Pfizer ThermaCare self-heating patch, a medical device that effectively relieves minor muscle and joint pain associated with muscle tension, stiffness or osteoarthritis. Relieves chronic or occasional pain. The patch's patented pockets contain thermoactive components that react with air. Once the patch is applied to the skin over the painful area, the heat relaxes the muscles and effectively relieves areas of painful tension.
In contact with oxygen in the air, the alveoli produce constant heat for 8 hours. The application of heat relaxes the muscles and effectively relieves painful tension areas.