Competitive antagonist

A competitive antagonist is a receptor antagonistthat binds to a receptorbut fails to activate it. If an agonistcompetes with a competitive antagonist for the same binding siteon the same receptor, the agonist moleculescan be displaced from the binding site, resulting in a lower frequency of receptor activation.

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It uses material from the http://en.wikipedia.org/wiki/Competitive+antagonist Wikipedia article Competitive antagonist.