Naproxen is a nonsteroidal anti-inflammatory drug (NSAID). It is used to relieve symptoms like inflammation, swelling, stiffness, and joint pain caused by several kinds of arthritis like osteoarthritis, rheumatoid arthritis, or juvenile arthritis. It also helps to relieve symptoms of more rare types of arthritis like ankylosing spondylitis, which affects the spine and joints. Nevertheless of it's value to cure symptoms it does not cure arthritis and will reduce the symptoms only as long as you continue to take it.
The following side effects are ordered by descending occurrence.