Aceclofenac 100 MG Tablet is a painkiller. It provides relief from pain, stiffness, and swelling due to various conditions related to your bone and joints. It is also used to provide relief from headaches, toothaches, backaches, menstrual pain, sprains, and strains. Aceclofenac 100 MG Tablet works by preventing the release of a chemical substance that causes pain and swelling in your body.