How do you spell Hannukah?
any of various drugs that prevent the stimulation of alpha-adrenergic receptors that increase blood pressure
alpha-blocker al·pha-block·er (āl'fə-blŏk'ər)
A drug that opposes the excitatory effects of norepinephrine released from sympathetic nerve endings at alpha receptors and causes vasodilation and a decrease in blood pressure. Also called alpha-adrenergic blocking agent.