Abstract
Risperidone is metabolized to its active metabolite, 9-hydroxyrisperidone, mainly by the cytochrome P450 enzymes CYP2D6 and 3A4. Its antipsychotic effect is assumed to be related to the active moiety, that is, the sum of risperidone and 9-hydroxyrisperidone. Both risperidone and 9-hydroxyrisperidone are substrates of P-glycoprotein (P-gp), a transport protein involved in drug absorption, distribution, and elimination. The aim of the present study was to evaluate the influence of polymorphisms in genes encoding CYP3A5 and P-gp (ABCB1) on the steady-state plasma levels of risperidone, 9-hydroxyrisperidone, and the active moiety, taking CYP2D6 genotype status into account. Forty-six white patients with schizophrenia treated with risperidone (1-10 mg/d) in monotherapy for 4-6 weeks were genotyped, and their plasma concentrations of risperidone and 9-hydroxyrisperidone were measured. Dose-corrected plasma concentrations (C/D) of risperidone, 9-hydroxyrisperidone, and active moiety showed up to 68-, 9-, and 10-fold interindividual variation, respectively. Six patients carried 1 CYP3A5*1 allele and therefore were likely to express the CYP3A5 enzyme. The CYP3A5 genotype did not influence risperidone, 9-hydroxyrisperidone, or active moi...Continue Reading
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