FYI: Schizophrenia and psychosis are two different things. The latter can be a symptom of the former. But psychoses can occur for many different reasons. They're quite common in bipolar disorder ("manic depression", during manic phases). And it isn't always about "hearing voices". Both of those seem like pretty common misconceptions.

I have a friend who trained themself to recognise the onset of their psychoses, and to only medicate when that happens. Antipsychotics can have pretty unpleasant side effects in many people. This strategy is not without risk.