Skin reactions, changes in Coomb's test result; reversible neutropenia, reduced haemoglobin & haematocrit; prolonged use may cause liver dysfunction; diarrhea, loss appetite, nausea, vomiting; pain (after IM inj) or phlebitis (after IV inj); shock, vomiting, pseudomembranous colitis, haemorrhage, pruritus, SJS.