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<p>A <b>receptor antagonist</b> is a type of <a href="page.php?w=Receptor_%28biochemistry%29">receptor</a> <a href="page.php?w=ligand_%28biochemistry%29">ligand</a> or <a href="page.php?w=drug">drug</a> that blocks or dampens a biological response by binding to and blocking a <a href="page.php?w=Receptor_%28biochemistry%29">receptor</a> rather than activating it like an <a href="page.php?w=agonist">agonist</a>. Antagonist drugs interfere in the natural operation of receptor proteins. They are sometimes called <b>blockers</b>; examples include <a href="page.php?w=alpha_blocker">alpha blocker</a>s,</p><p>
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