Pains, inflammation, thrombophlebitis at the site of inj; urticaria, rash, pruritus, erythema multiforme, toxic epidermal necrolysis & Stevens-Johnson syndrome; nausea, vomiting, abdominal pain, diarrhoea, pseudomembranous colitis; increased eosinophils, reversible thrombocythaemia, thrombocytopenia, leucopenia, neutropenia, agranulocytosis, +ve direct or indirect Coombs' test, shortened partial thromboplastin; increased transaminases, alkaline phosphatase, lactate dehydrogenase & bilirubin; paraesthesia, headache, seizures; rarely, systemic allergic reaction (hypersensitivity), angioedema & anaphylaxis; oral & vag candidosis.