Propranolol is a non-selective beta-adrenergic antagonist (beta-blocker) commonly used to treat various conditions, including hypertension, anxiety, and certain types of heart disorders. It works by blocking the effects of adrenaline on beta receptors, leading to a decrease in heart rate and blood pressure. Additionally, it can help alleviate physical symptoms of anxiety, such as rapid heartbeat. Propranolol is also used in the prevention of migraines and to manage performance anxiety.