Naproxen sodium is a nonsteroidal anti-inflammatory drug (NSAID) commonly used for the reduction of pain, fever, inflammation and stiffness caused by conditions such as: osteoarthritis kidney stones rheumatoid arthritis psoriatic arthritis gout ankylosing spondylitis menstrual cramps tendinitis bursitis It is also used for the treatment of primary dysmenorrhea. It works by inhibiting both the COX-1 and COX-2 enzymes. Naproxen and naproxen sodium are marketed under various trade names, including: Aleve, Anaprox, Antalgin, Feminax Ultra, Flanax, Inza, Midol Extended Relief,Nalgesin, Naposin, Naprelan, Naprogesic, Naprosyn, Narocin, Proxen, Synflex and Xenobid...