Arthrotec 75 is used to reduce pain, swelling, and joint stiffness from arthritis. It contains Diclofenac a known nonsteroidal anti-inflammatory drug (NSAID) and Misoprostol which 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.