--Nausea, diarrhea, hypersensitivity reactions, rash, urticaria, angioedema, serum sickness-like reactions, hemorrhagic colitis, pseudomembranous colitis, interstitial nephritis, reversible hyperactivity, convulsions, anxiety, insomnia, confusion, behavioral changes, dizziness, tooth discoloration, stomatitis, glossitis, enterocolitis, gastritis, black hairy tongue, hepatitis, cholestatic jaundice, anemia, thrombocytopenic purpura, eosinophilia, leukopenia, agranulocytosis, superinfections.