Patients will be withdrawn from the study if they become suicidal or deteriorate psychiatrically. This will be assessed every 2 weeks using the PANSS and Calgary Depression Scale for Schizophrenia (CDSS): clinical deterioration will be defined as a 20% increase in total PANSS scores, and suicidality will be defined as a rating of "mild" (frequent thoughts of being better off dead, or occasional thought of suicide) on the CDSS. Subjects who have worsening symptoms of tardive dyskinesia (TD) will be discontinued and referred to their psychiatrist for further work-up and treatment (Worsening TD as judged by 20% increase in Abnormal Involuntary Movement Scale (AIMS)).