drugs are used to treat symptoms such as delusions
1 Doctors prescribe these medications to treat psychotic symptoms, such as delusions, paranoia and hallucinations. 2  In addition to paliperidone (Invega), other antipsychotic medications that may be prescribed include clozapine (Clozaril), risperidone (Risperdal), olanzapine (Zyprexa) and haloperidol (Haldol).