Compositions and methods for treatment of anterior blepharitis and posterior blepharitis

Abstract

To provide methods and pharmaceutical compositions for the treatment of anterior blepharitis and posterior blepharitis.SOLUTION: Anterior blepharitis and posterior blepharitis may be of primary origin and not secondary to other factors such as infections, infestations or rosacea. The composition comprises Ivermectin in a range of about 0.001% to 20% by weight of the total composition. Topical administration of the compositions precisely to the eyelid margin provides therapeutic benefit to patients suffering from anterior blepharitis and posterior blepharitis.SELECTED DRAWING: None

Description

[Technical Field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This Patent Cooperation Treaty (PCT) international application claims priority to and benefit of a nonprovisional patent application (Application Serial No. 16 / 997,079) entitled "Compositions And Methods For The Treatment Of Anterior Blepharitis And Posterior Blepharitis," filed in the U.S. Patent and Trademark Office on August 19, 2020, which claims priority to and benefit of a provisional patent application (Application Serial No. 62 / 889,323) entitled "A Method Of Treatment For Anterior And Posterior Blepharitis," filed in the U.S. Patent and Trademark Office on August 20, 2019. The specifications of the above-referenced patent applications are incorporated herein by reference in their entireties.

[0002] The present invention relates to pharmaceutical compositions and methods for the treatment of anterior and posterior blepharitis, which may be primary in origin or may not be secondary to other factors such as infection, infestation, or rosacea. The compositions contain ivermectin in the range of 0.001% to 20% by weight of the total composition. Topical administration of the compositions precisely to the eyelid margin provides therapeutic benefit to patients suffering from anterior and posterior blepharitis. [Background technology]

[0003] FIG. 1A shows a sagittal section through the anterior portion of the eyeball and eyelid 100. Blepharitis is a term used to describe inflammatory conditions of the eyelid margin 104, extending proximally from the area around the root of the anterior-most eyelashes to distally to the edge of the eyelid margin 104 where it meets the eyeball 106. Blepharitis is a multifactorial disease that remains poorly understood to date. It is the most common form of eyelid disease and accounts for the majority of ophthalmologist consultations. In its most common forms, the cause is unknown. It is a chronic inflammatory condition that causes breakdown of the tear film covering the eyeball, resulting in multiple symptoms, including ocular discomfort, itching, redness, foreign body sensation, dry eye disease, swelling of the eyelid margin 104, and blurred vision.

[0004] Various classifications of blepharitis have been proposed, but none of these have gained widespread acceptance and they tend to be used together and interchangeably.

[0005] Clinically, classification based on anatomical grounds is as follows: Anterior blepharitis occurs at the outer anterior margin of the eyelid where the eyelashes attach, affecting the base of the eyelashes, the hair follicles, and the keratinized skin surrounding them, as shown in Figure 1B. In addition to containing the bulb of the eyelash, the base of the eyelashes also contains the sebaceous gland. Posterior blepharitis affects the inner edge of the eyelid that contacts the eyeball 106. Posterior blepharitis affects the meibomian glands 103A, located within the body of the tarsal plate 103, and their openings 104B on the eyelid margin 104, and their surrounding epithelium, as shown in FIG. 1B. It is often also referred to as meibomian gland inflammation or meibomian gland disease (MGD).

[0006] A classification based on etiology is also commonly used clinically. This classification is as follows: Primary blepharitis is a condition of uncertain etiology, and secondary blepharitis is a condition in which the pathology can be attributed to bacterial infection, lice or mite infestation, systemic conditions such as psoriasis, rosacea, atopic diseases, or medications such as isotretinoin.

[0007] The majority of clinically presenting blepharitis cases have no obvious causative factor and are therefore referred to as primary or noninfectious blepharitis. The prevalence of this condition is extremely high, with estimates ranging from 10% to over 90% in the general population. Prevalence increases with age and is more common in East Asian populations. Despite being one of the most common conditions presented to clinicians, it remains a poorly understood and undertreated clinical entity.

[0008] FIG. 1A also shows the corneal scleral junction 106c, the posterior chamber of the eye (vitreous cavity) and the neuroretinal line 110 on the inner wall of the posterior chamber, the iris 111 with the pupil as its central aperture, and the crystalline lens 112 which forms the boundary between the anterior and posterior chambers.

[0009] FIG. 1B shows an enlarged view of the eyelid margin 104 (artificially divided between the anterior lamella 102 and the posterior lamella 103). FIG. 1B shows the skin 102A, connective tissue 102B, muscle 102C, and fat 102D of the anterior lamella 102. FIG. 1C shows an enlarged view of the eyelid margin 104 showing the relevant areas and structures affected by anterior and posterior blepharitis. The relevant areas and structures affected by anterior and posterior blepharitis at the eyelid margin 104 include the meibomian gland orifices 104B, the bases of the eyelashes 104A, the skin 104C lining the anterior and posterior lamella 103 of the eyelid margin (the tarsal plate containing the meibomian glands), and the internal tissue of the anterior lamella 102 of the eyelid margin. Despite the complexity of the classification, the ultimate pathology common to all cases of primary blepharitis is inflammatory changes in the base of the eyelashes, the skin of the eyelid margin 104, and the meibomian glands 103A and their openings 104B on the eyelid margin 104, as shown in Figures 1B and 1C. It is the inflammatory process that results in the symptoms and signs that characterize the condition. Furthermore, despite the anatomical classification into anterior and posterior blepharitis, in reality, the overwhelming majority of cases have varying degrees of inflammation affecting the eyelid margin 104, both the anterior lamella 102 and the posterior lamella 103 of the eyelid. Therefore, effective therapies that treat the entire eyelid margin 104 are needed.

[0010] Figure 3 illustrates an exemplary classification of the various proposed types of meibomian gland dysfunction, all subdivided into primary and secondary forms, all of which lead to clinically evident inflammation. This classification into primary and secondary forms also applies to anterior blepharitis. The end result is inflammation, which causes most of the symptoms, signs, and consequences of blepharitis. Figure 3 is reproduced from "The International Workshop on Meibomian Gland Dysfunction: Executive Summary," written by Kelly K. Nichols et al. and published in Investigative Ophthalmology & Visual Science, Special Issue 2011, Vol. 52, No. 4, pp. 1922-1929.

[0011] Figure 4 exemplarily illustrates the drug distribution pathways through the cornea and conjunctiva / sclera after topical administration. This provides a route that topical pharmaceuticals that contact the eye can take to reach the retina and posterior neural tissues of the optic nerve. Therefore, drugs that are potentially toxic to the neural tissues of the retina and optic nerve can penetrate the eye and affect those tissues if they mix with or dissolve in the tear film. Figure 4 is reproduced from "Topical and Systemic Drug Delivery to the Posterior Segments," by Hughes et al., published in Advanced Drug Delivery Reviews, 57, (2005), 2010–2032.

[0012] The etiology of primary blepharitis remains unknown, but hypotheses for causative factors range from an overgrowth of normal commensal bacterial organisms on the eyelid, a reaction to toxins secreted by these bacteria, and an alteration in the composition of lipids secreted by the sebaceous glands of the eyelashes and the meibomian glands contained in the tarsal plate of the eyelid. 103 Blepharitis is a disease complex with a multifactorial etiology, but in the most common forms, the etiology of the inflammatory process is unknown.

[0013] Secondary blepharitis is a condition with known causative factors, such as obvious microbial infection, infestation of the eyelashes by mites such as Demodex, systemic conditions such as rosacea and psoriasis, atopic diseases, side effects of drugs such as isotretinoin used to treat acne vulgaris, chemical injury, post-radiation effects, and a variety of other conditions.

