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Published on: September 30, 2021
Dosing-time-dependent effect of rivaroxaban on coagulation activity in rats
Yuki Fujiwara1, Hitoshi Ando2, Kentaro Ushijima2
1Division of Clinical Pharmacology, Department of Pharmacology, School of Medicine, Jichi Medical University, Shimotsuke, Japan; Department of Pharmaceutics and Drug Delivery, Faculty of Pharmaceutical Sciences, Tokyo University of Science, Noda, Japan.
Abstract:
The anticoagulant effect of rivaroxaban, a direct inhibitor of activated factor X (FX), might be influenced by its dosing time because the activity of the coagulofibrinolytic system exhibits daily rhythmicity. In rats, FX activity follows a 24-h rhythm with a peak in the middle of the light phase and a trough at the beginning of the dark phase. Consistent with these findings, a single dose of rivaroxaban had a stronger inhibitory effect on FX activity after dosing at the beginning of the light phase than after dosing at the beginning of the dark phase. A similar chronopharmacological effect was seen in a quantitative model of venous stasis thrombosis. In comparison, the dosing time had minimal influence on the pharmacokinetics of rivaroxaban. These data indicate that the anticoagulant effect of rivaroxaban is influenced by the dosing time. Further studies should confirm this finding in a clinical setting.
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