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Rifampicin reduces the plasma concentrations and the renin-inhibiting effect of aliskiren.

Author(s): Tapaninen T, Neuvonen PJ, Niemi M

Affiliation(s): Department of Clinical Pharmacology, University of Helsinki, Helsinki, Finland.

Publication date & source: 2010-05, Eur J Clin Pharmacol., 66(5):497-502. Epub 2010 Feb 24.

Publication type: Randomized Controlled Trial; Research Support, Non-U.S. Gov't

PURPOSE: This study aimed to investigate the effect of rifampicin, an inducer of CYP3A4 and P-glycoprotein, on the pharmacokinetics and pharmacodynamics of aliskiren, a renin inhibitor used in the treatment of hypertension. METHODS: In a randomized crossover study, 12 healthy volunteers took 600 mg rifampicin or placebo once daily for 5 days. On day 6, they ingested a single 150-mg dose of aliskiren. Plasma aliskiren concentrations were measured up to 72 h and urine concentrations up to 12 h; pharmacodynamic variables were measured up to 24 h. RESULTS: Rifampicin reduced the peak plasma aliskiren concentration (C(max)) by 39% (95% confidence interval 0.41, 0.90; P = 0.017) and the area under the plasma aliskiren concentration-time curve AUC(0-infinity) by 56% (95% confidence interval 0.35, 0.56; P < 0.001). Rifampicin had no significant effect on aliskiren elimination half-life (t(1/2)) or its renal clearance (Cl(renal)). Plasma renin activity 24 h after aliskiren intake was 61% higher during the rifampicin phase than during the placebo phase (P = 0.008). CONCLUSIONS: Rifampicin considerably reduces the plasma concentrations and the renin-inhibiting effect of aliskiren by decreasing its oral bioavailability.

Page last updated: 2010-10-05

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