The lack of effective medications for the symptoms of anorexia nervosa (AN), combined with early promising findings in case reports (Risperidone and Olanzapine) and one open study of olanzapine have led to increased use of these medications for individuals with AN. This double-blind placebo controlled study of risperidone will attempt to determine if risperidone is effective in decreasing core symptoms of anorexia nervosa and decreasing the length of time required to reach and maintain at or about 90% Ideal body weight. The safety of risperidone in this population will also be examined through monitoring of Extrapyramidal Symptoms, Tardive Dyskinesia, Electrocardiograms's, Resting Energy Expenditure, liver enzymes and other blood chemistry. Other possible variables which may mediate the recovery process or be impacted by risperidone,such as leptin and anxiety symptoms are also being measured.
