Just as schizophrenia and bipolar disorder are considered serious mental illnesses, so should posttraumatic stress disorder (PTSD), a condition whose prevalence in the United States exceeds the combined prevalences of these other two disorders. People who have PTSD can expect, on average, to endure over two decades of active symptoms and to miss almost 1 day of work per week. They have a 20% chance of attempting suicide, an outcome that is not fully explained by the presence of comorbid depression (1, 2). The destructive effect of PTSD on intimate attachments and sources of support is well recognized. Overall, PTSD imposes a heavy burden on the health care system (3).