Ibumousse Ibumousse relieves the pain of muscular & joint conditions such as sprains, strains, back-ache, rheumatism & minor arthritic conditions in adults & children over 12 years. It is applied to, & absorbed through, the skin to directly target the affected area. The active ingredient in Ibumousse is ibuprofen, a non-steroidal anti-inflammatory drug (NSAID) that works by relieving pain & reducing swelling & inflammation.