The Assessment of a Weight-Gain Agent for the Treatment of Olanzapine-Associated Anti-Obesity Agent in Patients With Schizophrenia, Schizophreniform Disorder, Schizoaffective Disorder, and Bipolar I Disorder

Eligibility Criteria: * You must be between the ages of 18 and 65. If you have reached your 66th birthday, you will not be able to participate. * You must have been diagnosed with schizophrenia, schizoaffective disorder, schizophreniform disorder, or bipolar I disorder and be taking olanzapine. * You must be able to visit the doctor's office as scheduled for the next 4 months. Exclusion Criteria: * You have a history of an illness that would cause weight loss or gain in the near future. * You have taken remoxipride within the past 6 months. * You are allergic to olanzapine or Anti-obesity Agent. * You have uncontrolled high blood pressure, congestive heart failure, or have had a stroke. * You have a serious medical illness, such as heart, liver, or kidney disease. * You are pregnant or breast feeding.