Salonpas pain relief patch, medicated plaster is used for the symptomatic relief of pain of muscles and joints associated with strains and sprains. How to use clean and dry the affected area before applying the plaster. Remove the plastic film and apply the adhesive part directly to the skin. Apply 1 plaster to the affected area and leave in place for up to 8 to 12 hours. If pain recurs 8 12 hours after applying the first plaster, a second plaster can be applied. Only use one plaster at a time. Do not use more than 2 plasters per day. Do not use for more than 3 days in a row.the plaster should not be used on open wounds, irritated skin, eyes or mucosa. Do not use this product after the expiry date which is stated on the carton or more than 3 months after first opening the pouch.