Volume 11 Supplement 1

5th International Conference on cGMP: Generators, Effectors and Therapeutic Implications

Open Access

No pharmacodynamic (PD) and pharmacokinetic (PK) interaction of riociguat (BAY 63-2521) and aspirin

  • Reiner Frey1Email author,
  • Wolfgang Mück1,
  • Sigrun Unger2,
  • Michael Reber1,
  • Jörn Krätzschmar1,
  • Corina Becker1 and
  • Georg Wensing1
BMC Pharmacology201111(Suppl 1):P25

https://doi.org/10.1186/1471-2210-11-S1-P25

Published: 1 August 2011

Objectives

Riociguat, an oral soluble guanylate cyclase (sGC) stimulator, is a new candidate for treatment of pulmonary hypertension (PH). Riociguat increases cGMP production through a novel dual mode of action: direct NO-independent stimulation of sGC and increasing sensitivity of sGC to low levels of NO. Another sGC stimulator, BAY 41-2272, has shown anti-platelet activity in animal models, as have BAY 41-2272 and riociguat in washed human platelets, although bleeding has not been noted as an adverse event (AE) in riociguat clinical studies [1, 2]. As riociguat and aspirin are likely to be used together in PH, it was of interest to investigate potential PD and PK interactions.

Methods

In this randomized, open-label, crossover study, participants took 2.5 mg/day riociguat, two morning doses of 500 mg aspirin, or both drugs concomitantly.

Results

Eighteen healthy men were enrolled. Six of 17 participants in the safety evaluation reported ≥1 treatment-emergent AE. All AEs were mild except 1 case of moderate headache following riociguat administration. Fifteen participants were valid for PD/PK analysis. Riociguat PK values were independent of aspirin coadministration. One hour after coadministration of riociguat and aspirin, the mean increase in fraction unbound was 19% for riociguat and 24% for its metabolite M-1 (BAY 60-4552) indicating mild displacement by salicylic acid, the main aspirin metabolite. Effects of aspirin on bleeding time, platelet aggregation and plasma thromboxane B2 were not affected by concomitant riociguat. Riociguat alone had no effect on PD variables.

Conclusion

Riociguat demonstrated no clinically relevant PD or PK interaction with aspirin. Coadministration of riociguat and aspirin does not require dose adjustment. Phase 3 randomized controlled trials are investigating riociguat in chronic thromboembolic pulmonary hypertension or pulmonary arterial hypertension.

Authors’ Affiliations

(1)
Clinical Pharmacology, Bayer HealthCare AG, Pharma Research Center
(2)
Global Biostatistics, Bayer HealthCare AG, Pharma Research Center

References

  1. Roger S, Badier-Commander C, Paysant J, Cordi A, Verbeuren TJ, Félétou M: The anti-aggregating effect of BAY 41-2272, a stimulator of soluble guanylyl cyclase, requires the presence of nitric oxide. Br J Pharmacol. 2010, 161: 1044-1058. 10.1111/j.1476-5381.2010.00943.x.PubMed CentralView ArticlePubMedGoogle Scholar
  2. Ghofrani HA, Hoeper MM, Halank M, Meyer FJ, Staehler G, Behr J, Ewert R, Weimann G, Grimminger F: Riociguat for chronic thromboembolic pulmonary hypertension and pulmonary arterial hypertension: a phase II study. Eur Respir J. 2010, 36: 792-799. 10.1183/09031936.00182909.View ArticlePubMedGoogle Scholar

Copyright

© Frey et al; licensee BioMed Central Ltd. 2011

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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