Diarrhea/loose stools, nausea & vomiting; maculopapular rash, urticaria; reversible neutropenia, decreased Hb or hematocrit, transient eosinophilia, thrombocytopenia, hypoprothrombinemia; headache, fever, inj pain, chills; transient SGOT, SGPT, alkaline phosphatase & bilirubin elevations. Anaphylactoid reaction (eg, shock); hypotension; Pseudomembranous colitis; leucopenia; pruritus, SJS; hematuria; vasculitis.