Study II - Controlled Study, Not Blind Inclusion and exclusion criteria Patients can be accepted to the study age 18-30, if admitting diagnosis after review by the study coordinator is schizophrenia or schizophreniform disorder by DSM-IV. Since the diagnosis of schizophrenia may be difficult in the early stages of acute psychotic disease, cases in which the clinical diagnosis is consistent with and suspicious of schizophrenia (and inconsistent with bipolar disorder) even if they do not fulfill all the diagnostic criteria in DSM-IV will be accepted. Patients with alcohol or drug abuse in the last 6 months will be excluded. Patients with significant physical illness including peptic ulcer, or a history of hepatitis or baseline abnormal liver function tests will be excluded. Patients with mental retardation will be excluded. Baseline screening will be done for liver function (including AST, bilirubin, alkaline phosphatase and LDH) and blood glucose and then repeated after 6 weeks. Elevations of AST over three fold will lead to dropping patient from study. Patients who are unlikely to be able to continue in the study as outpatients will be excluded. Patients will be admitted to study only if this is their first lifetime psychiatric admission and their first episode of psychosis and only if history supports that they have been mentally ill for less than one year.