Overview Effect of Quetiapine on Negative Symptoms and Cognition Status: Completed Trial end date: 2003-01-01 Target enrollment: Participant gender: Summary The purpose of the study is to investigate the outcome on negative symptoms of schizophrenic patients during therapy with quetiapine or risperidone. Phase: Phase 3 Details Lead Sponsor: AstraZenecaTreatments: Quetiapine FumarateRisperidone