<prompt> Sterile haemorrhagic cystitis is caused by ?BusulfanKetoprofenMethicillinCylclophosphamide  <response>: Ans. is d i.e., Cyclophosphamide Haemorrhagic cystitis can develop in patients receiving cyclophosphamide or ifosfamide. o Hemorrhagic cystitis due to cyclophosphamide is attributed to the presence of its metabolite ACROLEIN in urine. Other drugs causing hemorrhagic cystitis Carmustine o Extended spectrum penicillins o Vincristine Chlorambucil o Nitrogen mustard o Busulfan 