Pharmaceutisch Weekblad

, Volume 8, Issue 2, pp 139–144 | Cite as

Intra-arterial administration of hexobarbital enantiomers to the rat: disposition and estimation of apparent extraction ratio

  • M. Van der Graaff
  • N. P. E. Vermeulen
  • D. D. Breimer
Original Articles


The enantiomers of hexobarbital, designated asS(+)-HB andR(−)-HB, were administered intra-arterially to rats in a dose of 25 mg· kg−1. Blood pharmacokinetics of the parent compound and two metabolites as well as urinary excretion of three major metabolites were studied. Using previously obtained data following oral administration ofS(+)-HB andR(−)-HB two different methods for calculation of the hepatic extraction ratio (E) were compared. The metabolite profile in the urine after intra-arterial administration was not basically different from corresponding data on oral administration. The clearance of low-dose, intra-arterially administeredS(+)-HB is useful as an indicator of hepatic blood flow in the rat.

Key words

Blood flow, hepatic Clearance Enantiomers Extraction ratio Hexobarbital Metabolism Pharmacokinetics 


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Copyright information

© Bohn, Scheltema & Holkema 1986

Authors and Affiliations

  • M. Van der Graaff
    • 1
  • N. P. E. Vermeulen
    • 1
  • D. D. Breimer
    • 1
  1. 1.Center for Bio-Pharmaceutical Sciences, Division of PharmacologyState University of Leiden Sylvius LaboratoriesRA LeidenThe Netherlands

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