[0014] Blepharitis caused by infestation of the eyelash base with mites such as Demodex folliculorum and infestation of the meibomian glands with Demodex brevis is also considered by some to be a specific entity, but this is not widely accepted as significant evidence that Demodex infestation may be secondary to a primary inflammatory process. The normal flora of the skin, and therefore the keratinized surface of the eyelid margin, typically contains a variety of organisms, including bacteria, fungi, and mites, as symbionts necessary for optimizing the skin ecosystem. Demodex species are very common symbionts, and their identification increases with age, with some reports indicating their presence in up to 30% of eyelash specimens. The average infestation rate of eyelash specimens with Demodex folliculorum is approximately 30% in cases of inflammatory blepharitis, which is nearly identical to the infestation rate seen in eyelash specimens from subjects without blepharitis. Therefore, the role of Demodex species in the pathogenesis of even a small subset of blepharitis, particularly meibomian gland disease, remains speculative. Consequently, the majority of cases involve blepharitis resulting from inflammation of unknown etiology.

[0015] Current methods for treating this condition have met with limited success and primarily involve cleansing the eyelid margin 104 with shampoos, liquid cleansers, and various solutions such as tea tree oil, which are rubbed onto the eyelid margin 104. T-tree oil cleansers, which contain an active ingredient called "terpinol," have been described as a treatment for presumed Demodex-associated blepharitis.

[0016] Oral medications such as antibiotics, such as tetracycline, and macrolytic lactones, such as azithromycin, have been proposed, but these require daily ingestion for several months. The success of such treatments remains limited. Oral vitamin D has also been proposed, but again with limited success.

[0017] Topical therapeutic applications to the eyelid margin 104 for the treatment of inflammatory blepharitis include antibiotics such as tetracycline, azithromycin and steroid preparations.

[0018] Investigative Ophthalmology & Visual Science, Special Issue 2011, Vol. 52, No. 4, pp. 2050–2064, “The International Workshop on Meibomian Gland Dysfunction: Report of the Subcommittee on Management and Treatment of Meibomian Gland Dysfunction,” provides current practice patterns, including artificial lubricant application, topical lipid supplementation, eyelid hygiene, warm compresses, heat application, topical antibiotic application, topical steroid application, topical calcineurin inhibitors, and systemic administration of cyclosporine, tetracycline, and derivatives. It further indicates that Demodex mites have an etiologic role in some forms of anterior blepharitis, but there is no evidence of Demodex mites in the pathogenesis of posterior blepharitis.

[0019] The application of antiparasitic drugs such as ivermectin and isoxazoline has been proposed as a treatment for blepharitis due to presumed infestation with Demodex mites. However, the majority of cases of inflammatory blepharitis are not associated with mite activity.

[0020] Ivermectin is a member of the avermectin class of macrolides used as an anti-acaricide. Ivermectin is a semisynthetic compound derived from the fermentation of Streptomyces avermilitis. It is 5-O-demethyl-22,23-dihydroavermectin A 1a and 5-O-demethyl-25-de(1-methylpropyl)-25-(1-methylethyl)-22,23 dihydroavermectin A 1a It is a mixture containing

[0021] Antiparasitic drugs such as ivermectin and isoxazolines are potentially highly toxic to certain neural tissues, such as the retina, which is primarily composed of neural tissue. The retina of vertebrates, particularly humans, contains neurons, particularly amacrine cells, which contain ligand-gated ion channels on GABA (γ-aminobutyric acid) receptors present on retinal neurons. GABA is the primary inhibitory neurotransmitter in the vertebrate retina and plays a key role in processing visual information in the retina. Three families of GABA receptors exist in the retina: ionotropic GABA-A, ionotropic GABA-C, and metabotropic GABA-B receptors.

[0022] Ivermectin blocks synaptic transmission by cells containing GABA receptors by binding to the ligand-gated ion channels of these receptors. Because GABA is the primary inhibitory neurotransmitter, this blockade of synaptic transmission results in hyperpolarization of these cells.

[0023] Oral ivermectin has been shown to have a favorable safety profile, but high doses have caused paralysis, as expected due to enhanced inhibition resulting from hyperpolarization of cells containing inhibitory neurotransmitters. Because vertebrates contain GABA-mediated signaling only in selected neural tissues, such as the central nervous system and retina, the presence of the blood-brain and blood-retinal barriers in vertebrates prevents ivermectin molecules from reaching these tissues in normal vertebrates with intact barriers.

[0024] Application of topical preparations to the eyelid margin 104 takes the form of creams, ointments, and drops that are either solutions or suspensions of the active ingredient. Wax has been proposed as a vehicle for the active ingredient to be applied to the eyelid margin 104, which then acts as a reservoir for delivery onto the surface of the eyeball 106.

[0025] The eyelid margin 104 is a unique structure. It extends from the inner to outer canthus of the eyelid and has a flat shape that allows for a reasonably watertight seal when the eyelid is closed. The outer edge of the eyelid margin 104 is slightly curved and lined by keratinized epithelium, an extension of the outer eyelid skin. This keratinized epithelium extends to and includes the lining of the external orifice of the meibomian gland, a holocrine gland contained within the tarsal plate 103 of the eyelid. It also extends to the ampulla of the meibomian gland. The anterior lamella 102 of the eyelid, shown in Figure 1B, extends approximately halfway through the thickness of the eyelid margin 104 and is joined to the posterior lamella 103, which includes the tarsal plate 103 and provides rigidity to the eyelid. Just past the external orifice 104B of the meibomian gland, the keratinized epithelium transitions to the mucosal epithelium of the conjunctival lining of the inner surface of the eyelid at the mucocutaneous junction 104D. The inner surface of the eyelid is steeply shaped and flattens against the eyeball 106. Chronic inflammation of the eyelid margin results in excessive keratinization of the eyelid margin 104, causing blockage and obstruction of the orifice 104B.

[0026] Blockage of the meibomian glands results in glandular dysfunction. Secretions from the meibomian glands comprise the outer layer of the tear film, which lines the eyeball 106. Figure 2 shows a proposed model of the human tear film (not to scale). It provides a cross-section of a normal tear film, with an outer lipid layer composed of secretions from the meibomian glands, an aqueous layer of the tear film secreted by the lacrimal glands, and a mucin layer secreted by the mucous glands of the conjunctiva. This layer lines the epithelium of the cornea and sclera, extends into the conjunctival sac, and overlies the conjunctiva 103b, which lines the tarsal plate 103. It is limited anteriorly to the eyelid margin, at or near the mucocutaneous junction 104D. The mucin layer is secreted by specialized cells of the conjunctival epithelium and directly lines the corneal and conjunctival epithelium. It supports the aqueous layer of the tear film by facilitating its spreading. The lipid layer is the outer coat of the tear film, contains the aqueous layer, and acts to retard aqueous evaporation. The lipid layer is secreted by the meibomian glands. Figure 2 is reproduced from "The International Workshop on Meibomian Gland Dysfunction: Executive Summary," written by Kelly K. Nichols et al. and published in Investigative Ophthalmology & Visual Science, Special Issue 2011, Vol. 52, No. 4, pp. 1922-1929.

[0027] The tear film comprises three layers. The inner layer, closest to the eyeball 106, is composed of a mucous membrane component. The majority of the tear film is aqueous, secreted by the lacrimal glands. The outer layer of the tear film is a lipid layer containing fatty and waxy secretions from the meibomian glands. Chronic inflammation alters the composition of the lipid layer. Blockage of the meibomian gland orifices reduces the amount of lipid secreted, allowing increased drying of the aqueous component, which causes evaporative dry eye. The lipid layer acts to contain the tear film at the crescent-shaped edge of the tear film at the mucocutaneous junction 104D of the eyelid margin 104. Therefore, the tear film at the eyelid margin is located very close to the meibomian gland orifices, as shown in Figure 1D.

