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Arnica Side Effects, Interactions and Warnings



  • Arnica may increase the risk of bleeding or potentiate the effects of warfarin therapy.
    - Am J Health Syst Pharm 2000 Jul 1;57(13):1221-7; quiz 1228-30 -- Potential interactions between alternative therapies and warfarin. -- Heck AM, DeWitt BA, Lukes AL.

  • Herbal treatments are becoming increasingly popular, and are often used for internal as well as dermatological conditions, both externally as well as orally. The prevalence of contact sensitization against several plants especially of the Compositae family is quite high in Europe. Sensitization seems to occur relatively frequent with a few species such as arnica, elecampane and tea tree (oil), and occurs rarely with the majority.
    - J Dtsch Dermatol Ges. 2008 Jan;6(1):15-24. Epub 2007 Oct 5. Contact allergy and medicinal herbs. [Article in English, German] Aberer W.








last update: February 2014



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