Aceclofenac is a non-steroidal anti-inflammatory drug (NSAID) used to relieve pain and inflammation in conditions such as osteoarthritis, rheumatoid arthritis, and ankylosing spondylitis. It works by blocking the action of cyclooxygenase (COX) enzymes, which are involved in the production of prostaglandins—chemicals that cause pain, swelling, and inflammation. Aceclofenac is typically available in tablet form and is taken orally.