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antagonist |
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antagonist 1. any muscle that opposes the action of another 2. a drug that counteracts the effects of another drug antagonist [an′tag·ə‚nist] (biochemistry) A molecule that bears sufficient structural similarity to a second molecule to compete with that molecule for binding sites on a third molecule. (pharmacology) A drug or other chemical substance capable of reducing the physiological activity of another chemical substance; refers especially to a drug that opposes the action of a drug or other chemical substance on the nervous system by combining with and blocking the nerve receptor. (physiology) A muscle that contracts with, and limits the action of, another muscle, called an agonist, with which it is paired. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| Therapy with H2 receptor antagonists has not been consistently successful, as Manning reported failure of this approach to control a bleeding Meckel diverticulum. a histamine H2 receptor antagonist, which inhibits gastric acid secretion; used as the base or the monohydrochloride salt in the treatment and prophylaxis of gastric or duodenal ulcers, gastroesophageal reflux disease, upper gastrointestinal bleeding, and conditions associated with gastric hypersecretion. a histamine H2 receptor antagonist, used as the hydrochloride salt to inhibit gastric acid secretion in the treatment of gastric and duodenal ulcer, gastroesophageal reflux disease, and conditions that cause gastric hypersecretion. |
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