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Abstract

Formation and disposition of the minor metabolites of acetaminophen in the hamster.

M W Gemborys and G H Mudge
Drug Metabolism and Disposition July 1981, 9 (4) 340-351;
M W Gemborys
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G H Mudge
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Abstract

The urinary metabolites of acetaminophen and N-hydroxyacetaminophen were studied in the hamster over a wide dose range and with pretreatments designed to modify drug metabolism. Attention was focused on the origin and disposition of the minor metabolites. The sum of the 3-thio adducts, rather than just the 3-mercapturic adduct, is considered the better index of the formation of the reactive immediate precursor, presumably N-acetyl-p-benzoquinoneimine. At low dosage this amounts to 33% of the administered dose in this species. There is a major contribution from the 3-methylthio adduct, the magnitude of which has not been previously recognized. The 3-methylthio and the 3-methylsulfoxide derivates of acetaminophen are secondarily derived from the 3-glutathione adduct within the enterohepatic circulation, as indicated by their late appearance in the urine, the effect of common bile duct ligation and the metabolism of the minor metabolites when they themselves are administered. Following the administration of N-hydroxyacetaminophen this was excreted in the urine along with its phenolic conjugates, but no urinary N-hydroxyacetaminophen was detectable after the administration of acetaminophen itself. Of particular interest to the pathogenesis of analgesic nephropathy was the detection in the urine of small amounts of p-aminophenol, a known nephrotoxic agent, following dosage with acetaminophen. This metabolite has not been previously detected.

 

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Drug Metabolism and Disposition
Vol. 9, Issue 4
1 Jul 1981
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Abstract

Formation and disposition of the minor metabolites of acetaminophen in the hamster.

M W Gemborys and G H Mudge
Drug Metabolism and Disposition July 1, 1981, 9 (4) 340-351;

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Abstract

Formation and disposition of the minor metabolites of acetaminophen in the hamster.

M W Gemborys and G H Mudge
Drug Metabolism and Disposition July 1, 1981, 9 (4) 340-351;
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