Arnica Montana is a homeopathic remedy indicated for muscular soreness due to overexertion, and facilitates the healing of swelling, bruising, shock, sprains, soreness, injury, and post surgery. For the temporary relief of minor muscle or joint aches and Discomfort; strains, sprains, bruises, backache or over-exertion. Characteristics Discomfort, stiffness or swelling may be associated with acute injuries or trauma.