Rheumafen is used to treat mild to moderate pain, or to relieve symptoms associated with osteoarthritis or rheumatoid arthritis. Diclofenac is an NSAID (nonsteroidal anti-inflammatory drug).
Rheumafen works by reducing levels of substances that cause pain and inflammation in the body. It is intended to relieve pain and swelling associated with osteoarthritis and rheumatoid arthritis, as well as neck pain.