Statin drug interactions occur because of metabolism by which enzyme system?

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Statin interactions arise because these drugs are processed by the cytochrome P450 enzyme system in the liver. When a statin is taken with another drug that inhibits these enzymes, the statin is cleared more slowly, causing higher plasma levels and increasing the risk of muscle toxicity and liver injury. If a drug induces these enzymes, statin levels drop and the lipid-lowering effect may be reduced. This is why coadministration with inhibitors like certain macrolide antibiotics or azole antifungals can raise statin exposure, while inducers such as rifampin or certain anticonvulsants can diminish it. While some statins are less dependent on CYP enzymes (and others involve transporters), the general principle remains that CYP-mediated metabolism drives most statin interactions.