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An interaction between warfarin and cannabidiol, a case report
Leslie Grayson1, Brannon Vines1, Kate Nichol2
1University of Alabama at Birmingham, United States.
Epilepsy & Behavior Case Reports
|February 2, 2018
Summary
Warfarin drug interactions with cannabidiol (CBD) can increase bleeding risk. Monitor International Normalized Ratio (INR) levels closely when starting cannabinoid therapy alongside warfarin.
Area of Science:
- Pharmacology
- Drug Metabolism
- Clinical Toxicology
Background:
- Warfarin is a widely prescribed anticoagulant.
- Cannabidiol (CBD), a non-psychoactive cannabinoid, is increasingly used for various medical conditions.
- Potential drug interactions between warfarin and CBD require thorough investigation.
Observation:
- A clinical interaction between warfarin and cannabidiol has been observed.
- This interaction may lead to altered warfarin efficacy and safety.
Findings:
- Review of cannabidiol and warfarin metabolism highlights potential mechanisms for interaction.
- A proposed mechanism involves the inhibition of cytochrome P450 enzymes responsible for warfarin metabolism.
- This inhibition can lead to increased warfarin levels and International Normalized Ratio (INR).
Implications:
- Patients on warfarin therapy should be closely monitored for changes in INR when initiating or altering cannabinoid use.
- Healthcare providers should be aware of this potential drug interaction to prevent adverse events.
- Further research is warranted to fully elucidate the pharmacokinetic and pharmacodynamic interactions between warfarin and cannabinoids.
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