| Since vancomycin is not usually significantly absorbed from the gastro-intestinal tract, the toxicity encountered with parenteral therapy is unlikely to occur after oral administration (but see 'Precautions').Nephrotoxicity: Rarely, renal failure, principally manifested by increased serum creatinine or blood urea concentrations, have been observed, especially in patients given large doses of intravenously administered vancomycin. Rare cases of interstitial nephritis have been reported. Most occurred in patients who were given aminoglycosides concomitantly or who had pre-existing kidney dysfunction. When vancomycin was discontinued, azotaemia resolved in most patients.Ototoxicity: Hearing loss associated with intravenously administered vancomycin has been reported. Most of these patients had kidney dysfunction, pre-existing hearing loss, or concomitant treatment with an ototoxic drug. Vertigo, dizziness and tinnitus have been reported rarely.Haematological: Reversible neutropenia, usually starting one week or more after onset of intravenous therapy or after a total dose of more than 25g, Neutropenia appears to be promptly reversible when vancomycin is discontinued. Thrombocytopenia and reversible agranulocytosis (granulocyte count less than 5oo/mm3) have been reported rarely. Eosinophilia has been reported rarely.Miscellaneous: Hypersensitivity reactions, anaphylaxis, chills, drug fever, hypotension, wheezing, dyspnoea, urticaria, pruritus, flushing of the upper body ('red neck syndrome'), pain, muscle spasm of the chest and back, nausea and rashes, including exfoliative dermatitis, Stevens-Johnson syndrome, toxic epidermal necrolysis and rare cases of vasculitis. | |