Abstract:
:Lornoxicam is extensively metabolized by CYP2C9, and a CYP2C9*13 is one of the principal variant alleles in East Asian populations. The aim of this study was to evaluate the effects of CYP2C9*1/*13 on the pharmacokinetic parameters of lornoxicam in healthy individuals. A single oral dose of 8 mg lornoxicam was given to 22 Korean volunteers with different CYP2C9 genotypes (8, 8 and 6 carriers of CYP2C9*1/*1, *1/*3 and *1/*13 genotypes, respectively). Lornoxicam and 5'-hydroxylornoxicam levels were analysed using HPLC-UV in plasma samples collected up to 24 hr after taking the drug. In individuals with CYP2C9*1/*13, lornoxicam had a higher C(max) (p < 0.001), a longer half-life (p < 0.001), a lower oral clearance (p < 0.001) and a higher area under the plasma concentration-time curve from zero to infinity (AUC(inf) ) than in CYP2C9*1/*1 individuals (p < 0.001). The C(max) and AUC(inf) of 5'-hydroxylornoxicam were lower in CYP2C9*1/*13 individuals than in CYP2C9*1/*1 individuals, but the half-life of 5'-hydroxylornoxicam did not differ between the two groups. The half-life, oral clearance and AUC(inf) of lornoxicam were similar in individuals with CYP2C9*1/*13 and those with CYP2C9*1/*3. The C(max) , half-life and AUC(inf) of 5'-hydroxylornoxicam were also similar in both groups, although C(max) was higher in CYP2C9*1/*13 individuals (p < 0.01). A CYP2C9*1/*13 genotype markedly reduced the conversion of lornoxicam to 5'-hydroxylornoxicam, to a similar extent as that observed with the CYP2C9*1/*3 genotype.
journal_name
Basic Clin Pharmacol Toxicoljournal_title
Basic & clinical pharmacology & toxicologyauthors
Choi CI,Kim MJ,Jang CG,Park YS,Bae JW,Lee SYdoi
10.1111/j.1742-7843.2011.00751.xsubject
Has Abstractpub_date
2011-12-01 00:00:00pages
476-80issue
6eissn
1742-7835issn
1742-7843journal_volume
109pub_type
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