Definition: A substance that prevents a vitamin from exerting its typical biologic effects. Most antivitamins have chemical structures like those of vitamins (pyridoxine and its antivitamin, deoxypyridoxine) and appear to function as competitive antagonists; some antivitamins produce effects, in addition, which are unrelated to vitamin antagonism.
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Examples: glitazone, GI cocktail, etc.
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