Skin rashes, urticaria, eosinophilia, fever. Nausea, vomiting, diarrhea, tooth or tongue discoloration, altered taste, superinfections w/ nonsusceptible bacteria eg,
E. faecium,
P. aeruginosa strains w/ acquired resistance & Candida. Pseudomembranous colitis. Increase liver enzymes, abnormal hematological parameters, +ve Coombs' test. Pain or thrombophlebitis at the inj site.