Rash, itching, pemphigus vulgaris, angioedema, dermatitis, urticaria, allergic reaction, anaphylaxis/anaphylactic shock, anaphylactoid reaction, superinfections, adult resp distress syndrome; vomiting, nausea, diarrhea, loose stools, epigastric distress, melena, abdominal pain/cramps; taste disturbances, ototoxicity, dizziness, drowsiness/sedation; kidney function disorder; dyspnea.