[0028] Figure 1D shows a schematic diagram of the eyelid margin in relation to the cornea 106A and sclera 106B of the eye. In particular, the relationship of the tear film meniscus 111A and the orifices of the meibomian glands to the mucocutaneous junction 104D is shown. This provides a close-up view of the eyelid margin structure in relation to the eyeball, which consists of a central transparent cornea 106A and a surrounding opaque sclera 106B. The cornea is lined by specialized epithelium (not shown), and the sclera 106B is lined by conjunctival epithelium, which is continuous with the conjunctival epithelium lining the tarsal plate at the posterior lamella 103. The tear film lining the anterior portion of the eyeball covers the entire anterior portion of the eyeball, including the cornea 106A and sclera 106B. It forms a conglomerate at the junction where the posterior eyelid margin meets the eyeball. This conglomerate has a crescentic shape. Generally, the leading edge of the meniscus is on or within the mucoid side of the mucocutaneous junction, and the lipid layer of the tear film is supplied to the tear film from meibomian gland orifices 104B, which are located anterior to the crescentic edge.

[0029] Existing delivery formulations such as creams, ointments, drops, suspensions, and lotions have limited retention and adhesion to the eyelid margin 104 and tend to dissolve and spread in the tear film. Droplet lotions and solutions are easily diluted and washed away by the tear film, failing to maintain effective concentrations at the desired site of action.

[0030] Emulsions such as creams and ointments also tend to become diluted, washed off, accidentally wiped off, smeared onto the eyeball 106, and collect in the conjunctival sac 108 of the eyelid.

[0031] In addition to the inability of these formulations to maintain effective concentrations at the required site of action, the concentration of the active ingredient in the conjunctival sac and application to the eye 106 allows the active ingredient to penetrate the cornea 106A and sclera 106B of the eye 106 and enter the interior of the eye 106 and internal nervous tissue.

[0032] Lipophilic molecules can penetrate the cornea 106 to reach the anterior chamber 109 of the eye and then diffuse into the vitreous cavity where they can come into contact with the neural tissue of the retina lining the vitreous cavity.

[0033] Hydrophilic and lipophilic molecules, especially small molecules less than 150 kDa, can also diffuse through the conjunctiva and sclera. Because ivermectin is classified as a small molecule, its potential to penetrate the conjunctiva and sclera and reach the neural retina is a real possibility. Neurotoxic drugs that dissolve in the tear film and collect in the conjunctival sac108 demonstrate a real possibility of penetrating the conjunctiva and sclera.

[0034] Therefore, there is a need for a formulation containing an active ingredient that can limit delivery to the immediate area of application. Due to the unique environment of the eyelid margin 104, the formulation should have a high degree of retention to both allow precise application, maximize bioavailability, and minimize spread to other areas.

[0035] Because the eyelid margin, shown in Figure ID, is a unique environment containing hair-bearing skin and skin bounded by the aqueous environment of the tear film, existing formulations for topical application on bare or hair-bearing skin are not suitable. Formulations are also subject to the stress and spreading effect of the eyelids imposed by closing the eyelids during the normal course of a blink.

[0036] U.S. Patent Application Publication No. 2017 / 0232024 discloses a method for treating Demodex-associated blepharitis, in which the active ingredients ivermectin and antibiotics are formulated into a cream or ointment that is applied using a finger or a cotton swab to the base of the eyelashes, located only in the anterior portion of the eyelid margin 104. These application methods are uncertain and imprecise. There is no mention of application onto the orifices 104B of the meibomian glands 103A. There is no mention of treating primary blepharitis or meibomian gland inflammation or meibomian gland disease. Furthermore, formulation into a pure emulsion, such as a cream or ointment, significantly limits adhesion and retention on the eyelid margin 104. For example, steroid-containing creams or ointments are known to spread across the eyeball 106, penetrate the ocular membrane, and enter the interior of the eyeball. This has been shown to lead to adverse effects, such as glaucoma and cataracts.

[0037] U.S. Patent Application Publication No. 2018 / 0369184 discloses a method of applying a lipid formulation to the eyelid margin 104 to deliver a benefit agent to the ocular surface. The formulation is specifically designed to soften or melt at typical eyelid temperatures so that the active ingredient can be spread over the ocular surface via the tear film and assisted by the natural spreading effect of blinking.

[0038] International Publication No. WO2007 / 054822 discloses a method for treating ocular rosacea and ocular rosacea-associated blepharitis using a topical form of ivermectin. However, blepharitis caused by rosacea is a very limited subset of symptoms, and preferred formulations are in the form of eyewash or eye drops applied to the conjunctival sac 108 and cornea 106 of the eye. These formulations do not specifically target the eyelid margin 104, and in addition to having limited bioavailability due to the dilution effect of the tear film, there is a clear risk that ivermectin will diffuse into the eyeball 106 and cause toxic effects on GABA-mediated neurons in the retina.

[0039] Therefore, there is a need for an effective and safe method of treating anterior and posterior blepharitis that is primary in origin and not necessarily related to bacterial infection, presumed mite infestation, or other factors that lead to blepharitis, such as rosacea, psoriasis, or medications such as isotretinoin. Currently available treatment methods have limited efficacy. Currently available formulations for topical application to the hair and skin surface are not well suited to application to the eyelid margin 104, a unique environment that is highly compact and includes hair, skin, and glandular orifices, closely bounded by the aqueous layer of the tear film (FIG. 1D), and where tissues are in constant movement, such as occurs during blinking. There is also a long-felt need for a composition that can be applied to the affected area of the eyelid margin 104 around the eyelashes and adjacent skin, including the keratinized skin 104C between the eyelashes 104A and the mucocutaneous junction 104D of the eyelid margin, and that has some ability to penetrate the orifices of the meibomian glands. Summary of the Invention

[0040] This Summary is provided to introduce a selection of concepts in a simplified form that are further disclosed in the Detailed Description of the Invention. This Summary is not intended to determine the scope of the claimed subject matter.

[0041] The present invention relates to pharmaceutical compositions and methods for the treatment of the most common forms of anterior and posterior blepharitis, whether primary in origin or secondary to infection, infestation or other factors such as rosacea using such pharmaceutical compositions.

[0042] In one aspect, the present invention provides a method for treating anterior and posterior blepharitis in a subject in need thereof, comprising topically administering to the subject a pharmaceutical composition comprising ivermectin and an ophthalmically acceptable carrier, without co-administration with another active pharmaceutical ingredient, precisely to the eyelid margin of the subject, wherein the pharmaceutical composition comprises 0.001% to 20% by weight of ivermectin, and wherein the pharmaceutical composition adheres to the eyelid margin.

[0043] In another aspect, the present invention provides a method for treating primary blepharitis in a subject in need thereof, comprising topically administering a pharmaceutical composition comprising ivermectin and an ophthalmically acceptable carrier, without co-administration with another active pharmaceutical ingredient, to the subject's eyelid margin exactly once daily for three days, and repeating two weeks later once daily for three days, wherein the pharmaceutical composition comprises 0.001% to 20% ivermectin by weight, and wherein the pharmaceutical composition is adhered to the eyelid margin.

[0044] In yet another aspect, the present invention provides a pharmaceutical composition comprising: (a) an ophthalmically acceptable carrier; and (b) a therapeutically effective amount of a biologically active substance, suitable for precise application to the eyelid margin of a subject, wherein the pharmaceutical composition adheres to the eyelid margin.

