Fasting glucose will be measured at screening, week 4, and week 8 visits. This is done to monitor subjects for worsening glucose control. This is a possible concern due to the association between atypical antipsychotics, including risperidone, and hyperglycemia. Subjects who are discovered to either have diabetes or develop diabetes during the study or who have worsening glucose control (poor glucose control as judged by new-onset diabetes or new-onset glucose intolerance.) will be discontinued and referred to their primary care physician (PCP) for further work-up and treatment. In patients with established diabetes, the six weeks of active treatment will not be long enough to meaningfully judge if diabetes control is more difficult than usual (typical parameters of glucose control such as hemoglobin A1C are a reflection of long-term glucose control, i.e. several months). We will follow those patients clinically in cooperation with the PCP to decide if patients can stay in the trial. This additional blood test will not lead to additional blood draws but will simply be added to the subject's routine and mandated biweekly white blood cell count monitoring.