Genetics of Nevirapine Metabolic Pathways at Steady State in HIV-Infected Cambodians.

Nevirapine is metabolized by several hepatic cytochrome P450 (CYP) isoforms to generate four primary hydroxylated metabolites: 2-hydroxynevirapine, 3-hydroxynevirapine, 8-hydroxynevirapine, and 12-hydroxynevirapine. The present study characterized associations between genetic polymorphisms and metabolite ratios in HIV-infected Cambodians. We demonstrate associations between CYP2B6 polymorphisms and metabolite ratios for both 3-hydroxynevirapine and 8-hydroxynevirapine, suggesting involvement of CYP2B6 in generating these metabolites.