Diarrhea/loose stools, nausea, vomiting; maculopapular rash, urticaria; slight decreases in neutrophils, reversible neutropenia (prolonged use), +ve direct Coombs' test, decreased Hb or hematocrit, transient eosinophilia, thrombocytopenia, hypoprothrombinemia; headache, fever, inj pain & chills; transient elevation of liver function tests, SGOT, SGPT, alkaline phosphatase & bilirubin levels; transient pain; anaphylactoid reactions (including shock); hypotension; pseudomembranous colitis; pruritus, Stevens-Johnson syndrome; leucopenia; hematuria.