Reaksi kulit, perubahan pd hasil tes Coomb, neutropenia reversibel, penurunan kadar Hb & hematokrit, gagal hati, diare, kehilangan nafsu makan, mual & muntah, nyeri pd tempat inj (IM), flebitis (IV), syok anafilaksis, kolitis pseudomembran, perdarahan, pruritus, sindrom Stevens-Johnson.