Predicting Responses to PTSD Treatment With Iris and Cardiovascular Tests

This is an antagonist of the alpha1 receptor for noradrenaline. It is FDA approved for the treatment of hypertension, and has also been used for benign prostatic hypertrophy (BPH). Most recently, it has been found to be helpful for symptoms of PTSD in some but not all participants.

This is a capsule containing an inert substance, in order to provide blinding to participants and study staff of when participants are on active medication and when they are not during the later portions of the trial.