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Xenobiotica. 1990 Oct;20(10):1025-34.

Identification of two major biliary metabolites of carvedilol in rats.

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Drug Metabolism and Analytical Chemistry Research Center, Daiichi Pharmaceutical Co., Ltd., Tokyo, Japan.


1. After separate administration of R(+)-carvedilol, S(-)-carvedilol and (+/-)-14C-carvedilol to rats at an oral dose of 10 mg/kg, the metabolic pattern in the bile was studied using h.p.l.c. with radioactivity and u.v. monitoring. 2. Two major metabolites, M-1 and M-2, present in the bile, accounted for 39% and 22% dose, respectively. 3. M-1 and M-2 were characterized as 1-hydroxycarvedilol O-glucuronide and 8-hydroxycarvedilol O-glucuronide, respectively, from FAB-mass spectrometry, 1H-n.m.r. and enzymic hydrolysis. 4. Oral administration of R(+)-carvedilol led to highly selective excretion of M-1 in bile whereas S(-)-carvedilol resulted predominantly in excretion of M-2 rather than M-1.

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