Equate Naproxen Sodium All Day Back and Muscle Pain Relief Tablets go to work quickly to give you the relief that you need. Our pain relief tablets are formulated with naproxen sodium, a nonsteroidal anti-inflammatory drug (NSAID), that stays effective in managing pain for up to 12 hours. These anti-inflammatory tablets also help to relieve the discomfort associated with the common cold, toothache, headache, menstrual cramps, and more. Give yourself the relief you deserve with Equate Naproxen Sodium All Day Back and Muscle Pain Relief Tablets. Making the right health decisions can be challenging. With a complete range of products and simple solutions, Equate allows you to take care of your family with confidence.