- alpha blocker, alpha-blocker, alpha-adrenergic blocker, alpha-adrenergic blocking agent - any of various drugs that block alpha-adrenergic receptors; used in treating benign prostatic hyperplasia; relaxes the muscles of the prostate and bladder
--1 is a kind of blocker, blocking agent
--1 has particulars: prazosin, Minipress; terazosin, Hytrin