Abdominal pain or cramps, nausea, vomiting, diarrhea & loose stools. Antibiotic-associated pseudomembranous colitis. Skin rashes & urticaria, SJS, anaphylaxis, transient leucopenia, leucopenia w/ agranulocytosis, eosinophilia, thrombocytopenia, erythema multiforme, exfoliative & vesiculobullous dermatitis, polyarthritis, abnormal LFT, overt jaundice, hepatic damage.