Other Information: Each tablet contains: sodium 20 mg. Store at 20-25 degrees C (68-77 degrees F). Avoid high humidity and excessive heat above 40 degrees C (104 degrees F). Misc: Naproxen sodium tablets (NSAID). Pain reliever/fever reducer. For temporary relief of minor back and muscle aches and pains. Strength to last 12 hours. All day strong. Questions or comments? 1-800-395-0689 (Mon-Fri 9 am - 5 pm EST).