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The estrogen hypothesis of schizophrenia postulates that estrogen exerts a protective effect against schizophrenia and that this partly explains the observed sex differences in premorbid adjustment, onset age, treatment response, and illness course. It has been suggested that estrogen supplementation can augment the treatment effects of antipsychotics. The purpose of the present investigation was to access the efficacy of ethinyl estradiol as an adjuvant agent in the treatment of premenopausal women with chronic schizophrenia in an 8-week, double-blind, and placebo-controlled trial. Eligible participants in the study were 32 women of childbearing age with schizophrenia. All patients were inpatients, in the active phase of illness, and met DSM-IV criteria for chronic schizophrenia. Patients were allocated in a random fashion, 16 to haloperidol 15 mg/day plus ethinyl estradiol 0.05 mg/day and 16 to haloperidol 15 …