List of products in the National Drug Code with proprietary name . Ketoprofen is used to relieve pain from various conditions. It also reduces pain, swelling, and joint stiffness from arthritis. This medication is a nonsteroidal anti-inflammatory drug (NSAID). It works by blocking your body's production of certain natural substances that cause inflammation. This effect helps to decrease swelling, pain, or fever. If you are treating a chronic condition such as arthritis, ask your doctor about non-drug treatments and/or using other medications to treat your pain. See also Warning section.