Proxidol DS 550 mg is a prescription medication containing Naproxen Sodium, a nonsteroidal anti-inflammatory drug (NSAID). It comes in tablet form and is used to relieve pain, inflammation, and fever. Each pack contains 10 tablets. The active ingredient Naproxen Sodium works by reducing hormones that cause inflammation and pain in the body. This medication requires a prescription and should be kept out of reach of children. It should be taken as directed by your healthcare provider. Common uses include relief of pain from arthritis, menstrual cramps, headaches, muscle aches, and other conditions involving pain and inflammation.