Iodosorb ointment is a sterile formulation of cadexomer iodine. When applied to the wound, Iodosorb cleans it by absorbing fluids, removing exudate, pus and debris and forming a gel over the wound surface. As the ointment swells, iodine is released, killing bacteria in the wound. The ointment contains 50% cadexomer iodine and 50% ointment base – it also changes colour from brown to yellow when the dressing requires changing.