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Drug Metabolism & Disposition

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Abstract

Plasma concentration-response relationship for cimetidine inhibition of drug metabolism in the rat.

A Adedoyin, L Aarons and J B Houston
Drug Metabolism and Disposition January 1987, 15 (1) 127-132;
A Adedoyin
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L Aarons
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J B Houston
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Abstract

Cimetidine inhibition of antipyrine elimination has been studied in the rat over a range of steady state cimetidine concentrations. Cimetidine is a potent inhibitor of antipyrine metabolism with a concentration of about 1.25 mg/liter causing a 50% decrease in the total plasma clearance of antipyrine. The degree of inhibition of antipyrine clearance caused by cimetidine is dependent upon its plasma concentration, but the relationship is not linear. The formation clearances of all antipyrine metabolites measured--3-hydroxymethylantipyrine, 4-hydroxyantipyrine, and norantipyrine--are inhibited by cimetidine at all concentrations used. The susceptibility of the different metabolites to cimetidine inhibition does vary. The renal clearance of antipyrine was also decreased by cimetidine by an unknown mechanism. Analysis of the individual formation clearances suggests that the inhibition of oxidative metabolism due to cimetidine is caused by its binding to two classes of enzyme sites--a high affinity, low capacity and a low affinity, high capacity site. These two different sites would appear to be responsible for the production of different metabolites of antipyrine. The true nature of the selectivity of cimetidine inhibition of antipyrine metabolism is apparent from the formation clearances but not from the urinary metabolite patterns.

 

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Drug Metabolism and Disposition
Vol. 15, Issue 1
1 Jan 1987
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Abstract

Plasma concentration-response relationship for cimetidine inhibition of drug metabolism in the rat.

A Adedoyin, L Aarons and J B Houston
Drug Metabolism and Disposition January 1, 1987, 15 (1) 127-132;

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Abstract

Plasma concentration-response relationship for cimetidine inhibition of drug metabolism in the rat.

A Adedoyin, L Aarons and J B Houston
Drug Metabolism and Disposition January 1, 1987, 15 (1) 127-132;
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