Medrull Hotplaster Pain Relief Patch provides effective pain relief from lumbar pain, stiff neck, muscle tension, joint pain, rheumatic pain and menstrual pain. It contains active organic ingredients of arnica, devil's claw, willow bark, vanillyl butyl ether. These ingredients guarantees the action of the patches for 24 hours whilest the druationof the heating effet tends to be exhausted after a few hours.