Fluvastatin selectively inhibits a major drug metabolising enzyme (CYP2C9), the (+)-isomer (pharmacologically more active) showing 4-5 fold higher affinity. As already reported for lovastatin and simvastatin, in vivo drug interactions by inhibition of liver oxidation of CYP2C9 substrates (e.g. hypoglyceamic sulphonylureas and oral anticoagulants) may be expected.
Interactions between fluvastatin and P450TB substrates (phenytoin, oral anticoagulants, oral hypoglycemic agents, and nonsteroidal antiinflammatory drugs) may occur, at least in some patients.
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