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Related Experiment Videos

Warfarin and cranberry juice: an interaction?

Paul Grant1

  • 1Department of Surgery, William Harvey Hospital, Ashford, United Kingdom. drpaul.grant@orange.net

The Journal of Heart Valve Disease
|February 10, 2004
PubMed
Summary

Warfarin and cranberry juice interact, causing elevated INR and bleeding risks in patients with prosthetic mitral valves. Limit cranberry juice intake when on warfarin therapy to prevent adverse events.

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Area of Science:

  • Cardiology
  • Pharmacology
  • Clinical Medicine

Background:

  • Warfarin is a common anticoagulant medication.
  • Patients with prosthetic heart valves require regular monitoring of anticoagulation.
  • Cranberry juice is a popular beverage with potential drug interactions.

Observation:

  • A patient with a prosthetic mitral valve developed persistently elevated International Normalized Ratio (INR).
  • The INR elevation occurred two weeks after initiating regular cranberry juice consumption.
  • The patient experienced postoperative bleeding complications.

Findings:

  • A biologically plausible interaction between warfarin and cranberry juice is suspected.
  • Cranberry juice consumption can significantly increase INR levels.
  • This interaction poses a bleeding risk for patients on warfarin therapy.

Implications:

  • Patients prescribed warfarin should be advised to limit or avoid cranberry juice consumption.
  • Healthcare providers must consider dietary factors, like cranberry juice, in managing warfarin therapy.
  • This case highlights the importance of comprehensive patient counseling regarding potential food-drug interactions.

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