Pseudomembranous colitis; eosinophilia, agranulocytosis, leucopenia, thrombocytopenia, anaemia, thrombocytopenic purpura, neutropenia, mild SGOT elevation; anaphylactic & allergic reactions; thrombophlebitis (IV); nausea, diarrhoea, vomiting, epigastric discomfort, flatulence, loose stools; hepatic cholestasis; exanthema, urticaria; increased creatinine.