Diclogesic Retard 100mg is a sustained-release tablet form of Diclofenac Sodium, an NSAID used to treat pain and inflammation. It works by inhibiting the production of certain chemicals in the body (prostaglandins) that cause pain, swelling, and inflammation. The "retard" in the name indicates that the medication is designed to release the active ingredient gradually over time, providing longer-lasting relief from symptoms.