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- W2051566172 abstract "A patient who had taken a stable dose of phenytoin for 2 years had a coronary stent placed for unstable angina and ticlopidine was added to his therapeutic regimen. Twenty-five days later, he was hospitalized with acute symptomatic phenytoin toxicity and a serum concentration of 46.5 micrograms/ml. Determination of metabolic genotype revealed that the patient had a wild-type genotype for CYP2C9, CYP2C19, and CYP2D6. Using human liver microsomes, we showed that ticlopidine is a potent inhibitor of cytochrome P450 2C19, with an estimated inhibition constant (Ki) of 3.7 +/- 0.2 mumol/L. The influence of ticlopidine on CYP2C9, the other cytochrome P450 isoform that metabolizes phenytoin, is relatively weak, with a calculated Ki of 38.8 +/- 27 mumol/L. These data suggest that, in this patient, phenytoin toxicity was caused by inhibition of CYP2C19 by ticlopidine, and the data emphasize the importance of CYP2C19 in the metabolism of phenytoin." @default.
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- W2051566172 date "1997-11-01" @default.
- W2051566172 modified "2023-10-18" @default.
- W2051566172 title "Ticlopidine inhibition of phenytoin metabolism mediated by potent inhibition of CYP2C19*" @default.
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- W2051566172 doi "https://doi.org/10.1016/s0009-9236(97)90054-0" @default.
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