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Abstract

The metabolism and disposition of fenofibrate in rat, guinea pig, and dog.

A Weil, J Caldwell and M Strolin-Benedetti
Drug Metabolism and Disposition March 1988, 16 (2) 302-309;
A Weil
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J Caldwell
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M Strolin-Benedetti
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Abstract

The metabolism and disposition of orally administered single doses of [14C]fenofibrate (isopropyl 2-[4-(4-chlorobenzoyl)phenoxy]-2- methylpropionate) have been studied in rat, guinea pig, and dog. In rats, the urinary excretion of 14C in 5 days varied from 11 to 51% of the dose and was markedly dependent upon the dose form given. The interpretation of these data in terms of factors affecting the absorption of fenofibrate from the gut is complicated by the enterohepatic recirculation of metabolites. The tissue distribution of 14C after oral administration of an ethanolic solution of fenofibrate has been studied in the rat. The only tissues in which the concentration of 14C exceeded that in the blood were the organs of absorption and elimination, the gut, liver, and kidneys. Guinea pigs excreted 53% of the dose in the urine in 5 days, with a further 34% in the feces, while in dogs the corresponding figures were 9% and 81%, respectively. In all three species, all the urinary metabolites were products of ester hydrolysis, and the principal excretion product was "reduced fenofibric acid" which arose by subsequent carbonyl reduction. Glucuronidation of fenofibric acid and "reduced fenofibric acid" was a very minor reaction in the rat and guinea pig and was not detected in the dog. In addition, polar unknown metabolite(s) were detected in all three species, but were not investigated further. The results are discussed in terms of the comparative disposition of fenofibrate and other hypolipidemic agents and the contribution of these findings to the safety assessment of such drugs.

 

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Drug Metabolism and Disposition
Vol. 16, Issue 2
1 Mar 1988
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Abstract

The metabolism and disposition of fenofibrate in rat, guinea pig, and dog.

A Weil, J Caldwell and M Strolin-Benedetti
Drug Metabolism and Disposition March 1, 1988, 16 (2) 302-309;

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Abstract

The metabolism and disposition of fenofibrate in rat, guinea pig, and dog.

A Weil, J Caldwell and M Strolin-Benedetti
Drug Metabolism and Disposition March 1, 1988, 16 (2) 302-309;
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