In my case its not that antipsychotic stopped working, its the dose stopped working. I was taking 125mg clozapine without any problems then after 2 years, i suddenly became extremely psychotic. I was crying so loud that neighbors could hear it. I thought i would be in hospital again.
Then i talked with my pdoc, he told me to increase the dose, now I’m taking 275mg with no psychosis at all. Sometimes i get paranoid thoughts, but they go away on their own.