Diclofenac is used to reduce pain, swelling, and joint stiffness from arthritis. Diclofenac is known as a nonsteroidal anti-inflammatory drug (NSAID). Misoprostol protects the stomach from diclofenac's irritating effects. This combination medication is used to treat arthritis in people at high risk of getting stomach/intestinal ulcers and complications from the ulcers (such as bleeding). 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.