Sold by weight. Arnica (Arnica montana), flower, whole, Mexico. Oral administration of arnica is often accompanied by severe side effects!! For external use in injury and for consequences of accidents, e.g., hematoma, dislocations, contusions, edema due to fracture, rheumatic muscle and joint problems. Especially when applied topically, arnica preparations have antiphlogistic activity. In cases of inflammation, arnica preparations also show analgesic and antiseptic activity. One of the best ways to use Arnica is to make an oil infusion and then apply it to the affected area. Should not to be applied to broken skin.