PAIN RELIEF RIGHT WHERE YOU NEED IT. TheraCare Pain Relief Patches contain 4% lidocaine to desensitize aggravated nerves and help relieve pain fast. Simply apply the stay-put flexible patch right where it hurts. Provides temporary relief from muscle and joint pain associated with arthritis, simple backache, strains, sprains and bruises. No messy creams. No odor. Each patch is 3.9”x5.5”. 10 single-use patches.