Topical analgesic and anti-inflammatory for backache, rheumatic and muscular pain, sprains and sports injuries. Radian B is a gel, which is applied to the skin, containing the active ingredient ibuprofen. Ibuprofen is one of a group of medicines called non- steroidal anti- inflammatory drugs (NSAIDs). NSAIDs relieve pain and reduce inflammation. Radian B is used to help relieve backache, rheumatic and muscular pain, or sprains and sports injuries.