Salonpas Pain Relief Patch is clinically proven to provide temporary relief of mild to moderate muscle pain including sore muscles, sprains, backache and joint ache.. Salonpas Pain Relief Patch is the first and only FDA-Approved OTC topical pain patch for the temporary relief of mild to moderate muscles and joints aches and pains associated with arthritis, sprains, strains, bruises and simple backache. Salonpas Pain Relief Patch pr s effective pain relief for up to 12 hours. Salonpas Pain Relief Patch contains two powerful pain fighting ingredients, menthol and yl salicylate (a NSAID a nonsteroidal anti-inflammatory drug).