[0045] In yet another aspect, the present invention provides a topical pharmaceutical composition comprising 0.001% to 20% by weight of ivermectin, and a method for preparing the topical pharmaceutical composition.

[0046] In yet another aspect, the present invention relates to an article of manufacture comprising a topical pharmaceutical composition; and a container containing the topical pharmaceutical composition contained therein.

[0047] In yet another aspect, the present invention relates to a kit useful for treating anterior and posterior blepharitis in a subject in need thereof, or primary blepharitis in a subject in need thereof, or both, The kit comprises a topical pharmaceutical composition; and an ocular applicator. BRIEF DESCRIPTION OF THE DRAWINGS The foregoing summary, as well as the following detailed description of the invention, will be better understood when read in conjunction with the appended drawings, in which: For the purpose of illustrating the invention, there are shown in the drawings exemplary configurations of the invention. However, the invention is not limited to the particular methods and compositions disclosed herein. Any description of a method step or composition referenced by a number in a drawing is applicable to the description of that method step or composition indicated by the same number in any subsequent drawing herein. [Brief explanation of the drawings]

[0048] [Figure 1A] A cross section of the anterior part of the eye (sagittal section through the anterior part of the eyeball and eyelid) is shown.

[0049] [Figure 1B] A close-up of the eyelid margin is shown (artificially divided between the anterior and posterior lamellae).

[0050] [Figure 1C] A close-up of the eyelid margin showing the relevant areas and structures affected by anterior and posterior blepharitis (without artificially dividing the anterior and posterior lamellae) is shown.

[0051] [Figure 1D] 1 shows a schematic diagram of the eyelid margin in relation to the cornea and sclera of the eye.

[0052] [Figure 2] A proposed model of the human tear film is shown (not to scale).

[0053] [Figure 3] 1 illustrates exemplary classifications of various proposed types of meibomian gland dysfunction.

[0054] [Figure 4] Illustratively, the drug distribution route is via the corneal and conjunctival / scleral routes after topical administration. DETAILED DESCRIPTION OF THE INVENTION

[0055] It is to be understood that the invention is not necessarily limited in its application to the details set forth in the following description or illustrated by way of example. The invention is capable of other embodiments or of being practiced or carried out in various ways. Also, it is to be understood that the phraseology and terminology employed herein is for the purpose of description and should not be regarded as limiting.

[0056] The term "pharmaceutical composition" is used herein to refer to a composition used to prevent, reduce the intensity of, cure, or treat a targeted symptom or disease.

[0057] The terms "subject" or "patient" are used interchangeably to refer to members of animal species of mammalian origin, including, but not limited to, mice, rats, cats, goats, cows, sheep, horses, hamsters, ferrets, pigs, dogs, platypus, guinea pigs, rabbits, and primates, such as monkeys, apes, or humans.

[0058] The phrase "subject in need thereof," as used herein, unless the context and use of the phrase indicate otherwise, refers to: (i) a subject to whom the described topical pharmaceutical composition of the present invention is to be administered; (ii) a subject to whom the described topical pharmaceutical composition of the present invention is being applied; or (iii) a subject to whom the described topical pharmaceutical composition of the present invention has been applied.

[0059] The term "topical" refers to the direct administration of a pharmaceutical composition to a target tissue. The terms "topical administration" and "topically applying" are used interchangeably to refer to the delivery of the pharmaceutical composition of the present invention to one or more eyelid margins. The pharmaceutical composition can be applied by injection, dripping, or spraying in the case of a liquid; by rubbing in the case of an ointment, lotion, cream, gel, etc.; by sprinkling in the case of a powder; by spraying in the case of a liquid or aerosol composition; or by any other suitable means. Topical administration generally provides a local effect rather than a systemic effect.

[0060] The term "treatment" or "treating" includes arresting, substantially inhibiting, slowing, or reversing the progression of a disease, condition, or disorder, and substantially ameliorating the symptoms of the condition. The term "treatment" or "treating," as used herein, further refers to achieving one or more of the following: (a) reducing the severity of the disorder; (b) limiting the occurrence of symptoms characteristic of the disorder(s) being treated; (c) limiting the worsening of symptoms characteristic of the disorder(s) being treated; (d) limiting the recurrence of the disorder(s) in patients who have previously had the disorder(s); and (e) limiting the recurrence of symptoms in patients who were previously symptomatic for the disorder(s) or curing the disease.

[0061] The term "excipient" as used herein refers to any inactive ingredient added to the pharmaceutical composition of the present invention described, which is not intended to exert a therapeutic effect at the intended dosage, but may act to improve the delivery of the product. Further characteristics of excipients can be found in the Guidance for Industry Nonclinical Studies for the Safety Evaluation of Pharmaceutical Excipients published by the US Food and Drug Administration Center for Drug Evaluation and Research, which is incorporated herein by reference.

[0062] The term "adheres" or "adhere," as used herein, refers to the same property as "sticking" or "adhering." The term "adheres" or "adhered," as used herein, further refers to binding or enclosing or containing or restrictively retaining or substantially adhering a pharmaceutical composition to the eyelid margin(s), or a drug dosage form or pharmaceutical composition that is in contact with and retained on the surface of the eyelid margin(s). The term "adhere" does not imply any particular degree of adhesion or bonding, nor does it imply a degree of durability.

[0063] Inflammation of unknown origin accounts for the majority of cases of both anterior and posterior blepharitis. Blepharitis resulting from identifiable causes, such as bacterial infection, mite infestation, rosacea, or other causes, constitutes a minority of the cases of blepharitis commonly seen in clinical practice. Therapeutically effective treatments for this condition have very limited efficacy, and the condition is most often chronic, requiring long-term treatment.

[0064] The present invention provides methods for the treatment of anterior and posterior blepharitis, which may be of primary origin or secondary to other factors such as infection, infestation, or rosacea. The present invention provides methods for treating blepharitis that may be classified as primary blepharitis, which affects the anterior and posterior eyelid margin.

[0065] In one aspect, the present invention provides a method for treating anterior and posterior blepharitis in a subject in need thereof, comprising topically administering to the subject a pharmaceutical composition comprising ivermectin and an ophthalmically acceptable carrier, without co-administration with another active pharmaceutical ingredient, precisely to the eyelid margin of the subject, wherein the pharmaceutical composition comprises 0.001% to 20% by weight of ivermectin, and wherein the pharmaceutical composition adheres to the eyelid margin.

[0066] In one embodiment, the method includes identifying a subject with primary inflammatory blepharitis and precisely topically applying to the eyelid margin a pharmaceutical composition containing a therapeutically effective amount of ivermectin. The pharmaceutical composition is such that precise application to the eyelid margin is possible. The pharmaceutical composition is placed on the eyelid margin, adheres to the eyelid margin, and is held in place for a period of time sufficient to ensure sufficient therapeutic bioavailability of the ivermectin.

[0067] In certain embodiments, the pharmaceutical composition has properties of adhesion to underlying tissue, water and waterproofing, and durability when the eyelids are regularly brought together by the natural act of blinking.

[0068] In some embodiments, the pharmaceutical composition retains the active ingredient within the application so that it minimizes dispersion or dissolution in the tear film. In some embodiments, the pharmaceutical composition is resistant to dispersion, thereby retaining it at the eyelid margin. In other embodiments, the pharmaceutical composition is durable across the surface to which it is applied, and the pharmaceutical composition is insoluble in the tear film. The method is effective in reducing the symptoms and signs of primary inflammatory blepharitis and treating evaporative dry eye secondary to inflammatory blepharitis.

