In HIV-HCV co-infected patients, the clinical adverse event profiles reported for Pegasys, alone or in combination with ribavirin, were similar to those observed in HCV mono-infected patients For HIV- HCV patients receiving Pegasys and ribavirin combination therapy other undesirable effects have been reported in ≥ 1% to ≤ 2% of patients: hyperlactacidaemia/ lactic acidosis, influenza, pneumonia, affect lability, apathy, tinnitus, pharyngolaryngeal pain, cheilitis, acquired lipodystrophy and chromaturia.