Does The Addition Of Divalproex Sodium ER To An Atypical Antipsychotic Drug (APD) Improve Cognition And Psychopathology In Outpatients With Schizophrenia (SCH) Or Schizoaffective Disorder (SAD)?

Inclusion criteria * Male or female, age 18-65 * Diagnostic and Statistical Manual (DSM-IV) diagnosis of schizophrenia or schizoaffective disorder * Treated with olanzapine, aripiprazole, ziprasidone, quetiapine or risperidone monotherapy for at least three months prior to enrollment * Able to provide written consent Exclusion criteria * Primary DSM-IV diagnosis other than schizophrenia or schizoaffective disorder * Treatment with any antipsychotic other than olanzapine, aripiprazole, ziprasidone, quetiapine or risperidone in the past three months * Treatment with a mood stabilizer or an antidepressant continuously in the past three months. Patients who have had it for less than two weeks continuously will be permitted to enter. * Pregnant or lactating females