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, kandidiasis; vitamin K or vitamin B deficiencies; headache, dizziness; may result in false positive of urine glucose level using Benedict or Fehling solution, or Clinitest; may cause positive result in Direct Coombs test.