Salonpas Pain Relief Patch features a Transdermal Drug Delivery System (TDDS), whereby an anti-inflammatory medicine is spread across an ultra-thin and highly stretchable piece of cloth, that when applied directly to the skin enables the anti-inflammatory medicine to be delivered directly to the site of pain. The thinness and flexibility of Salonpas Pain Relief Patch makes them extremely discreet and allows them to stick firmly to any shape of the body, even over joints. Salonpas Pain Relief Patch can be worn for up to 12 hours, day and night, and provides long-lasting relief. Active ingredients: Methyl salicylate and menthol.