<unk>  (trade name Brevibloc) is a cardioselective beta1 receptor blocker with rapid onset, a very short duration of action, and no significant intrinsic parasympathomimetic or membrane stabilising activity at therapeutic dosages.<unk>  decreases the force and rate of heart contractions by blocking beta-adrenergic receptors of the sympathetic nervous system, which are found in the heart, lungs and other organs of the body.<unk>  prevents the action of two naturally occurring substances: epinephrine and norepinephrine.
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