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Drugs extensively metabolized by hepatic CYP450 enzymes
medication Under reviewThis is not a supplement, but a pharmacology concept describing medications that are broken down mainly by liver cytochrome P450 enzymes. The most clinically important CYP families in humans are CYP1 through CYP3, which account for most oxidative drug metabolism and a large share of elimination for common medicines. When a drug is extensively metabolized by CYP enzymes, its blood levels can change substantially if another substance inhibits or induces those enzymes. The practical importance of this topic is drug interaction risk. Foods, supplements, and medications that inhibit CYP enzymes can raise drug exposure and increase side effects, while inducers can lower drug exposure and reduce effectiveness. In healthy human studies, some supplements such as milk thistle and ginkgo have generally shown little or no meaningful effect on major CYP enzymes at typical doses, while other substances can alter CYP activity enough to matter clinically.
Research summary
The human literature consistently shows that CYP-mediated metabolism is central to many drug interactions. Reviews and FDA materials identify CYP enzymes as major determinants of how many drugs are cleared, and they emphasize that both inhibition and induction can lead to clinically relevant changes in drug exposure. However, real-world effects vary by compound, dose, formulation, and the specific CYP enzyme involved. For healthy human subjects, several controlled trials suggest that commonly used supplements such as milk thistle and ginkgo biloba do not significantly alter CYP1A2, CYP2C9, CYP2D6, or CYP3A4/5 activity at standard doses. By contrast, other natural products and dietary constituents have shown CYP-modulating effects in humans or strong potential for interaction, so the overall consensus is that CYP-mediated interactions are common enough to warrant caution whenever a drug relies heavily on hepatic CYP metabolism.
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Effect of health foods on cytochrome P450-mediated drug metabolism.
Various authors
Cytochrome P450 Enzymes and Drug Metabolism in Humans
Various authors
Inhibition and induction of CYP enzymes in humans: an update
Various authors
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Research (3 studies)
Cytochrome P450 Enzymes and Drug Metabolism in Humans
Various authors
Inhibition and induction of CYP enzymes in humans: an update
Various authors
Effect of health foods on cytochrome P450-mediated drug metabolism.
Various authors
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