Is Arnica Safe with Warfarin?
Free · No account · based on published sources including NIH ODS, FDA drug labels, and peer-reviewed literature
Use Arnica topically only and avoid broken skin if on Warfarin. Do not use oral Arnica products. Inform your doctor of any Arnica use. Report unusual bruising or bleeding changes promptly.
Why this interaction occurs
Arnica contains sesquiterpene lactones with antiplatelet and anti-inflammatory properties. Oral Arnica poses a meaningful interaction risk with Warfarin. Even topical preparations on large areas or broken skin may allow systemic absorption.
Evidence
Evidence level: limited.
Reported safety data
The FDA’s adverse event reporting system (FAERS) has received 134,328 reports mentioning Warfarin. This reflects reported cases involving the medication in general — not confirmed causation, and not specific to the Warfarin + supplement combination on this page.
FAERS reports are voluntary and cannot prove that a drug caused an event. Do not use report counts to assess the safety of this specific drug-supplement pair.
Frequently asked questions
Related interactions
All Arnica interactions → · All Warfarin interactions →
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Educational only — not medical advice.
Always confirm with your doctor or pharmacist.