Methods and compositions are disclosed for rapidly relieving symptoms in subjects with depressive,
stressor and
substance abuse conditions, e.g., major depression, treatment-resistant depression, post-partum depression, bipolar depression, post-traumatic stress disorder,
substance use disorders, negative and cognitive symptoms of
schizophrenia, as well as for slowing progression of mild
cognitive impairment and
dementia, using an
intermittent dosing regimen of
memantine or
amantadine or a structural analogue or pharmaceutically acceptable salt of
memantine or
amantadine (optionally no more frequently than every 2 days) at a
dose sufficient to activate Set A brain structures, in combination with a second
drug at a
dose which activates Set B brain structures but which does not appreciably evoke brain activity linked to hallucinogenic and other psychotomimetic perceptions. In some instances the second
drug is either 1) a
low dose psilocybin or
low dose of other psychedelic and
stimulant molecules capable of activating Set B of brain structures which is administered at a
dose low enough such that it does not appreciably evoke brain activity linked to hallucinogenic and other psychotomimetic perceptions, or is 2) mianserin (S isomer, R isomer, or a racemate comprising both isomers or
structural analog or pharmaceutically acceptable salt thereof) or another
standard of care antidepressant capable of activating Set B brain structures, or 3) lumateperone or another
antipsychotic capable of activating Set B brain structures.