Skin rash, pruritus, urticaria, nausea, vomiting, indigestion, diarrhoea; rarely, angioneurotic oedema; anaphylaxis, interstitial nephritis, crystalluria, mucocutaneous candidiasis, pseudomembranous & haemorrhagic colitis, moderate rise in AST & ALT, reversible leucopenia & thrombocytopenia, haemolytic anaemia.