Propranolol is one of popular drugs also known as beta-blockers. The most important brand name for this medicine is Inderal. Propranolol acts to reduce hypertension, arrhythmia, migraines, and other heart conditions. It blocks the beta-adrenergic stimulation all over the body. This slows down the heart rate and reduces dilation of blood vessels. Propranolol is often used in combination with other drugs as well.