 - Patients: Men and women between the ages 18 to 55 who meet the ICD-10 criteria for schizophrenia living in the catchment area of the psychiatric departments of Bispebjerg University Hospital, Psychiatric Center, Glostrup and Rigshospitalet. Patients can be either unmedicated, or need to be switched from other antipsychotic medications due to side-effects, or lack of effect on negative symptoms, positive symptoms, or cognitive function. 