Very rarely, wheals (localised swelling of the skin), a symmetrical red raised rash usually on the limbs (erythema multiforme), skin peeling and fever (toxic epidermal necrolysis) or a widespread blistering rash causing ulcers of the skin, mouth and genital area and fever (Stevens-Johnson syndrome) may occur. • Liver and renal disorders - increase of bilirubin (jaundice) and liver enzymes such as alkaline phosphatase and AST (SGOT), and painful urination (dysuria).