 This medical study is an assessment of clinical response in women with Posttraumatic Stress Disorder PTSD due to domestic violence or rape trauma when treated with risperidone. Response to risperidone or placebo inactive drug is measured by Clinician Administered PTSD Scale CAPS and Treatment Outcomes PTSD Scale TOP-8. Second, the effect of risperidone on depressive and anxiety symptoms will be assessed using the Hamilton Rating Scale for Anxiety, Hamilton Rating Scale for Depression and the Clinical Global Impression. 