Salonpas Diclofenac Patch provides relief of aches, pain and inflammation associated with muscle pain and stiff shoulder, backache, bruises, sprains, strains, joint pain, tendons inflammation. Up to 24 hours. Product Directions: Clean and dry affected area. Remove patch from backing film and apply to skin. Apply 1 patch to the affected area and leave in place for up to 24 hours. Do not use more than 2 patches per day. Product Ingredients: Active ingredient: Diclofenac sodium 15mg (NSAID: non-steroidal anti-inflammatory drug)