require higher doses (e.g., 18 mg, see Example 3 below), supports the therapeutic efficacy of a wide range of 5-MeO-DMT doses and supports the concept that in patients who do not achieve a peak experience after the first dose of 5-MeO-DMT, any subsequent administration should use a higher dosage than the previous administration until the patient experiences a peak psychedelic experience.

[0209] Each of the above aspects A)-G) is unexpected and highly medically relevant. Aspects A)-G) show that 5-MeO-DMT, when used according to the present invention, has a significantly improved efficacy profile compared to approved pharmacological treatments for major depressive disorder and all previously tested psychedelic agents. These data, together with the short duration of acute psychedelic effects and good safety profile, demonstrate that the present invention solves the technical problem of providing improved psychoactive therapy in patients with major depressive disorder. Based on the effects of 5-MeO-DMT observed in this study on certain psychiatric symptoms, it is likely that the technical problem will also be solved in persistent depressive disorder, anxiety disorder, post-traumatic stress disorder, body dysmorphic disorder, obsessive-compulsive disorder, eating disorders and psychoactive substance abuse.

[0210] [Example 3] Clinical trials of 5-MeO-DMT administered by inhalation to healthy volunteers Research design: A clinical trial was conducted in which different dose levels of 5-MeO-DMT free base (>99% purity) were administered by inhalation on one day to healthy volunteers with previous experience of synthetic or naturally occurring psychedelic drugs (as described in Example 1). The study was reviewed and approved by the appropriate national competent authorities and local pharmaceutical ethical committees. The study consisted of two parts: in Part A, single doses of 2 mg, 6 mg, 12 mg and 18 mg 5-MeO-DMT dosages were administered, and in Part B, an initial dose of 6 mg 5-MeO-DMT was administered, followed by further subsequent doses of 12 mg and 18 mg with approximately 3 hours between each dose, unless the participant had already experienced a peak psychedelic experience based on the PPEQ or the supervising physician determined that further dose increases were inappropriate based on observed side effects. Participants in Part A were administered only one dose, were not allowed to administer higher doses later in Part A, and were not allowed to participate in Part B. Participants were closely monitored for 3.5 hours after the last dose, with additional follow-up visits at 1 and 7 days after dosing. A variety of safety-related measures (e.g., reports of adverse events, safety laboratory analyses, vital signs, ECG, CADSS, PVT, DSST, prospective memory task (PMT)), and measures of the intensity of the psychedelic effect (MEQ30, ASC, PPEQ, subjective description of the psychedelic experience) were recorded. Pharmacokinetic analyses of 5-MeO-DMT and bufotenin plasma levels were performed 1 and 3 hours after drug administration in part A, and 3 hours after drug administration in part B.

[0211] Participant characteristics: Eighteen participants were recruited for part A of the study and four participants were recruited for part B. Nine participants were female and 13 participants were male. The median age was 29 years (range: 19-42 years). In part A, four participants received 2 mg of 5-MeO-DMT, six participants received 6 mg, four participants received 12 mg, and four participants received 18 mg. In part B, one participant received 6 mg of 5-MeO-DMT, two participants received 6 mg and then 12 mg, and one participant received 6 mg, 12 mg, and then 18 mg.

[0212] result: All participants completed all scheduled visit dates. In part A, the inhalation procedure was performed adequately by 14 of 18 participants, whereas 2 participants took 2 successive inhalations to inhale the full inhalation volume and 2 participants only inhaled approximately 3 / 4 of the full inhalation volume. In part B, the inhalation procedure was performed adequately by 3 of 4 participants, whereas 1 participant took an adequate inhalation at the first dose level but only inhaled approximately 3 / 4 of the full inhalation at the second dose level. No inhalation-related adverse events were reported.

[0213] The first psychedelic symptoms occurred in all participants within seconds of inhalation. The duration of the psychedelic experience, as judged by external observers, ranged from 7 to 30 minutes, with no dose-related trends evident.

[0214] Except for a transient, clinically irrelevant increase in heart rate and blood pressure immediately following administration of 5-MeO-DMT, no notable changes occurred in vital parameters. Evaluation of ECG, safety laboratory analyses, CADSS and cognitive tests (PVT, DSST, PMT) were unremarkable.

[0215] All adverse events reported were mild (except for one moderate event) and all resolved spontaneously by the end of the study (Example 3, Table 1 for Part A; Example 3, Table 2 for Part B). The overall tolerability profile of 5-MeO-DMT was very good, although it was observed that the 18 mg dose group in Part A had the highest number of adverse events and was the only dose group in which hallucinations and flashback experiences were reported at days 1 and 7, respectively. In Part B, only a small number of adverse events were reported despite 5-MeO-DMT being administered up to three times a day, and indeed no adverse events were reported at the 18 mg dose (following the 6 mg and 12 mg doses).

