This study explored posttraumatic stress disorder (PTSD) among suicide attempters. Participants were 330 hospital-treated deliberate self-poisoning (DSP) patients. Twelve-month prevalence of PTSD and comorbid psychiatric disorders was determined using the Composite International Diagnostic Interview (CIDI-A). Standard disability measures and demographic information were also obtained. PTSD prevalence was 32% among women and 15% among men. The PTSD group had significantly higher levels of affective disorder, anxiety disorders other than PTSD, psychiatric disability, and service utilization than DSP patients without PTSD. Logistic regression modeling showed that PTSD was associated with the type of traumatic event, number of events, affective disorder, and anxiety disorder other than PTSD.