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Labetalol is a beta blocker, or an antagonist of the β-adrenergic receptors. It is specifically a non-selective antagonist of the β 1 - and β 2 -adrenergic receptors. [13] Labetalol has intrinsic sympathomimetic activity. [13] It is also an antagonist of the α 1 -adrenergic receptor, and hence is additionally an alpha blocker. jago88 lol