Supplement stacks / CBD + Warfarin
Can You Take CBD with Warfarin?
CBD and Warfarin: scored 5/10 (medium risk), set when we corrected this page on 4 November 2026 against the drug labels, NIH pages and published studies. The AI-written analysis had scored it 4/10 (high risk). Our interaction rules draw a Moderate warning for this pair; it is below. Not medical advice.
Safety at a glance
Medium riskWe set this score by hand, against the drug labels, NIH pages and published studies, in place of the AI-written analysis's own. Our interaction rules still check every page and can only make a result stricter, never milder. Informational only: it can't account for your medications, conditions, or genetics.
What the AI-written analysis says
Combining CBD with warfarin poses potential risks due to CBD's influence on liver enzymes that metabolize warfarin, which may lead to altered blood thinning effects. Close monitoring of INR levels is advised.
Warfarin is a prescription medication. This page describes publicly documented interactions — it can't see your dose, your other prescriptions, or your labs. Discuss any supplement with the prescriber or pharmacist who manages this medication before combining.
CBD
From the AI-written analysis.
Generally well-tolerated but can interact with medications metabolized by the liver.
Typical dosage: Varies by product — follow the label.
- Fatigue
- Diarrhea
- Changes in appetite
- Consult healthcare provider before use with anticoagulants like warfarin.
- Monitor for increased bleeding risk.
Warfarin
From the AI-written analysis.
Requires careful monitoring due to risk of bleeding; interactions can significantly alter its effectiveness.
Typical dosage: As prescribed or as directed on the label
- Bleeding
- Bruising
- Nausea
- Regular INR monitoring is essential.
- Avoid sudden changes in diet, especially vitamin K intake.
Timing
No timing arrangement makes this combination safe — see the warnings above.
Watch out for
- CBD (cannabidiol) may make warfarin work harder. In published cases of people on warfarin who started the prescription CBD product Epidiolex, one needed the warfarin dose cut by nearly 20% to keep the INR in range, and another reached an INR of 6.86 and needed the weekly dose cut by 30%. The prescription CBD label says CBD is a moderate inhibitor of the liver enzyme CYP2C19 and a weak inhibitor of CYP1A2, and the warfarin label lists both among the enzymes involved in clearing warfarin. The warfarin label also says to check INR more often when starting or stopping botanicals. A 2023 review of case reports of cannabis products with warfarin called the data very low quality, and in those reports the doses were extremely high or not known. A 2022 case report describes a person on warfarin who took about 5 mg of CBD daily (with a little THC) as a medical cannabis product and had little change in INR; its authors say an interaction may depend on the dose and the way the product is taken. Tell the anticoagulation clinic or prescriber before starting, stopping or changing CBD, and expect INR to be checked more often around the change. Do not change the warfarin dose on your own, and watch for unusual bruising, nosebleeds, bleeding gums, or blood in urine or stool.
- Monitor INR levels closely when combining CBD with warfarin; consult healthcare provider for personalized advice.
Frequently asked questions
Can you take CBD and Warfarin together?
CBD and Warfarin: scored 5/10 (medium risk), set when we corrected this page on 4 November 2026 against the drug labels, NIH pages and published studies. The AI-written analysis had scored it 4/10 (high risk). Our interaction rules draw a Moderate warning for this pair; it is below. Not medical advice.
What score does the CBD and Warfarin combination get?
The CBD and Warfarin combination is scored 5/10 (medium risk). We set that score on 4 November 2026 against the drug labels, NIH pages and published studies. The AI-written analysis had scored it 4/10 (high risk). Not medical advice. Always confirm with a healthcare professional.
When should you take CBD and Warfarin?
No timing arrangement makes this combination safe — see the warnings above.
What should you watch out for when combining CBD and Warfarin?
CBD (cannabidiol) may make warfarin work harder. In published cases of people on warfarin who started the prescription CBD product Epidiolex, one needed the warfarin dose cut by nearly 20% to keep the INR in range, and another reached an INR of 6.86 and needed the weekly dose cut by 30%. The prescription CBD label says CBD is a moderate inhibitor of the liver enzyme CYP2C19 and a weak inhibitor of CYP1A2, and the warfarin label lists both among the enzymes involved in clearing warfarin. The warfarin label also says to check INR more often when starting or stopping botanicals. A 2023 review of case reports of cannabis products with warfarin called the data very low quality, and in those reports the doses were extremely high or not known. A 2022 case report describes a person on warfarin who took about 5 mg of CBD daily (with a little THC) as a medical cannabis product and had little change in INR; its authors say an interaction may depend on the dose and the way the product is taken. Tell the anticoagulation clinic or prescriber before starting, stopping or changing CBD, and expect INR to be checked more often around the change. Do not change the warfarin dose on your own, and watch for unusual bruising, nosebleeds, bleeding gums, or blood in urine or stool. Monitor INR levels closely when combining CBD with warfarin; consult healthcare provider for personalized advice.
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Not medical advice
This analysis is based on general supplement information. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult qualified healthcare providers before starting any supplement regimen.
AI-written analysis generated September 2, 2026, checked by our interaction rules · How our analysis works