Salonpas 12 Hour Pain Relief Patch is the first and only 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 12 Hour Pain Relief Patch provides effective pain relief for up to 12 hours. Salonpas 12 Hour Pain Relief Patch contains two powerful pain fighting ingredients: menthol and methyl salicylate.