[0069] The present inventors have discovered that therapeutically effective concentrations of ivermectin contained in pharmaceutical compositions specifically designed for application to the eyelid margin, extending proximally from the base of the eyelashes to and including the orifices of the meibomian glands, are unexpectedly effective in treating anterior and posterior blepharitis, particularly primary anterior and posterior blepharitis. This is an unexpected result, as ivermectin is primarily considered an endectocide.

[0070] Therapeutically effective concentration is defined in the medical field as the concentration of an active ingredient that alleviates the symptoms and signs associated with the condition, and such improvement is maintained for the longest period of time without causing toxic effects. Typically, 1% by weight of ivermectin of the total composition has been found to be appropriate in clinical practice, but this concentration is provided as an example and is in no way intended to limit the present invention.

[0071] The pharmaceutical composition is also unexpectedly effective in treating evaporative dry eye, which is the result of a lack of lipids secreted by the meibomian glands causing a deficiency in the lipid layer of the tear film, resulting in more rapid evaporation of the aqueous layer of the tear film due to an insufficient evaporation retarding effect of the lipid layer of the tear film.

[0072] Chronic inflammation leads to blockage of the meibomian gland orifices, resulting in the prolapse and death of the meibomian glands. Blockage of the meibomian glands leads to a decrease in lipids secreted into the tear film. The present invention is effective in treating chronic non-infectious or non-parasitic processes that cause blockage of the meibomian glands, thereby resulting in a healthy tear film.

[0073] In certain embodiments, the pharmaceutical composition has properties that prevent or minimize spreading of the pharmaceutical composition to the surface of the eyeball and adjacent tissues, such as the conjunctival sac, including application to the eyelid margin.

[0074] In certain embodiments, the pharmaceutical composition quickly settles after application and provides waterproofing and water resistance.

[0075] In another embodiment, the pharmaceutical composition has retention properties after application, such that it is resistant to cracking or displacement upon eyelid movement or contact with external surfaces such as hands, pillows, etc., and to being washed away and diluted by the tear film.

[0076] Primary anterior and posterior blepharitis refer to conditions in which there is inflammation of the eyelid margin, including the base of the eyelashes and the meibomian glands, that is not directly attributable to an identifiable cause such as infection, infestation, rosacea, or other systemic conditions. Differentiation between primary and secondary blepharitis is well known in the art and may include examination with a slit-lamp biomicroscope, swabbing of the eyelid margin for microscopy and culture, and microscopic examination of bald eyelashes for the presence of mites, which are not present in primary blepharitis of primarily inflammatory origin.

[0077] In some embodiments, the effective concentration of ivermectin in the pharmaceutical composition is a concentration that significantly reduces or completely eliminates the symptoms and signs associated with the condition. This also includes reducing or completely eliminating excessive keratinization of the eyelid margin skin, thereby promoting the recanalization of blocked meibomian glands. This also includes restoring meibomian gland secretions to their normal consistency, viscosity, and transparency, and also results in the improvement of dry eye symptoms.

[0078] In one embodiment, the pharmaceutical composition comprises about 0.001% to 20% ivermectin by weight. In one embodiment, the pharmaceutical composition comprises about 0.5% to 5% ivermectin by weight. In another embodiment, the pharmaceutical composition comprises about 1% ivermectin by weight.

[0079] In another embodiment, the method provides rapid and sustained symptomatic relief without the addition or simultaneous administration of other active pharmaceutical ingredients, such as antibiotics or steroids. This effect is independent of any known antibacterial effects and is attributed to the unexpectedly effective anti-inflammatory effect of ivermectin. The inventors have found that this anti-inflammatory effect significantly exceeds the effectiveness of currently used treatments, such as eyelid scrubs, topical antibiotics, and steroids.

[0080] In another embodiment, the pharmaceutical composition is administered periodically. In one embodiment, the pharmaceutical composition is applied daily for three days, and then the treatment is repeated two weeks later for three days. In most cases, this is sufficient to achieve a significant therapeutic effect. Treatment using this frequency can be repeated if symptoms recur, but this is only necessary in a relatively small number of cases. Intermittent administration of ivermectin provides the benefit of using a smaller amount of ivermectin, thereby reducing the possibility of adverse effects.

[0081] In another embodiment, topical application allows ivermectin to be applied directly and precisely to the subject's eyelid margin, thereby overcoming the problem associated with oral application of ivermectin, in which ivermectin is distributed to various body compartments, resulting in low concentrations at specific target sites. Direct topical application of the pharmaceutical composition to the affected area also minimizes the risk of medication-related side effects in other parts of the body.

[0082] In another embodiment, subjects with anterior and posterior blepharitis are identified and their existing symptoms and signs are noted. The pharmaceutical composition is applied by a physician using magnification, e.g., with a slit lamp, to precisely identify the area of the eyelid margin to which the pharmaceutical composition should be applied. Topical anesthetic drops are applied to the inferior conjunctival sac of the eye 5 to 10 minutes prior to application. The temporary anesthesia reduces the tear reflex, thereby minimizing tear production during application.

[0083] In another embodiment, the pharmaceutical composition is precisely applied to the eyelid margin using an ocular applicator, e.g., pretreated with or containing a topical composition. In some embodiments, the applicator is a swab, cosmetic pad, wipe, wipe stick, towel, sponge, gauze, puff, wand, brush, or comb. In some embodiments, a sponge-tipped applicator or brush is used to precisely apply the pharmaceutical composition as an adherent film or coating extending distally from and including the orifices of the meibomian glands and proximally to the base of the eyelashes and the skin. The eyelid is manually removed from contact with the eyeball during application. Care is taken to prevent spillage of the formulation into the conjunctival sac and to prevent contact with the eyeball.

[0084] In another embodiment, the pharmaceutical composition is applied to the entire length of the eyelid margin, from the lateral canthus to, but not including, the punctum. The pharmaceutical composition is applied to both the upper eyelid 101 and the lower eyelid 105 margins. The eyelid margin may be further dried with a dry sponge or swab prior to application. Drying the eyelid margin surface facilitates adhesion of the formulation.

[0085] In certain embodiments, under a slit lamp or other suitable magnification, the eyelid is manually separated from the globe by the physician, and the pharmaceutical composition is applied to the eyelid margin using a suitable sponge-tipped applicator or brush, with excess composition being wiped away.

[0086] The pharmaceutical composition is applied as a film precisely along the length of the eyelid margin, taking care that the applicator just covers the openings of the meibomian glands but does not spread the composition further onto the mucosal surface. The pharmaceutical composition is spread proximally to cover the base of the eyelashes and the skin area between them. The eyelid is held away from the eyeball until the pharmaceutical composition is in place and dry. The pharmaceutical composition takes the form of an adherent film or coating on the eyelid margin. This procedure is repeated for all four eyelid margins. Administration of the pharmaceutical composition results in enhanced meibum production.

[0087] In one embodiment, the application is left in place for about 6 to 12 hours and then removed, for example, with a sponge-tipped swab stick or similar device soaked in a solution for specific use on the eyelid margin, such as Blephagel or Blephacare. Care should be taken during removal to wipe away from the eyeball to prevent inadvertent spillage of the formulation into the conjunctival sac.

[0088] In another embodiment, the pharmaceutical composition is applied by the patient himself, for example, by using a concave magnifying mirror.The pharmaceutical composition according to the present invention is formulated so as not to cause eye irritation.Therefore, the present invention allows patients to apply such medicines themselves without having to go to a clinic.Patients may be able to continuously repeat the administration over a period of time to ensure a lower risk of blepharitis recurrence.

