Drugs like haloperidol have been studied and found to increase stimulant users' use of meth amphetamine & cocaine. When psychosis is caused by substance abuse, the only reasonable treatment is helping the person get their substance abuse under control. https://en.wikipedia.org/wiki/Substance-induced_psychosis

Robert Whitaker has covered research that finds the psychotics who do the best are those who are never exposed to antipsychotics. Those who do the second-best are those who are taken off antipsychotics as soon as possible. Those who do the worst, long-term, are those who are maintained on antipsychotics in perpetuity.

Psychiatric medications reduce patients' expected lifespan by 20 years. My aunt's friend had a psychotic break (emotional stress, iirc), was maintained on antipsychotics for life, and died of liver failure - I think she was in her early 60's.

SSRIs and ECT work by increasing the brain's production of allopregnanolone, just like in any other kind of brain damage.