Propranolol is antihypertensive, and preferably used under medical supervision. People who stutter have a higher percentage of social anxiety disorder, which is basically excessive worries of being viewed negatively by others. One of the treatments of social anxiety disorder is propranolol to be used before the feared public situations, should be prescribed by a doctor (just to monitor side effects, and to exclude contra indications of the medication). How does propranolol help in performance (public speaking) anxiety? It lowers blood pressure, pulse, and tension in the body, and that is usually high in public speaking which increases anxiety. in individuals who stutter, this type of anxiety increases stuttering significantly. There are other treatment options for social anxiety, which are very helpful. Before using any medications, I suggest following up with a doctor.