[0089] Various embodiments of pharmaceutical compositions having requirements for settling and drying upon application, waterproofing or water resistance, ability to be applied precisely over small spaces, durability and hold-up are known to those skilled in the art.

[0090] In another embodiment, the ophthalmically acceptable carrier comprises at least one ophthalmically acceptable excipient.

[0091] In another embodiment, the pharmaceutical composition comprises one or more of the following ingredients: sterile distilled water, ivermectin, a chelating agent, a humectant, a gum / thickener, an anionic emulsifier, a non-ionic emulsifier, a waterproofing agent, a base, a preservative, an antioxidant, and a pH adjuster.

[0092] In another embodiment, the pharmaceutical composition comprises ivermectin in the range of about 0.5% to 5% by weight, hi one embodiment, the pharmaceutical composition comprises about 1% by weight of ivermectin.

[0093] In another embodiment, the pharmaceutical composition comprises water in the range of about 0.1% to 99.0% by weight, hi one embodiment, the pharmaceutical composition comprises water in the range of about 50% to 75% by weight.

[0094] In another embodiment, the pharmaceutical composition further comprises a chelating agent in the range of about 0.1% to 5.0% by weight. In one embodiment, the pharmaceutical composition comprises a chelating agent in the range of about 0.08% to 0.2% by weight. The chelating agent may be selected from, but not limited to, disodium EDTA, sodium phytate, and tetrasodium EDTA.

[0095] In another embodiment, the pharmaceutical composition further comprises a humectant in the range of about 0.5% to 5.0% by weight. In one embodiment, the pharmaceutical composition comprises a humectant in the range of about 1.5% to 3% by weight. The humectant may be selected from, but is not limited to, glycerin, propanediol, and propylene glycol.

[0096] In another embodiment, the pharmaceutical composition comprises a gum or thickener in the range of about 0.2% to 2.0% by weight. In one embodiment, the pharmaceutical composition comprises a gum or thickener in the range of about 0.1% to 1% by weight. The gum or thickener may be selected from, but is not limited to, guar gum, hydroxyethylcellulose, xanthan gum, and veegum gel.

[0097] In another embodiment, the pharmaceutical composition comprises an anionic emulsifier in the range of about 0.3% to 3.0% by weight. In one embodiment, the pharmaceutical composition comprises an anionic emulsifier in the range of about 0.35% to 0.75% by weight. The anionic emulsifier may be selected from, but not limited to, glyceryl stearate citrate, sodium stearoyl glutamate, and glyceryl stearate SE.

[0098] In another embodiment, the pharmaceutical composition comprises a non-ionic emulsifier in the range of about 3% to 10% by weight. In one embodiment, the pharmaceutical composition comprises a non-ionic emulsifier in the range of about 4% to 8% by weight. The non-ionic emulsifier may be selected from, but is not limited to, cetearyl alcohol, cetearyl alcohol / polysorbate 60, and glyceryl stearate / PEG-100 stearate.

[0099] In another embodiment, the pharmaceutical composition comprises a waterproofing agent in the range of about 5% to about 12% by weight. In one embodiment, the pharmaceutical composition comprises a waterproofing agent in the range of about 6% to 10% by weight. The waterproofing agents include bis-stearyl ethylenediamine, neopentyl glycol, stearyl hydrogenated dimer dilinoleate copolymer (Sylvaclear C75V), and ethylenediamine / hydrogenated dimer dilinoleate copolymer bis-di-C 14~18 The addition of a waterproofing agent provides water resistance and waterproofing to the pharmaceutical composition, and is selected from, but not limited to, alkylamides (Sylvaclear A200V).

[0100] In another embodiment, the pharmaceutical composition comprises a carrier in the range of about 10% to 45% by weight. In one embodiment, the pharmaceutical composition comprises a carrier in the range of about 6% to 10% by weight. The carrier is selected from silicone oils such as, but not limited to, dimethicone 350 cps, dimethicone 500 cps, and dimethicone 1000 cps. Dimethicone has pore permeability, thereby allowing sufficient penetration of the pharmaceutical composition through the orifices of the meibomian glands to deliver the active ingredient to the glands. The carrier may also contain other compounds, such as ammonium acrylate copolymers and sodium acrylate copolymers, that provide additional waterproofing to the pharmaceutical composition.

[0101] In another embodiment, the pharmaceutical composition further comprises a preservative in the range of about 0.5% to 3% by weight. In one embodiment, the pharmaceutical composition comprises a preservative in the range of about 1% to 1.75% by weight. The preservative may be selected from, but is not limited to, phenoxyethanol and caprylyl glycol.

[0102] In another embodiment, the pharmaceutical composition comprises an antioxidant in the range of about 0.01% to 0.5% by weight. In one embodiment, the pharmaceutical composition comprises an antioxidant in the range of about 0.025% to 0.3% by weight. The antioxidant may be, but is not limited to, tocopherol D-alpha 50%.

[0103] In another aspect, the present invention provides a method for treating primary blepharitis in a subject in need thereof, comprising topically administering a pharmaceutical composition comprising ivermectin and an ophthalmically acceptable carrier, without co-administration with another active pharmaceutical ingredient, to the subject's eyelid margin exactly once daily for three days, and repeating two weeks later once daily for three days, wherein the pharmaceutical composition comprises about 0.001% to 20% ivermectin by weight, and wherein the pharmaceutical composition is adhered to the eyelid margin.

[0104] In another aspect, the present invention provides a pharmaceutical composition comprising: (a) an ophthalmically acceptable carrier; and (b) a therapeutically effective amount of a biologically active substance suitable for precise application to the eyelid margin of a subject, wherein the pharmaceutical composition adheres to the eyelid margin.

[0105] In certain embodiments, the ophthalmically acceptable carrier comprises at least one ophthalmically acceptable excipient.

[0106] In some embodiments, the biologically active substance can be any beneficial agent that can be delivered to the eyelid margin, hi some embodiments, the biologically active substance is selected from the group consisting of antiparasitic agents, steroids, antibiotics, anti-inflammatory agents, anti-neoplastic agents, antivirals, growth factors, and serum.

[0107] In certain embodiments, the pharmaceutical composition has adhesive properties and resistance to dispersion, which allows the pharmaceutical composition to remain in place for a period of time sufficient to ensure sufficient bioavailability of the biologically active substance.

[0108] In another embodiment, a pharmaceutical composition containing a therapeutically effective amount of a biologically active substance is applied precisely to the eyelid margin of a subject identified with primary inflammatory blepharitis.

[0109] In another embodiment, the ophthalmically acceptable excipient is one or more of sterile distilled water, a chelating agent, a humectant, a gum / thickener, an anionic emulsifier, a non-ionic emulsifier, a waterproofing agent, a base, a preservative, an antioxidant, and a pH adjusting agent.

[0110] In another embodiment, the pharmaceutical composition comprises water in the range of about 0.1% to 99.0% by weight, hi one embodiment, the pharmaceutical composition comprises water in the range of about 50% to 75% by weight.

[0111] In another embodiment, the pharmaceutical composition comprises a chelating agent in the range of about 0.1% to 5.0% by weight. In one embodiment, the pharmaceutical composition comprises a chelating agent in the range of about 0.08% to 0.2% by weight. The chelating agent may be selected from, but not limited to, disodium EDTA, sodium phytate, and tetrasodium EDTA.

[0112] In another embodiment, the pharmaceutical composition comprises a humectant in the range of 0.5% to 5.0% by weight. In one embodiment, the pharmaceutical composition comprises a humectant in the range of about 1.5% to 3% by weight. The chelating agent is selected from, but not limited to, glycerin, propanediol, and propylene glycol.

