title: Association of CYP2B6, CYP3A5, and CYP2C19 genetic polymorphisms with sibutramine pharmacokinetics in healthy Korean subjects.
abstract: We assessed the association of CYP2B6, CYP3A5, and CYP2C19 polymorphisms with sibutramine pharmacokinetics. Forty six healthy male subjects were enrolled, and their CYP2B6 (*4 and *6), CYP3A5 (*3), and CYP2C19 (*2, and *3) genotypes were analyzed. After a single 15-mg dose of sibutramine was administered, plasma concentrations of sibutramine and its metabolites, M1 and M2, were measured. CYP2B6 and CYP3A5 polymorphisms did not affect the pharmacokinetics of sibutramine and its metabolites. However, the CYP2C19 genotype substantially influenced plasma levels of sibutramine and its metabolites. The mean area under the curve (AUC) of sibutramine in CYP2C19 intermediate metabolizers (IMs; *1/*2 or *1/*3) and poor metabolizers (PMs; *2/*2, *2/*3)) was 18.5 and 252.2% higher, respectively, than the AUC in extensive metabolizers (EMs, *1/*1) (P < 0.001). The AUC of M1 metabolite in IMs and PMs was 22.5 and 148.0% higher, respectively, than that of EMs (P < 0.001). Our findings indicate that the CYP2C19 genotype substantially affects the pharmacokinetics of sibutramine.
authors.affiliation: Department of Clinical Pharmacology and Toxicology, Anam Hospital, Korea University College of Medicine, Seoul, Korea.
authors.forename: K A
authors.initials: KA
authors.lastname: Kim
authors.forename: W K
authors.initials: WK
authors.lastname: Song
authors.forename: J Y
authors.initials: JY
authors.lastname: Park
mesh_terms: D000328:Adult; D001067:Appetite Depressants / Q000493:pharmacokinetics*; D019540:Area Under Curve; D001189:Aryl Hydrocarbon Hydroxylases / Q000235:genetics*; D044466:Asian People; D003503:Cyclobutanes / Q000493:pharmacokinetics*; D065702:Cytochrome P-450 CYP2B6; D065731:Cytochrome P-450 CYP2C19; D051544:Cytochrome P-450 CYP3A / Q000235:genetics; D005838:Genotype; D006801:Humans; D007723:Korea; D008297:Male; D010089:Oxidoreductases, N-Demethylating / Q000235:genetics; D011110:Polymorphism, Genetic; D055815:Young Adult
chemical_list: D001067:Appetite Depressants; D003503:Cyclobutanes; D001189:Aryl Hydrocarbon Hydroxylases; C585599:CYP2B6 protein, human; C045793:CYP2C19 protein, human; C510164:CYP3A5 protein, human; D065702:Cytochrome P-450 CYP2B6; D065731:Cytochrome P-450 CYP2C19; D051544:Cytochrome P-450 CYP3A; D010089:Oxidoreductases, N-Demethylating; C058254:sibutramine