My shizophrenic dad drinks alchohol, I think on weekends. How bad is this?

For him drug induced from hard drugs, not stimulants but his schizophrenia got so bad that only clozapine works so I think that’s one of the last resort ones, because he wouldent stop drug use till later then it was to late.

Now I’m extremly terrified for his mental and psychical health.

He shows signs of confusion disorientation when he is on it.

My question is can his psychosis come back? And what else can happen what do you think he experiences when drunk?

And how to get him to stop. And when he’s drunk he also repeats things verbally and psychically multiple times. Like open a book close it open it up again after a while close it, or go lay in bed seconds later get up stuff like that etc.