Shock, hypersensitivity (ie, skin rash, urticaria, erythema, pruritus or fever), granulocytopenia, eosinophilia, thrombocytopenia; increased ALT/AST/alkaline phosphatase; acute kidney insufficiency; pseudomembranous colitis, vomiting, diarrhea, abdominal discomfort, abdominal pain, anorexia, nausea, flatulence, constipation; pulmonary interstitial emphysema (PIE syndrome); stomatitis, candidiasis; vit K or vit B deficiencies; headache, dizziness; may result in false +ve of urine glucose level using Benedict or Fehling soln, or Clinitest; may cause +ve result in Direct Coombs test.