Hisamitsu Pharmaceuticals is a pharmaceutical company that develops prescription and over-the-counter drug (OTC) products. Hisamitsu has specialized in transdermal drug delivery system technology (TDDS) since the introduction of its original line of patches in 1903. The company offers Salonpas pain relief products in the form of patches, sprays, gels, creams, liniments, and lotions. Founded in 1847, it is headquartered in Tosu, Japan.