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Propranolol Hydrochloride is a B-adrenergic receptor blocking drug which is widely used in hypertension and angina pectoris. Propranolol antagonizes catecholamines at B-adrenergic receptors, thus prevents excess rate and force of contraction of the heart and decreases the excess consumption of oxygen by the heart.
Propranolol is almost completely absorbed from the gastrointestinal tract, but a portion is immediately metabolized by the liver when passing through the portal circulation. Peak plasma concentration occurs in 1 to 1.5 hours after oral administration. The plasma half-life of propranolol is from 3 to 6 hours. The metabolites of propranolol are excreted through the urine.