A: Voltaren, Cataflam (diclofenac) (http:///www.everydayhealth.com/drugs/diclofenac) is a non-steroidal anti-inflammatory drug (NSAID) that works on substances in the brain that normally cause pain and inflammation.Diclofenac can be used for headaches, toothaches, and joint pain associated with arthritis.iclofenac is normally taken to relieve pain, swelling, or inflammation caused by injuries and conditions such as osteoarthritis, rheumatoid arthritis, painful menstruation periods, migraines, and ankylosing splondylitis. Diclofenac belongs to group of drugs known as non-steroidal anti-inflammatory drugs (NSAIDs).