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Interaction potential between cranberry juice and warfarin.

David Q Pham1, Antony Q Pham

  • 1Arnold & Marie Schwartz College of Pharmacy and Health Sciences, Long Island University, 75 DeKalb Avenue, Brooklyn, NY 11201, USA. david.pham@liu.edu

American Journal of Health-System Pharmacy : AJHP : Official Journal of the American Society of Health-System Pharmacists
|February 27, 2007
PubMed
Summary
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Cranberry juice and warfarin interaction potential is debated. While some reports suggest an interaction, current clinical trials show no significant effect, though caution is advised for patients on warfarin.

Area of Science:

  • Pharmacology
  • Drug Interactions
  • Nutritional Science

Background:

  • Warfarin is a widely used oral anticoagulant.
  • Cranberry juice contains flavonoids that may affect drug metabolism.
  • Concerns exist regarding potential interactions between cranberry juice and warfarin.

Observation:

  • Case reports suggest cranberry juice may increase International Normalized Ratio (INR) in warfarin patients.
  • Clinical trials using metabolic surrogates did not find interactions with key cytochrome P-450 (CYP) isoenzymes involved in warfarin metabolism.
  • Evidence for a clinically significant interaction remains inconclusive.

Findings:

  • Limited evidence suggests cranberry juice might influence warfarin metabolism.
  • Clinical trials indicate no significant interaction with CYP2C9 and CYP3A enzymes crucial for warfarin.

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  • Further research is needed to definitively assess the warfarin-cranberry juice interaction.

    • Implications:

    • Current data do not support a clinically relevant interaction between cranberry juice and warfarin.
    • Patients on warfarin should be informed about potential risks and monitored for INR changes and bleeding.
    • Prudent monitoring is recommended when cranberry juice is consumed by patients on warfarin therapy.