The pills you have are
Naproxen Tab 500 MG by Watson.
Generic for:
Naprosyn®
Imprint: WATSON 791
Description: white, oblong
Naproxen is in a class of drugs called nonsteroidal anti-inflammatory drugs (NSAIDs). Naproxen works by reducing hormones that cause inflammation and pain in the body.
Naproxen is used to reduce pain, inflammation, and stiffness caused by many conditions, such as osteoarthritis, rheumatoid arthritis, gout, ankylosing spondylitis, injury, abdominal cramps associated with menstruation, tendinitis, and bursitis.
More info at
http://naproxen.drugs.com