Arnica Montana 30C is a homeopathic remedy that is used for pain relief, stiffness, and swelling caused by injuries. It is available in the form of oral pellets that are dissolved under the tongue. Arnica Montana 30C is also available in a topical form that can be used in combination with the oral pellets for combined pain relief. Arnica Montana 30C is used for a wide range of conditions, including bruises, sprains, muscle aches, wound healing, superficial phlebitis, joint pain, inflammation from insect bites, and swelling from broken bones. However, there is no good scientific evidence to support these uses. Arnica Montana 30C should not be taken by mouth without direct medical supervision, except in an extremely diluted form as a homeopathic remedy, because side effects can occur. If you have any questions about whether you have the herbal or homeopathic form of Arnica Montana 30C, talk to your doctor.