A molecular model of naproxen, a nonsteroidal anti-inflammatory drug (NSAID) usually sold as naproxen sodium, prescribed to relieve pain, fever, swelling, and stiffness. Naproxen is often used to treat migraines, osteoarthritis, kidney stones, rheumatoid arthritis, psoriatic arthritis, gout, ankylosing spondylitis, tendinitis, and bursitis. Atoms are colored dark gray (carbon), light gray (hydrogen), and red (oxygen).