<p>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.<br />
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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.</p>