Research has identified a number of successful strategies for the treatment of PTSD, including both psychotherapy and pharmacology. Several treatments, including group psychotherapy and benzodiazepines have demonstrated a lack of efficacy in the treatment of PTSD. Despite this knowledge, many veterans with PTSD do not receive an evidence-based treatment and may even receive a treatment known to not be effective. Among the group of proven effective treatments, the patient time commitment and adverse effects differ considerably. Patients with PTSD are often ill informed about the available treatments, and there has been little formal effort aimed at matching the patients' preferences to a specific treatment.