That is, if an anti-psychotic is a drug that relieves or minimizes psychotic symptoms, are there any drugs or poisons that induce them? Psychedelics can induce hallucinations and delusions but the effects are still distinguishable from schizophrenia, so they don’t quite fit the bill.
Some stimulants, such as amphetamines, are known to sometimes cause psychosis, but I would hesitate to call a stimulant an anti-anti-psychotic per se. It’s not like you can take a Haldol and an equivalent amount of Adderall and expect that they will exactly cancel each other out.
Amphetamines and Parkinson drugs would probably have the opposite effect of antipsychotics. However antipsychotics work on various receptors in various ways, but a major pathway is antagonism of the d2 receptor . agonists of d2 do generally have some opposing symptoms of antagonists. Weight loss, less need for sleep, psychosis and paranoia, etc. The opposite of antipsychotics. But I don’t understand the details beyond that.
So you’re asking for pro-psychosis agents? Lack of sleep, for one.