European Journal of Clinical Pharmacology

, Volume 31, Issue 5, pp 613–615 | Cite as

Pharmacogenetic differences in the inhibitory effect of cimetidine on the metabolism of antipyrine

  • B. Gachályi
  • Á. Vas
  • K. Csillag
  • B. Nagy
  • F. Kocsis
  • A. Káldor
Short Communications


The relationship between acetylator phenotype and the inhibitory effect of cimetidine on the hepatic metabolism of antipyrine has been studied in 20 subjects. Cimetidine, 1,0 g/day resulted in a significant decrease in the metabolic clearance rate of antipyrine, but only in slow acetylators, as fast acetylators were less affected. No sex difference was observed. No major change occurred in the urinary excretion of D-glucaric acid, which means that cimetidine had not-affected that Phase II reaction. It did significantly decrease the urinary partial clearance rate of norantipyrine, leaving that of antipyrine and 4-OH-antipyrine unchanged, which suggests that cimetidine had preferentially inhibited the P 450 isozyme that catalyses norantipyrine formation.

Key words

cimetidine antipyrine acetylator phenotypes microsomal inhibition 


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Copyright information

© Springer-Verlag 1987

Authors and Affiliations

  • B. Gachályi
    • 1
  • Á. Vas
    • 1
  • K. Csillag
    • 1
  • B. Nagy
    • 2
  • F. Kocsis
    • 2
  • A. Káldor
    • 1
  1. 1.Department of MedicinePostgraduate Medical SchoolBudapestHungary
  2. 2.Visegrád Hospital of the City Council of BudapestBudapestHungary

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