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  • Title: Enantioselective glucuronidation and subsequent biliary excretion of carprofen in horses.
    Author: Soraci A, Benoit E, Jaussaud P, Lees P, Delatour P.
    Journal: Am J Vet Res; 1995 Mar; 56(3):358-61. PubMed ID: 7771704.
    Abstract:
    Carprofen (CPF) enantiomers and their glucuronide conjugates (GLUC) were measured in plasma and bile of horses after IV administration of the racemic compound (0.7 mg/kg of body weight). The CPF was detectable in plasma for up to 72 hours after dosing, whereas GLUC appeared early (time for maximal plasma concentration, 1 hour) and was measurable transiently at low concentration (maximal plasma concentration, 0.5 microgram/ml). The enantiospecific plasma profiles indicated a clear predominance of R-CPF, whereas the stereoselectivity of the glucuronides favored S-GLUC. At 1, 2, and 12 hours after administration of the drug, bile concentrations of GLUC were high compared with those in plasma and enantioselectivity favored S-GLUC. These data indicate that the higher body clearance observed for S-CPF is a consequence of the enantioselectivity in liver glucuronidation and subsequent biliary excretion of the S enantiomer of the drug.
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