What is diclofenac sodium 75mg tablets? Posted on August 16, 2022 By admin_zxviwxhy DICLOFENAC (dye KLOE fen ak) is a non-steroidal anti-inflammatory drug (NSAID). It is used to reduce swelling and to treat pain. It may be used to treat osteoarthritis, rheumatoid arthritis, and ankylosing spondylitis.