[0216] [Table 17]

[0217] [Table 18]

[0218] Regarding the intensity of psychedelic experience measured by PPEQ in part A, a dose-related trend was observed at the 2mg, 6mg and 12mg dose levels for the individual questions of PPEQ, the total score of PPEQ and the proportion of patients who achieved peak psychedelic experience. However, at the 18mg dose level, this dose-related trend continued only for the question about loss of control (Example 3, Table 3). Based on the subjective description of participants, it was found that the psychedelic experience at the 18mg dose level was associated with an altered state of consciousness that appeared very quickly in some participants, but with only a short memory of it, which may explain this observation (consistent with the so-called "white-out" phenomenon). In part B, starting with a dosage of 6mg, participants were administered further subsequent dosages of 12mg and 18mg, and it was observed that the intensity of psychedelic experience increased with increasing dosage in all participants, if participants did not achieve peak psychedelic experience at lower dosages. Furthermore, all participants were able to achieve a peak psychedelic experience at their individual maximum dose levels of 6 mg in one participant, 12 mg in two participants, and 18 mg in one participant. At this individual maximum dose level, scores for the individual questions of the PPEQ and the total PPEQ score were higher than all dose groups in Part A (Example 3, Table 3). Predictors of the individual maximum dose level required to achieve a peak psychedelic experience could not be identified.

[0219] [Table 19]

[0220] Regarding the plasma levels of 5-MeO-DMT, in Part A, it was found that the plasma levels were already very low at 1 hour for both doses, and that the plasma levels in Parts A and B reached the lower limit of quantification (LLOQ) of the 5-MeO-DMT assay (0.014 ng / ml) at 3 hours (Example 3, Table 4). Regarding the plasma levels of bufotenin, a metabolite of 5-MeO-DMT, minimal amounts below the LLOQ of the bufotenin assay (0.016 ng / ml) were observed at 1 hour in three participants, while bufotenin was undetectable in all other samples.

[0221] [Table 20]

[0222] Summary and conclusion: A. The tested 5-MeO-DMT dose levels of 2 mg, 6 mg, and 12 mg in Part A, as well as the individual dose escalation scheme in Part B with administration of 5-MeO-DMT up to three times daily, were well tolerated in all participants, with only a small number of adverse events, mostly mild and of short duration. B. In Part A, the first measurable psychedelic experience occurred at the 2 mg dose level. A more pronounced psychedelic experience and the first peak psychedelic experience occurred at the 6 mg dose level. A more potent psychedelic experience occurred at the 12 mg dose level, but still only 2 / 4 participants achieved a peak psychedelic experience. Administration of the higher 18 mg dose to randomized participants did not show any further increase in psychedelic experience scores and peak psychedelic experience rates, which may be related to a "white-out" phenomenon in some patients at this higher dose level. Additionally, adverse event rates were highest in the 18 mg group in Part A when administered to randomized participants. C. The individual dose escalation regime applied in Part B was superior to all individual dose levels in Part A, with higher mean ratings of psychedelic experience and 4 / 4 patients achieving a peak psychedelic experience at the highest individual dose. One participant dosed up to 18 mg in Part B experienced no adverse events, again supporting the individual dose escalation having a superior therapeutic profile and avoiding unnecessarily high doses. D. Plasma levels of 5-MeO-DMT were already very low 1 hour after administration and barely measurable after 3 hours. Plasma levels of bufotenine, a metabolite of 5-MeO-DMT, were barely detectable at 1 hour and undetectable after 3 hours. This pharmacokinetic data is in good agreement with the short duration of the psychedelic effects after administration of 5-MeO-DMT.

[0223] In conclusion, the studied dosages between 2 mg and 18 mg administered by inhalation were able to induce psychedelic experiences, and dosages of 6 mg, 12 mg and 18 mg of 5-MeO-DMT administered by inhalation were able to induce peak psychedelic experiences in healthy participants. From Example 2, it can be predicted that dosages between 4 mg and 20 mg, and especially between 6 mg and 18 mg, of 5-MeO-DMT administered by inhalation are therapeutically effective, since peak psychedelic experiences are likely to be associated with therapeutic benefit in patients diagnosed with major depressive disorder and other psychiatric disorders. The individualized escalation regime applied in Part B increases the chances of achieving a peak psychedelic experience with good tolerability, thus resulting in a superior therapeutic profile compared to the administration of a single fixed dose.

