Arnica is toxic if taken internally except when diluted into homeopathic preparations. Homeopathic treatment is usually individualized to correspond specifically to the patient's symptoms. Typical homeopathic dosing uses either 5C or 30C potency tablets sublingually (under the tongue) three times a day. Doses can be taken for 24 hours or up to six months, although a qualified healthcare practitioner, including a pharmacist, should be consulted before making decisions about dosing.
Other forms of arnica dosing include tinctures taken by mouth, or ointments and fresh plant gel applied on the skin. There is not enough scientific evidence to give specific doses or times for these forms.
Children (younger than 18 years)
There is no proven safe or effective dose of arnica in children.