Erythema, local pain, thrombophlebitis, rash, pruritus, urticaria, TEN, fever, anaphylactic reactions, nausea, vomiting, diarrhea, pseudomembranous colitis, eosinophilia, leucopenia, neutropenia, agranulocytosis, thrombocytopenia, thrombocytosis, reduced Hb, hepatitis (rare). Direct +ve result in Coombs' test. Oliguria/anuria, polyuria, acute kidney failure (rare), myoclonic activity, psychic disturbance, confusion, convulsion, taste disturbance.