Antipsychotic Polypharmacy in Schizophrenia

"Primary antipsychotic medication (olanzapine, oral risperidone, seroquel, clozapine, haldol, perphenazine) will be determined by the treating physician and participants will continue taking the concomitant antipsychotic drug. The dose of the main antipsychotic drug will remain open and flexible at the discretion of the attending physician. The dose of the second antipsychotic drug will remain fixed throughout the study period."

"The main antipsychotic drug will be determined by the treating physician. Participants will be allocated to placebo in place of the concomitant antipsychotic drug. The dose of the main antipsychotic drug will remain open and flexible at the discretion of the attending physician."