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Possible warfarin interaction with menthol cough drops.

Paul J Kassebaum1, Don L Shaw, Dave J Tomich

  • 1Madigan Army Medical Center, Tacoma, WA, USA.

The Annals of Pharmacotherapy
|January 13, 2005
PubMed
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Menthol cough drops may interact with warfarin, potentially lowering the international normalized ratio (INR). This case highlights the importance of monitoring INR closely in patients using warfarin, especially when other factors like illness or new medications are involved.

Area of Science:

  • Pharmacology
  • Drug Interactions
  • Clinical Case Reports

Background:

  • Warfarin is a common anticoagulant used to prevent blood clots.
  • Maintaining a stable international normalized ratio (INR) is crucial for warfarin efficacy and safety.
  • Patients on warfarin therapy require regular monitoring of their INR levels.

Observation:

  • A patient on a stable warfarin dose experienced a significant drop in INR after using menthol cough drops.
  • The patient also reported a flu-like illness during the same period.
  • No other potential causes for the decreased INR were identified.

Findings:

  • A possible interaction between menthol cough drops and warfarin was identified, leading to a decreased INR.
  • Menthol's pharmacokinetic effects on cytochrome P450 isoenzymes or drug absorption are potential, though unconfirmed, mechanisms.

Related Experiment Videos

  • This is the first reported case of an interaction between warfarin and menthol-containing cough drops.

    • Implications:

    • Healthcare providers should be aware of potential interactions between over-the-counter products like menthol cough drops and warfarin.
    • Close monitoring of INR is essential for patients on warfarin, particularly when concurrent illnesses or new substances are introduced.
    • Further research may be needed to elucidate the specific mechanisms of this drug interaction.