Doctor Explains Stagefright Medication. Source- maia_alessandraa on TT Propranolol is a widely used beta-blocker that can be very effective in treating conditions such as high blood pressure, anxiety, tremors, and certain heart rhythm disorders. It works by blocking the effects of adrenaline on the body, which helps to slow the heart rate, reduce blood pressure, and control physical symptoms of stress, such as shaking or a racing heartbeat. Because of its versatility, propranolol is often prescr