something i've found helpful in the past is a [very] low dose i.e 1-3mg pd of Risperidone being taken for the prevention of complete psychosis and psychotic symptoms.
sorry i couldn't help about the quetiapine as i can't remember as it never helped when i took so i switched over to another medication.
when i first when psychotic, to the point of being admitted they put me on Olanzapine at a high dose but i cant remember what exact dose and it would depend on the person and severity of symptoms i think. Olanzapine has been the worst one i've taken for side effects but it tends to be a case of the symptoms being so bad that the side effects are good compared to how ill the person had to be to go on it.
i hope this all made sense.
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