Diclofenac sodium, the active ingredient in Diclofenac Tablets, is one of a group of medicines called non-steroidal anti-inflammatory drugs (NSAIDs). NSAIDs reduce pain and inflammation. Diclofenac Tablets relieve pain, reduce swelling and ease in flammation in a wide range of conditions such as Rheumatoid arthritis, osteoarthritis, acute gout, ankylosing spondylitis. - Backache, sprains and strains, soft tissue sports injuries, frozen shoulder, dislocations and fractures.