Inderal, a type of medication known as a beta blocker, is used in the treatment of high blood pressure, angina pectoris (chest pain, usually caused by lack of oxygen to the heart due to clogged arteries), changes in heart rhythm, prevention of migraine headache, hereditary tremors, hypertrophic subaortic stenosis (a condition related to exertional angina), and tumors of the adrenal gland. It is also used to reduce the risk of death from recurring heart attack.

When used for the treatment of high blood pressure, it is effective alone or combined with other high blood pressure medications, particularly thiazide-type diuretics. Beta blockers decrease the force and rate of heart contractions, reducing the heart's demand for oxygen and lowering blood pressure.