There have been major advances in the past decade concerning the psychobiology of PTSD, including structural and functional changes in the hippocampus, amygdala, and medial frontal cortex. The psychobiology is complex, involving deregulation of the HPA axis, as well as the noradrenergic, serotonergic, opioid, glutamatergic, and GABAergic pathways. All of this, in time, will lead to more case-specific pharmacological interventions. The APA Treatment Guideline for Patients With Posttraumatic Stress Disorder will be published in the near future and will lead to improved diagnosis and treatment.