Jan 28, 2004

The metabolic disposition of aprepitant, a substance P receptor antagonist, in rats and dogs

Drug Metabolism and Disposition : the Biological Fate of Chemicals
Su-Er W HuskeyShuet-Hing L Chiu

Abstract

The absorption, metabolism, and excretion of [14C]aprepitant, a potent and selective human substance P receptor antagonist for the treatment of chemotherapy-induced nausea and vomiting, was evaluated in rats and dogs. Aprepitant was metabolized extensively and no parent drug was detected in the urine of either species. The elimination of drug-related radioactivity, after i.v. or p.o. administration of [14C]aprepitant, was mainly via biliary excretion in rats and by way of both biliary and urinary excretion in dogs. Aprepitant was the major component in the plasma at the early time points (up to 8 h), and plasma metabolite profiles of aprepitant were qualitatively similar in rats and dogs. Several oxidative metabolites of aprepitant, derived from N-dealkylation, oxidation, and opening of the morpholine ring, were detected in the plasma. Glucuronidation represented an important pathway in the metabolism and excretion of aprepitant in rats and dogs. An acid-labile glucuronide of [14C]aprepitant accounted for approximately 18% of the oral dose in rat bile. The instability of this glucuronide, coupled with its presence in bile but absence in feces, suggested the potential for enterohepatic circulation of aprepitant via this conjugat...Continue Reading

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Mentioned in this Paper

Metabolic Process, Cellular
Biochemical Pathway
Urine
In Vivo NMR Spectroscopy
Intravenous Injections
Antagonist Muscle Action
TACR1 gene
Oxidation
Mass Spectrometry
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