Schizophrenia, Psychoses in Parkinson's disease Indicated for reducing risk of recurrent suicidal behavior in patients with schizophrenia, or schizoaffective disorder in patients who are judged to be at chronic risk to re-experience suicidal behavior Treatment-resistant schizophrenia, in patients who fail to respond adequately to standard antipsychotic treatment Psychotic disorders in people with Parkinson's disease, when standard treatment has failed to control symptoms.