Arnica is a medicinal herb used for hundreds of years in Native American and European folk medicine. It is most often used topically to treat skin conditions such as acne or boils, as well as muscle aches and wounds. No solid scientific evidence supports arnica as effective in treating these conditions. Before considering using this herb, talk to your doctor. Topical use of arnica may cause side effects.
External Use
Because it is not safe to ingest, never use arnica ointments or salves on an open wound or broken skin, where it might be absorbed into the body. Arnica should be used in small, single doses as repeated use or products with high concentrations of arnica may increase the risk of problems, according to the American Cancer Society. Potential side effects include skin irritation, peeling, itching, blisters and skin ulcers. Arnica may cause eczema, or dermatitis, which is swollen skin that may also be red and itchy.
Internal Use
Arnica is rarely taken orally because it can cause dangerous side effects and large doses can be fatal, according to the University of Maryland Medical Center. Internal use of arnica can cause dizziness, tremors, rapid or irregular heartbeat, vomiting, diarrhea, internal bleeding, muscle weakness, nervousness, nosebleeds, coma and irritation of the mucus membranes.
Some alternative practitioners, known as homeopaths, do use arnica in extremely diluted form in remedies for sore muscles, bruises or other conditions. These remedies may be so dilute that there's no detectable amount of arnica present. Still, to be safe, never take arnica internally unless you have consulted your doctor and you are closely monitored.
Precautions
Avoid arnica if you are pregnant or nursing, as its effects are not fully understood. Some people are allergic to arnica and may suffer serious allergic reactions that can cause runny nose, itching, hives, shortness of breath and even shock, which can be fatal. If you are allergic to sunflowers, Echinacea, marigolds, chamomile, ragweed, or other members of the plant family Asteraceae, you are at higher risk of an allergic reaction.
Interactions
Arnica may block the effectiveness of high blood pressure medication. It may also increase the risk of serious bleeding problems in people who are taking blood thinners like warfarin. If you are taking heart medications, you are at a higher risk for serious side effects from arnica. Do not take arnica until you talk to your doctor or pharmacist if you are taking any of these medications.
Member Comments