Diclofenac + Famotidine is a combination of two medicines: Diclofenac and Famotidine which relieve abdominal pain. Diclofenac is a non-steroidal anti-inflammatory drug (NSAID). It works by preventing the formation of chemicals responsible for fever, pain, and inflammation (redness and swelling). Famotidine is an H2 blocker (type of antacid). It works by reducing the amount of acid in the stomach which helps to get relief of acid-related indigestion and heartburn.