Proguanil metabolism in relation to S-mephenytoin oxidation in a Turkish population

British Journal of Clinical Pharmacology
N E BasciS O Kayaalp

Abstract

The oxidation of proguanil was studied in 89 unrelated healthy Turkish volunteers after administration of proguanil (single dose, 200 mg, orally). Based on the distribution of the ratio of proguanil to cycloguanil excreted in urine, and using an antimode value of 15, the prevalence of poor metabolizers in a Turkish population was estimated to be 5.6% (95% confidence interval 2.0%-17.3%) which was similar to that in the other Caucasian populations. The relationship between the oxidative capacities of CYP2C19 for the two substrates, proguanil and mephenytoin, was studied in 39 subjects (two poor and 37 extensive metabolizers of proguanil). The two poor metabolizers of proguanil were also identified as poor metabolizers of S-mephenytoin and no misclassification by the two phenotyping methods was observed. The correlation between the metabolic ratio of proguanil to cycloguanil and the S/R-mephenytoin ratio as assessed by Spearman's rank test, was statistically significant (rs = 0.50, P < 0.001).

Citations

Oct 15, 2014·Neurological Sciences : Official Journal of the Italian Neurological Society and of the Italian Society of Clinical Neurophysiology·Aydan OzkaynakciFiliz Yilmaz Onat
Oct 27, 2001·British Journal of Clinical Pharmacology·J A Goldstein
Jan 5, 2010·Drug Metabolism and Pharmacokinetics·Chakradhara Rao Uppugunduri SatyanarayanaAdithan Chandrasekaran
Jun 9, 2006·Medicina clínica·Hortensia Alonso-NavarroJosé A García-Agúndez

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