Studies on disposition and metabolism of tolmetin, a new anti-inflammatory agent, in rats and mice. II. Urinary metabolites

Hashimoto, M.; Miyazaki, H.; Nambu, K.; Fujii, T.; Arakawa, S.; Yoshida, K.; Utsui, Y.

Drug Metabolism and Disposition the Biological Fate of Chemicals 7(1): 20-23

1979


ISSN/ISBN: 0090-9556
PMID: 35321
Document Number: 146129
A new urinary metabolite of tolmetin was found in rat urine and identified as the hydroxymethyl metabolite (tolmetin-OH), an intermediate in the formation of the known carboxy metabolite (tolmetin-COOH). In rats of two strains, the following percentages of the urinary reactivity of [14Ia1tolmetin were found in 24 hr: unchanged tolmetin-COOH (58--60%), tolmetin-OH (18--24 %), and its conjugate 6--14%. Mouse urine contained the unchanged drug (about 20%), its conjugate and tolmetin-COOH (60%). Similarly to mouse urine, human urine contained negligible amounts of tolmetin-OH.

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