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Relationship between in vivo and in vitro drug metabolism in man

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Summary

Relationship between in vivo and in vitro drug metabolism was investigated in 200 consecutive patients with diagnostic liver needle biopsy by comparing the cytochrome P-450 (P-450) content in biopsies with the elimination kinetics of antipyrine. P-450 level in livers varied from 0.5 to 32.5 nmole/g, it was increased in subjects treated with enzyme inducing drugs and reduced in patients with degenerative parenchymal changes in the liver. Antipyrine metabolism also varied markledy, the half-life ranged from 2.2 to 54.4 hrs and the clearance from 3.5 to 142.4 ml/min. Rapid drug metabolism was associated with subjects with normal liver or with slight liver changes in case they were also treated with known inducers whereas reduced antipyrine metabolism was seen in subjects with degenerative liver changes. P-450 content in biopsies was related to the kinetic parameters of antipyrine: correlation between P-450 in livers and the drug clearance was linear whereas a non-linear relationship between P-450 and plasma half-life was obtained. The results demonstrate a relationship between in vivo and in vitro parameters of drug metabolism in man and show the importance of liver parenchymal changes and drug therapy as factors influencing hepatic drug metabolism.

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Sotaniemi, E.A., Pelkonen, R.O., Ahokas, J.T. et al. Relationship between in vivo and in vitro drug metabolism in man. European Journal of Drug Metabolism and Pharmacokinetics 3, 39–45 (1978). https://doi.org/10.1007/BF03189367

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