 Posttraumatic Stress Disorder PTSD is a relatively common, distressing and disabling condition that may occur after trauma related events including injury. The emergence of Acute Stress Disorder shortly after the trauma appears to be a strong predictor of who will later develop PTSD Brewin et al., 1999. Although SSRIs are commonly administered in general medical practice and have been demonstrated effective for the treatment of PTSD, there has not been systematic study of their use for the treatment of ASD, ASD symptoms, or the prevention of PTSD, and this study represents one of the first attempts to systematically evaluate their use for this indication. 