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  • Title: The influence of age and gender on the pharmacokinetics and pharmacodynamics of rivaroxaban--an oral, direct Factor Xa inhibitor.
    Author: Kubitza D, Becka M, Roth A, Mueck W.
    Journal: J Clin Pharmacol; 2013 Mar; 53(3):249-55. PubMed ID: 23381840.
    Abstract:
    A randomized, single-blind, placebo-controlled, parallel-group study was conducted to assess the effect of age and gender on the pharmacokinetics and pharmacodynamics of rivaroxaban - an oral, direct Factor Xa inhibitor. Subjects (n = 34) were enrolled into four groups: young males or females (aged 18-45 years) and elderly males or females (aged >75 years), and received a single dose of 10 mg rivaroxaban. Pharmacokinetic and pharmacodynamic parameters were determined. Gender had no significant influence on the pharmacokinetics and pharmacodynamics of rivaroxaban. The area under the concentration-time curve (AUC) of rivaroxaban was 41% higher in elderly compared with young subjects; corresponding AUC values for the inhibition of Factor Xa activity and prolongation of prothrombin time were also higher. These changes were the result of reduced rivaroxaban clearance in elderly subjects, mainly owing to decreased renal function. The influence of age was not considered clinically relevant. The maximum plasma concentration was not increased in elderly subjects, and pharmacodynamic parameters returned close to baseline within 24 hours. The results indicate that age alone and gender did not have a clinically relevant effect on the pharmacokinetics and pharmacodynamics of rivaroxaban in healthy subjects after a 10 mg dose.
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