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Research ArticleArticle

Metabolism and Excretion of Rivaroxaban, an Oral, Direct Factor Xa Inhibitor, in Rats, Dogs, and Humans

C. Weinz, T. Schwarz, D. Kubitza, W. Mueck and D. Lang
Drug Metabolism and Disposition May 2009, 37 (5) 1056-1064; DOI: https://doi.org/10.1124/dmd.108.025569
C. Weinz
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T. Schwarz
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D. Kubitza
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W. Mueck
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D. Lang
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Abstract

Rivaroxaban is a novel, oral, direct factor Xa inhibitor for the prevention and treatment of thromboembolic disorders. The objective of this study was to investigate the in vivo metabolism and excretion of rivaroxaban in rats, dogs, and humans. Single doses of [14C]rivaroxaban (3 and 1 mg/kg) were administered to rats (orally/intravenously) and dogs (orally), respectively. A single oral dose of [14C]rivaroxaban (10 mg) was administered to healthy human males (n = 4). Plasma and excreta were collected and profiled for radioactivity. Recovery of total radioactivity was high and ≥92% in all species. Unchanged rivaroxaban was the major compound in plasma at all time points investigated, across all species. No major or pharmacologically active circulating metabolites were detected. Rivaroxaban and its metabolites were rapidly excreted; urinary excretion of radioactivity was 25 and 52%, and fecal excretion was 67 and 43% of the dose in rats and dogs, respectively. In humans, 66% of the dose was excreted renally (36% unchanged drug) and 28% in the feces. Radioactivity profiles in excreta were similar across species. Three metabolic pathways were identified: oxidative degradation of the morpholinone moiety (major pathway) and hydrolysis of the central amide bond and of the lactam amide bond in the morpholinone ring (minor pathways). M-1, the main metabolite in excreta of all species, was eliminated via both renal and fecal/biliary routes. In total, 82 to 89% of the dose administered was assigned to unchanged rivaroxaban and its metabolites in the excreta of rats, dogs, and humans.

Footnotes

  • This work was supported by Bayer HealthCare AG.

  • Article, publication date, and citation information can be found at http://dmd.aspetjournals.org.

  • doi:10.1124/dmd.108.025569.

  • ABBREVIATIONS: FXa, factor Xa; PK, pharmacokinetic; AUC, area under the concentration-time curve; BAY 59-7939, 5-chloro-N-({(5S)-2-oxo-3-[4-(3-oxo-4-morpholinyl)phenyl]-1,3-oxazolidin-5-yl}methyl)-2-thiophene-carboxamide; BDC, bile duct-cannulated; HPLC, high-performance liquid chromatography; LC, liquid chromatography; MS, mass spectrometry; MS/MS, tandem mass spectrometry; LLOQ, lower limit of quantitation.

    • Received November 11, 2008.
    • Accepted January 28, 2009.
  • The American Society for Pharmacology and Experimental Therapeutics
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Drug Metabolism and Disposition: 37 (5)
Drug Metabolism and Disposition
Vol. 37, Issue 5
1 May 2009
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Research ArticleArticle

Metabolism and Excretion of Rivaroxaban, an Oral, Direct Factor Xa Inhibitor, in Rats, Dogs, and Humans

C. Weinz, T. Schwarz, D. Kubitza, W. Mueck and D. Lang
Drug Metabolism and Disposition May 1, 2009, 37 (5) 1056-1064; DOI: https://doi.org/10.1124/dmd.108.025569

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Research ArticleArticle

Metabolism and Excretion of Rivaroxaban, an Oral, Direct Factor Xa Inhibitor, in Rats, Dogs, and Humans

C. Weinz, T. Schwarz, D. Kubitza, W. Mueck and D. Lang
Drug Metabolism and Disposition May 1, 2009, 37 (5) 1056-1064; DOI: https://doi.org/10.1124/dmd.108.025569
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