{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,28]],"date-time":"2026-02-28T19:11:17Z","timestamp":1772305877475,"version":"3.50.1"},"reference-count":36,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2016,5,19]],"date-time":"2016-05-19T00:00:00Z","timestamp":1463616000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Drug Testing and Analysis"],"published-print":{"date-parts":[[2017,4]]},"abstract":"<jats:p>CYP2C19 is an important member of the cytochrome P450 (CYP450) enzyme super family and is responsible for clearing approximately 10% of commonly used clinical drugs that undergo phase I metabolism. Genetic polymorphisms of CYP2C19 significantly influence the efficacy and safety of some drugs, which might cause undesirable adverse effects or cure failure at standard dosages. The aim of this study was to clarify the catalytic activities of 31 CYP2C19 alleles on the oxidative <jats:italic>in vitro<\/jats:italic> metabolism of methadone. Insect microsomes expressing the CYP2C19 alleles were incubated with 50\u20132000\u2009\u03bcM methadone for 30\u2009min at 37\u2009\u00b0C and terminated by cooling to \u201080\u2009\u00b0C immediately. Methadone and its metabolite EDDP were analyzed by an ultra performance liquid chromatography\u2010tandem mass spectrometry (UPLC\u2010MS\/MS) system. Of the 31 tested CYP2C19 allelies variants, CYP2C19*1 is the wild\u2010type. Compared with CYP2C19*1, two CYP2C19 variants (CYP2C19*3 and *35FS) had no detectable enzyme activity, one variant L16F exhibited slightly increased intrinsic clearance values, and one variant N277K showed no significant difference. In addition, 26 variants exhibited significantly decreased values (from 1.48% to 80.40%). These findings suggest that more attention should be paid in clinical administration of methadone to individuals carrying these CYP2C19 alleles. 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