List of products in the National Drug Code with proprietary name . Tolmetin is used alone or with other treatments to reduce pain, swelling, and joint stiffness from rheumatoid arthritis and osteoarthritis. It is also used for juvenile rheumatoid arthritis. If you are treating a chronic condition such as arthritis, ask your doctor about non-drug treatments and/or using other medications to treat your pain. See also Warning section. Tolmetin is known as a nonsteroidal anti-inflammatory drug (NSAID).