Schizophrenia is a mental disorder in which you hear or feel things that are not there, believe things that are not true or feel unusually suspicious, anxious, confused, guilty, tensed, or depressed. Major depressive disorder is a mental illness characterized by persistent sadness or depressed mood with loss of interest in activities that can affect your daily life.
Quetiapine is an atypical antipsychotic. It acts by modulating the activities of certain brain chemicals (dopamine and serotonin) in the brain that causes mental disorders. As a result, it improves the positive and negative symptoms of schizophrenia and bipolar disorder.