[0224] [Example 4] The 30-item revised Mystical Experiences Questionnaire (MEQ30) (Barrett FS, J Psychopharmacol. 2015 Nov;29(11):1182-90) The following questionnaire is applied in situations where it is necessary to quantify acute psychedelic experiences following treatment with 5-MeO-DMT. At the end of the relevant treatment session, the patient is given a form and asked to rate the extent to which they experienced any of the phenomena listed below at any time during that session, using the scale listed below. The MEQ30 is then calculated and the occurrence of peak psychedelic experiences is assessed as described in the scoring instructions.

[0225] Scale: 0 - None; None at all 1-Very slight and cannot be determined 2-Slight 3-moderate 4-Advanced (equivalent in degree to other advanced experiences) 5-Extreme (higher than any other time in life, higher than 4)

[0226] phenomenon: 1. Loss of normal time intervals. ...

Claims

1. A composition for use in treating a patient diagnosed with major depressive disorder by a qualified professional in accordance with accepted medical practice, the composition comprising 5-methoxy-N,N-dimethyltryptamine (5-MeO-DMT) or a pharma- ceutically acceptable salt thereof.

2. The method of claim 1, wherein the disorder is diagnosed according to the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5) published by the American Psychiatric Association.

3. 3. The composition of claim 1 or 2, wherein the patient suffers from moderate or severe major depressive disorder as indicated by a Montgomery-Asberg Depression Rating Scale (MADRS) score of 20 or greater, or a 17-item Hamilton Depression Rating Scale (HAM-D) score of 17 or greater.

4. 4. The method of claim 3, wherein the patient suffers from severe major depressive disorder as indicated by a MADRS score of 35 or greater, or a HAM-D score of 25 or greater.

5. The composition of any one of claims 1 to 4, wherein the patient is diagnosed with treatment-resistant major depressive disorder.

6. The composition of any one of claims 1 to 5, wherein the patient further suffers from suicidal thoughts.

7. The composition of claim 6, wherein the patient is suffering from suicidal thoughts with the intent to carry them out.

8. The composition of any one of claims 1 to 7, wherein the patient is at imminent risk of suicide.

9. 9. The composition of any one of claims 1 to 8, wherein 5-MeO-DMT or a salt thereof is administered in a dose or dosage regimen that causes the patient to experience a peak psychedelic experience.

10. The composition of claim 1, wherein a dosage of 4 mg to 20 mg of 5-MeO-DMT is administered, or an equimolar amount of a pharma- ceutically acceptable salt is administered in place of 5-MeO-DMT.

11. The composition of claim 1, wherein a dosage of 6 mg, 12 mg, or 18 mg of 5-MeO-DMT is administered, or an equimolar amount of a pharma- ceutically acceptable salt is administered in place of 5-MeO-DMT.

12. 11. The composition of any one of claims 1 to 10, wherein 5-MeO-DMT or a salt thereof is administered in a first dosage for a first administration, and 0 to 6 subsequent administrations of 5-MeO-DMT or a salt thereof, each subsequent administration using a higher dosage than the previous administration unless the patient experiences a peak psychedelic experience.

13. 13. The composition of any one of claims 1 to 12, wherein 5-MeO-DMT is administered at a dosage of 2 mg to 8 mg for a first administration, then increased to a dosage of 8 mg to 14 mg for a second administration unless the patient has already experienced a peak psychedelic experience, and then increased to a dosage of 14 mg to 20 mg for a third administration unless the patient has already experienced a peak psychedelic experience, or an equimolar amount of a pharma- ceutically acceptable salt is administered in place of 5-MeO-DMT.

14. 14. The composition of any one of claims 13, wherein the first dose of 5-MeO-DMT is 6 mg, the second dose of 5-MeO-DMT is 12 mg, and the third dose of 5-MeO-DMT is 18 mg, or an equimolar amount of a pharma- ceutically acceptable salt is administered in place of 5-MeO-DMT.

15. The composition according to any one of claims 12 to 14, wherein the interval between two administrations is at least 1 hour and at most 24 hours.

16. The composition described in claim 15, wherein the interval between two administrations is 2 to 4 hours.

17. 17. A composition according to any one of claims 9 to 16, wherein the occurrence of a peak psychedelic experience is identified by achievement of at least 60% of the highest possible score on each of the four subscales (mystical, positive mood, transcendence of time and space and indescribable) of the 30-item Revised Mystical Experiences Questionnaire (MEQ30), or by achievement of at least 60% of the highest possible score on the Oceanic Feeling (OBN) facet of the Altered States of Consciousness (ASC) Questionnaire, or by achievement of a total score on the Peak Psychedelic Experiences Questionnaire (PPEQ) of at least 75.

