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<p>for excretion. These pathways, especially those mediated by the <a href="page.php?w=Cytochrome_P450_oxidase">cytochrome P450</a> enzyme family, are major determinants of drug disposition and phenomena such as the <a href="page.php?w=first_pass_effect">first pass effect</a>.</p>

<p>Drug metabolism varies substantially among individuals and is influenced by factors including age, disease, diet, <a href="page.php?w=gut_microbiota">gut microbiota</a>, inherited genetic variation (<a href="page.php?w=pharmacogenetics">pharmacogenetics</a>), and exposure</p><p>
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