alpha blocker, alpha-adrenergic blocker, alpha-adrenergic blocking agent, alpha-blocker - any of various drugs that block alpha-adrenergic receptors; used in treating benign prostatic hyperplasia; relaxes the muscles of the prostate and bladder

beta blocker, beta-adrenergic blocker, beta-adrenergic blocking agent - any of various drugs used in treating hypertension or arrhythmia; decreases force and rate of heart contractions by blocking beta-adrenergic receptors of the autonomic nervous system

labetalol, labetalol hydrochloride, Normodyne, Trandate - antihypertensive drug (trade names Trandate and Normodyne) that blocks alpha and beta-adrenergic receptors of the sympathetic nervous system (leading to a decrease in blood pressure)

medicament, medication, medicinal drug, medicine - (medicine) something that treats or prevents or alleviates the symptoms of disease

agent - a substance that exerts some force or effect

neuromuscular blocking agent - a substance that interferes with the neural transmission between motor neurons and skeletal muscles