Risperdal is heavy. It's prescribed when people are hearing voices, experiencing hallucinations and disorganized thinking. Withdrawal from Risperdal must be done very carefully.
Prozac is - of course - no walk in the park either.
He had a long history of disturbed and violent behavior and had been institutionalized twice before.
Why wasn’t he permanently or at least long-term institutionalized?
People who have bipolar disorder are notorious for ceasing their medications because they actually like the way it feels when they are on a run, so to speak. It frequently ends with suicide, btw.