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  • Title: Aliskiren, a novel orally effective renin inhibitor, exhibits similar pharmacokinetics and pharmacodynamics in Japanese and Caucasian subjects.
    Author: Vaidyanathan S, Jermany J, Yeh C, Bizot MN, Camisasca R.
    Journal: Br J Clin Pharmacol; 2006 Dec; 62(6):690-8. PubMed ID: 17118124.
    Abstract:
    AIMS: Aliskiren is the first in a new class of orally effective renin inhibitors for the treatment of hypertension. This study compared the pharmacokinetic and pharmacodynamic properties of aliskiren in Japanese and Caucasian subjects. METHODS: In this open-label, single-centre, parallel-group, single- and multiple-dose study, 19 Japanese and 19 Caucasian healthy young male subjects received a single 300-mg oral dose of aliskiren on day 1 and then aliskiren 300 mg once daily on days 4-10. Blood samples were collected for the measurement of plasma aliskiren concentration, plasma renin concentration (PRC) and plasma renin activity (PRA). RESULTS: Pharmacokinetic parameters were comparable in Japanese and Caucasian subjects following administration of a single dose of aliskiren {ratio of geometric means: C(max) 1.12 [90% confidence interval (CI) 0.88, 1.43]; AUC(0-72 h) 1.19 [90% CI 1.02, 1.39]} and at steady state [mean ratio: C(max) 1.30 (90% CI 1.00, 1.70); AUC(0-tau) 1.16 (90% CI 0.95, 1.41)]. There was no notable difference in the plasma half-life of aliskiren between Japanese and Caucasian groups (29.7 +/- 10.2 h and 32.0 +/- 6.6 h, respectively). At steady state, peak PRC level and AUC for the concentration-time plot were not significantly different between Japanese and Caucasian subjects (P = 0.64 and P = 0.80, respectively). A single oral dose of aliskiren significantly reduced PRA to a similar extent in Japanese and Caucasian subjects (by 87.5% and 85.7%, respectively, compared with baseline; P < 0.01). Aliskiren was well tolerated by both ethnic groups. CONCLUSIONS: The oral renin inhibitor aliskiren demonstrated similar pharmacokinetic and pharmacodynamic properties in Japanese and Caucasian subjects.
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