Do not take arnica internally unless it is under the supervision of your doctor, it is poisonous and not for self-medication, as the plant may be toxic and cause skin irritations.

Internal consumption can cause vomiting, weakness, high blood pressure, increased heart rate and nervous disturbances.

Never apply arnica on broken skin. If further irritation develops, discontinue use.

 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. Learn more about Arnica.

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