be·ta-block·er 
(bātə-blŏk′ər, bē-)
(bātə-blŏk′ər, bē-)n.
A drug that blocks beta-receptors, thus counteracting the excitatory effects of norepinephrine and other beta-agonists released from sympathetic nerve endings. Beta-blockers are used primarily to treat angina, hypertension, arrhythmia, and migraine. Also called beta-adrenergic antagonist, beta-adrenergic blocker.
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