18. 18. The composition of claim 17, wherein the occurrence of a peak psychedelic experience is identified by achieving a Peak Psychedelic Experience Questionnaire (PPEQ) total score of at least 75.

19. The composition of any one of claims 1 to 18, wherein 5-MeO-DMT or a pharma- ceutically acceptable salt thereof is administered by inhalation.

20. 20. The composition of claim 19, wherein 5-MeO-DMT or a pharma- ceutically acceptable salt thereof is administered in the form of an aerosol comprising (a) a pharma- ceutically acceptable gas, and (b) aerosol particles of 5-methoxy-N,N-dimethyltryptamine (5-MeO-DMT) or a pharma- ceutically acceptable salt thereof, said aerosol having a mass density of aerosol particles of 0.5 mg / l to 12.5 mg / l.

21. 21. The composition of claim 20, wherein the aerosol is generated by a) exposing a thin layer of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof formed on a solid support to thermal energy, and b) passing air over the thin layer to create aerosol particles.

22. The composition according to any one of claims 19 to 21, wherein 5-MeO-DMT is used in the form of a free base.

23. 23. The composition of any one of claims 19 to 22, wherein the dosage of 5-MeO-DMT or a pharma- ceutically acceptable salt administered to the patient is inhaled in a single breath.

24. 24. The composition of any one of claims 1 to 23, wherein the clinical response, as measured by a score of at least "marked improvement" in a Clinical Global Impression-Improvement (CGI-I) score or a Patient Global Impression-Improvement (PGI-I) score, occurs within 2 hours after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof.

25. 25. The composition of any one of claims 1 to 24, wherein the clinical response, as measured by a score of at least "marked improvement" in the CGI-I score or PGI-I score, persists for at least 6 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof.

26. 26. The composition of any one of claims 1 to 25, wherein the clinical response, as measured by a score of at least "marked improvement" in the CGI-I score or PGI-I score, is sustained for at least 14 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof.

27. 27. The composition of any one of claims 1 to 26, wherein the clinical response, as measured by a score of at least "marked improvement" in the CGI-I score or PGI-I score, is sustained for at least 28 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof.

28. 28. The composition of any one of claims 1 to 27, wherein the clinical response, as determined by at least a 50% improvement in MADRS or HAM-D score compared to the respective scores before treatment, occurs within 2 hours after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof.

29. 29. The composition of any one of claims 1 to 28, wherein remission of depressive symptoms as measured by a MADRS score of 10 or less or a HAM-D score of 7 or less occurs within 2 hours after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof.

30. 30. The composition of any one of claims 1 to 29, wherein the clinical response, as determined by at least a 50% improvement in MADRS or HAM-D score compared to the respective scores before treatment, persists for at least 6 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof.

31. 31. The composition of any one of claims 1 to 30, wherein a clinical response, as determined by at least a 75% improvement in MADRS or HAM-D score compared to the respective score before treatment, is present 7 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof.

32. 32. The composition of any one of claims 1 to 31, wherein the patient is in remission of depressive symptoms as determined by a MADRS score of 10 or less or a HAM-D score of 7 or less 7 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof.

33. 33. The composition of any one of claims 1 to 32, wherein the clinical response, as determined by at least a 50% improvement in MADRS or HAM-D score compared to the respective scores before treatment, is sustained for at least 14 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof.

34. 34. The composition of any one of claims 1 to 33, wherein a clinical response, as determined by at least a 75% improvement in MADRS or HAM-D score compared to the respective score before treatment, is present 14 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof.

35. 35. The composition of any one of claims 1 to 34, wherein the patient is in remission of depressive symptoms as determined by a MADRS score of 10 or less or a HAM-D score of 7 or less 14 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof.

36. 36. The composition of any one of claims 1 to 35, wherein the clinical response, as measured by at least a 50% improvement in MADRS or HAM-D score compared to the respective scores before treatment, is sustained for at least 28 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof.

37. 37. The composition of any one of claims 1 to 36, wherein a clinical response, as determined by at least a 75% improvement in MADRS or HAM-D score compared to the respective scores before treatment, is present 28 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof.

38. 38. The composition of any one of claims 1 to 37, wherein the patient is in remission of depressive symptoms as determined by a MADRS score of 10 or less or a HAM-D score of 7 or less 28 days after the last administration of 5-MeO-DMT or a pharma- ceutically acceptable salt thereof.

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