Furosemide increases plasma oxypurinol without lowering serum urate—a complex drug interaction: implications for clinical practice
Rheumatology,  Clinical Article

Stamp LK et al. – The interaction between allopurinol and furosemide results in increased serum urate (SU) and plasma oxypurinol. The exact mechanisms remain unclear but complex interactions that result in attenuation of the hypouricaemic effects of oxypurinol are likely.

Methods
  • Twenty–three cases with gout receiving furosemide and allopurinol were recruited.
  • Twenty–three controls with gout receiving allopurinol but no diuretics were matched on age, gender, estimated glomerular filtration rate and allopurinol dose.
  • SU, plasma oxypurinol and urinary urate were assessed on a single occasion.
  • The effects of a single dose of furosemide 40 mg were examined in a separate group of 10 patients receiving allopurinol but not diuretic.

Results
  • Cases had significantly higher SU and plasma oxypurinol compared with controls despite receiving similar doses of allopurinol.
  • There was no difference in urinary urate excretion.
  • There was a significant increase in area under the curve (AUC)0–24 for oxypurinol after administration of furosemide 40 mg.

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