Lead Sponsor

Yale University

Collaborators

Age

18 - 70 years

Sex

FEMALE

Healthy Volunteers

No

•Women between the ages of 18 to 70
•Meet DSM-IV (Diagnostic and Statistical Manual version IV) criteria for schizophrenia or schizoaffective disorder based on SCID (Structured Clinical Interview for the DSM-IV) interview
•Overweight, as defined with a BMI of equal to or greater than 27 kg/m² and continuing weight gain in the past year above 2% of previous years total body weight
•Be on a stable dose of antipsychotic medication; i.e. at least one month with no dosage change, and two months from an antipsychotic switch; 5) Deemed to be symptomatically stable by the clinical staff in the last two months

•Meet criteria for current alcohol or other substance dependence, opioid use for any reason or positive urine drug screen for opiates
•A history of dementia, mental retardation or other neurological disorder that may interfere with study ratings
•Not capable of giving informed consent for participation in this study
•Ongoing pregnancy
•Known sensitivity to naltrexone
•A medical disorder that is known to cause obesity
•Use of sibutramine, topiramate, amphetamines or over the counter weight remedies
•Impaired liver functions (greater than 3 times the upper limit of normal)
•Diagnosed with polycystic ovary syndrome
•Currently being treated with insulin
•Current use of Depo-Provera or any natural/synthetic hormone treatment known to cause significant weight gain

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