[0113] In another embodiment, the pharmaceutical composition comprises a gum or thickener in the range of about 0.2% to 2.0% by weight. In one embodiment, the pharmaceutical composition comprises a gum or thickener in the range of about 0.1% to 1% by weight. The gum or thickener may be selected from, but not limited to, guar gum, hydroxyethylcellulose, xanthan gum, and veegum gel.

[0114] In another embodiment, the pharmaceutical composition comprises an anionic emulsifier in the range of about 0.3% to 3.0% by weight. In one embodiment, the pharmaceutical composition comprises an anionic emulsifier in the range of about 0.35% to 0.75% by weight. The anionic emulsifier may be selected from, but not limited to, glyceryl stearate citrate, sodium stearoyl glutamate, and glyceryl stearate SE.

[0115] In another embodiment, the pharmaceutical composition comprises a non-ionic emulsifier in the range of about 3% to 10% by weight. In one embodiment, the pharmaceutical composition comprises a non-ionic emulsifier in the range of 4% to 8% by weight. The non-ionic emulsifier may be selected from, but is not limited to, cetearyl alcohol, cetearyl alcohol / polysorbate 60, and glyceryl stearate / PEG-100 stearate.

[0116] In another embodiment, the pharmaceutical composition further comprises a waterproofing agent in the range of about 5% to about 12% by weight. In one embodiment, the pharmaceutical composition comprises a waterproofing agent in the range of about 6% to 10% by weight. The waterproofing agent may be bis-stearyl ethylenediamine, neopentyl glycol, stearyl hydrogenated dimer dilinoleate copolymer (Sylvaclear C75V), or ethylenediamine / hydrogenated dimer dilinoleate copolymer bis-di-C 14~18 The addition of a waterproofing agent provides additional water resistance and waterproofing to the pharmaceutical composition, including but not limited to alkylamides (Sylvaclear A200V).

[0117] In another embodiment, the pharmaceutical composition comprises a base in the range of about 10% to 45% by weight. In one embodiment, the pharmaceutical composition comprises a base in the range of about 6% to 10% by weight. The base is selected from silicone oils such as, but not limited to, dimethicone 350 cps, dimethicone 500 cps, and dimethicone 1000 cps. Dimethicone has pore permeability, thereby allowing sufficient penetration of the pharmaceutical composition through the orifices of the meibomian glands to deliver the active ingredient to the glands. The base may also contain other compounds, such as ammonium acrylate copolymers and sodium acrylate copolymers, that provide additional waterproofing to the pharmaceutical composition.

[0118] In another embodiment, the pharmaceutical composition further comprises a preservative in the range of about 0.5% to about 3% by weight. In one embodiment, the pharmaceutical composition comprises a preservative in the range of about 1% to about 1.75% by weight. The preservative may be selected from, but is not limited to, phenoxyethanol and caprylyl glycol.

[0119] In another embodiment, the pharmaceutical composition comprises an antioxidant in the range of about 0.01% to 0.5% by weight. In one embodiment, the pharmaceutical composition comprises an antioxidant in the range of about 0.025% to 0.3% by weight. The antioxidant may be, but is not limited to, tocopherol D-alpha 50%.

[0120] In another embodiment, the pharmaceutical composition has a pH between 5 and 8. In certain embodiments, the pharmaceutical composition has a pH between 6 and 7.

[0121] In another aspect, the present invention provides topical pharmaceutical compositions comprising about 0.001% to 20% by weight of ivermectin, and methods for preparing topical pharmaceutical compositions. In embodiments, the pharmaceutical composition is a solution, suspension, salve, spray, stick, lotion, gel, paste, balm, foam, mousse, scrub or cleanser (e.g., shampoo or soap), cream, or ointment. Soaps may be in a bar, liquid, or solid form, such as a semi-solid.

[0122] In another aspect, the present invention relates to an article of manufacture comprising a topical pharmaceutical composition and a container containing the topical pharmaceutical composition, hi embodiments, the container is a collapsible or non-collapsible tube, bag, packet, blister, strip, ampoule, vial, bottle, can, or jar.

[0123] In another aspect, the present invention relates to a kit useful for treating anterior and posterior blepharitis in a subject in need of such treatment, or primary blepharitis in a subject in need of such treatment, or both. The kit includes a topical pharmaceutical composition and an ocular applicator. Optionally, the applicator may be pre-treated with or contain the topical pharmaceutical composition. The kit may further include a container containing the composition. The kit may further include instructions (e.g., printed or digital instructions) for treating anterior and posterior blepharitis in a subject in need of such treatment, or primary blepharitis in a subject in need of such treatment, by topically administering the composition precisely to the subject's eyelid margin.

[0124] Ophthalmic preparations should be prepared so that they are tolerated by ocular tissues and made according to sterile compounding methods detailed in the 2019 US Pharmacopeia National Formulary, UPS42-NF37, by the United States Pharmacopeial Convention.

[0125] Clinically based topical application of ivermectin for the treatment of inflammatory blepharitis has been successful both in cases in which Demodex species were not isolated (which constituted the majority of treated cases of blepharitis) and in the smaller number of cases in which Demodex species were isolated. Most of these were cases with long-standing disease that had not responded to a wide range of currently accepted treatment modalities. Over 95% had complete relief of symptoms and a significant reduction in signs of eyelid margin inflammation. 87% of cases required only one treatment cycle for significant improvement or complete remission of symptoms. A significant number also demonstrated reopening of previously closed meibomian gland orifices, reopening of previously blocked meibomian gland orifices, and reappearance of normal meibomian gland secretions. The majority of symptomatic cases of dry eye also showed significant improvement.

[0126] example All percentages recited herein refer to weight percent unless otherwise specified. The following non-limiting examples serve to illustrate embodiments of the present invention.

[0127] Example 1: method: The ingredients of Phase A (water, ivermectin, disodium EDTA) were added and stirred (until dissolved). Phase B (slurry of xanthan gum in propanediol) was added to the mixture of Phase A under low shear until a homogeneous gel was formed. The homogeneous gel was heated to 80°C.

[0128] The ingredients for Phase C (Glyceryl Stearate Citrate, Cetearyl Alcohol, Bis-Stearyl Ethylenediamine, Neopentyl Glycol, Stearyl Hydrogenated Dimer Dilinoleate Copolymer) were combined and heated to 80° C. The ingredients for Phase D (Dimethicone 350 cps and Dimethicone 500 cps, Ammonium and Sodium Acrylate Copolymer) were combined and added to the Phase C mixture and mixed until homogeneous.

[0129] The mixture obtained by adding phases C and D was added to the mixture obtained by adding phases A and B and stirred vigorously until homogeneous.

[0130] The mixture was cooled to below 40°C, then Phase E ingredients (phenoxyethanol, caprylyl glycol, tocopherol-D-alpha 70% Qs pH adjuster) were added and stirred until homogeneous. The pH was adjusted to between 6 and 7.

[0131] The ingredients and amounts used in Example 1 are summarized in Table 1. [Table 1]

[0132] Example 2: method: Phase A ingredients (deionized water and veegum) were mixed with high shear mixing until smooth.

[0133] Phase B (triethanolamine and propylene glycol) was added to the Phase A mixture and mixed until uniform.

[0134] Phase C (Xanthan Gum, Tocopherol-D-Alpha 70%) was added to the above mixture of Phases A and B and then mixed until uniform using high shear mixing.

