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Labetalol is a competitive antagonist at b1 and b2 adrenoreceptors and has some intrinsic activity at b2 adrenoreceptors. Labetalol has, in addition to its b-blocking action, a competitive antagonist action at postsynaptic a-adrenoreceptors. In isolated tissues Labetalol is four to eight times more potent at b than a-adrenoreceptors.