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Can I take 10 and Warfarin together?

Drug interaction guide

Taking CBD (cannabidiol) with warfarin can significantly increase the levels of warfarin in your blood. This makes your blood much thinner than intended, which greatly increases your risk of serious bleeding, such as internal bleeding or heavy bruising.

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Why this happens

Both CBD and warfarin are broken down by the same enzymes in the liver. CBD blocks these enzymes, which stops the body from clearing the warfarin away. This leads to a 'backlog' of warfarin building up in your system.

You must speak to your doctor or pharmacist before using CBD if you are taking warfarin. If you decide to use both, your doctor will need to monitor your blood clotting levels (INR) much more frequently and will likely need to reduce your warfarin dose. Seek immediate medical help if you notice unusual bruising, nosebleeds, or blood in your urine or stools.

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Taking multiple medicines? Our Medicines Interaction Checker helps you check whether your prescriptions, over-the-counter medicines, and supplements are safe to take together. Simply search for your medicines to see potential interactions and what to do about them.

Disclaimer

This information is for general educational purposes only and should not be relied upon as a substitute for professional medical advice. Always consult your GP, pharmacist, or another qualified healthcare professional before making decisions about your medications. Individual circumstances may vary, and only a healthcare professional who knows your medical history can provide personalised guidance.

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Article history

The information on this page is written and peer reviewed by qualified clinicians.

  • 14 Mar 2026 | Originally published
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