[0135] Phase D (stearic acid, glyceryl stearate, oleyl alcohol) and Phase E (dimethicone 350 CPS, dimethicone 1000 CPS) were melted in separate containers to 75°C ± 5°C and then mixed with high shear mixing.

[0136] The mixture of Phases D, E and the mixture of Phases A, B, C were mixed together at high shear and cooled to 35°C ± 5°C.

[0137] Phase F (sterilized micronized ivermectin) was then added to the above mixture, mixed thoroughly and stored in a sterile container.

[0138] The ingredients and amounts used for Example 2 are summarized in Table 2. [Table 2]

[0139] Example 3: method: Phase A ingredients (deionized water and veegum) were mixed with high shear mixing until smooth.

[0140] Phase B (triethanolamine and propylene glycol) was added to the Phase A mixture and mixed until uniform.

[0141] Phase C (Xanthan Gum, Tocopherol-D-Alpha 70%) was added to the above mixture of Phases A and B and then mixed until uniform using high shear mixing.

[0142] Phase D (stearic acid, glyceryl stearate, oleyl alcohol) and Phase E (carnauba wax, white beeswax) were melted in separate containers to 75°C ± 5°C and then mixed with high shear mixing.

[0143] The mixture of Phases D, E and the mixture of Phases A, B, C were mixed together at high shear and cooled to 35°C ± 5°C.

[0144] Phase F (sterilized micronized ivermectin) was then added to the above mixture, mixed thoroughly and stored in a sterile container.

[0145] The ingredients and amounts used for Example 3 are summarized in Table 3. [Table 3]

[0146] The above pharmaceutical compositions are presented by way of example only and are not intended to limit the scope of the present invention. Variations in formulations can be formulated by those skilled in the art to precisely apply the composition from the most anterior eyelashes and adjacent skin to the eyelid margin, encompassing the keratinized skin from the eyelashes to the mucocutaneous junction on the eyelid margin and encompassing the orifices of the meibomian glands. These pharmaceutical compositions share the properties of rapid application and drying, forming a film-like structure on the eyelid margin, water resistance and waterproofing, resistance to dispersion and dissolution in the tear film, and durability to prevent accidental wiping or washing off. The pharmaceutical composition can penetrate through the orifices of the meibomian glands to the ampulla of the gland duct.

[0147] It will be readily apparent to those skilled in the art that further variations and modifications can readily be made in the practical implementation of the concepts described herein, or can be learned by practice of the invention, without departing from the spirit and scope of the invention as defined by the following claims.

Claims

1. A pharmaceutical composition for treating eyelid margin disorders, comprising: (a) an ophthalmically acceptable carrier; and (b) a therapeutically effective amount of about 0.001% to 20% by weight of a biologically active substance for application to the eyelid margin of a subject; Including, The pharmaceutical composition adheres to the eyelid margin and is resistant to dispersion or dissolution in the tear film.

2. The pharmaceutical composition is retained on the eyelid margin for about 6 to 12 hours, the topical application to the eyelid margin comprises topically administering the pharmaceutical composition to the eyelid margin of the subject, the eyelid margin extending proximally from the base of the eyelashes to the orifice of the meibomian gland distally, and including the orifice of the meibomian gland, wherein the topical application is periodic administration; 10. The pharmaceutical composition of claim 1, wherein the pharmaceutical composition is applied as frequently as required for therapeutic effect.

3. The eyelid margin disease is primary blepharitis, the primary blepharitis is primary anterior blepharitis or primary posterior blepharitis, and the primary blepharitis is not associated with or due to treatment for a bacterial infection, a mite infestation, rosacea, or psoriasis; 10. The pharmaceutical composition of claim 1, wherein the therapeutically effective amount of the biologically active substance is about 0.5% to 20% by weight.

4. The pharmaceutical composition is retained on the eyelid margin for about 6 to 12 hours, the topical application to the eyelid margin comprises topically administering the pharmaceutical composition to the eyelid margin of the subject, the eyelid margin extending proximally from the base of the eyelashes to the orifice of the meibomian gland distally, and including the orifice of the meibomian gland, wherein the topical application is periodic administration; 4. The pharmaceutical composition of claim 3, wherein the pharmaceutical composition is applied once daily for three days in a first cycle and again for three days in a second cycle, the second cycle starting two weeks after the completion of the first cycle.

5. A pharmaceutical composition described in claim 1 or 3, wherein the biologically active substance is selected from the group consisting of antiparasitic agents, steroids, antibiotics, anti-inflammatory agents, anti-neoplastic agents, antivirals, growth factors and serum.

6. The method of claim 1 or 3, wherein the ophthalmologically acceptable carrier comprises at least one ophthalmologically acceptable excipient, and the ophthalmologically acceptable excipient is one or more selected from the group consisting of chelating agents, humectants, gums / thickeners, emulsifiers, waterproofing agents, bases, preservatives, antioxidants, pH adjusters, and water.

7. The pharmaceutical composition of claim 6, wherein the chelating agent is present in a range of approximately 0.1% to 5.0% by weight of the total composition, and the chelating agent is disodium ethylenediaminetetraacetic acid.

8. The pharmaceutical composition of claim 6, wherein the humectant is present in a range of approximately 0.5% to 5.0% by weight of the total composition, and the humectant is selected from the group consisting of glycerin, propanediol, and propylene glycol.

9. The pharmaceutical composition of claim 6, wherein the gum or thickener is present in a range of approximately 0.2% to 2.0% by weight of the total composition, and the gum or thickener is selected from the group consisting of guar gum, hydroxyethyl cellulose, xanthan gum, veegum gel, magnesium stearate, and magnesium myristate.

10. The pharmaceutical composition of claim 6, wherein the emulsifier is selected from the group consisting of anionic emulsifiers and nonionic emulsifiers.

11. The pharmaceutical composition of claim 6, wherein the anionic emulsifier is present in a range of approximately 0.3% to 3.0% by weight of the total composition, and the anionic emulsifier is selected from the group consisting of glyceryl stearate citrate, sodium stearoyl glutamate, and glyceryl stearate SE.

12. The pharmaceutical composition of claim 6, wherein the non-ionic emulsifier is present in the range of approximately 3% to 10% by weight of the total composition, and the non-ionic emulsifier is selected from the group consisting of cetearyl alcohol, cetearyl alcohol / polysorbate 60, and glyceryl stearate / PEG-100 stearate.

13. The pharmaceutical composition of claim 6, wherein the waterproofing agent is present in the range of about 5% to 12% by weight of the total composition, and the waterproofing agent is selected from the group consisting of bis-stearyl ethylenediamine, neopentyl glycol, stearyl hydrogenated dimer dilinoleate copolymer (Sylvaclear C75V) and ethylenediamine / hydrogenated dimer dilinoleate copolymer bis-di-C 14-18 alkylamide (Sylvaclear A200V).

14. The pharmaceutical composition of claim 6, wherein the base is present in the range of approximately 10% to 45% by weight of the total composition, and the base is selected from the group consisting of silicone oil, dimethicone 350 cps, dimethicone 500 cps, dimethicone 1000 cps, wax, and acrylate copolymer.

15. The pharmaceutical composition of claim 6, wherein the preservative is present in the range of approximately 0.5% to 3% by weight of the total composition, and the preservative is selected from the group consisting of phenoxyethanol and caprylyl glycol.

16. The pharmaceutical composition of claim 6, wherein the antioxidant is present in the range of approximately 0.01% to 0.5% by weight of the total composition, and the antioxidant is tocopherol D-alpha 50%.

17. A pharmaceutical composition described in claim 1 or 3, wherein the pharmaceutical composition has a pH between 5 and 8.

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