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Related Experiment Videos

Dexamethasone bovine pharmacokinetics.

P Gaignage1, G Lognay, D Bosson

  • 1Department of General and Organic Chemistry, Faculty of Agricultural Sciences, Gembloux, Belgium.

European Journal of Drug Metabolism and Pharmacokinetics
|July 1, 1991
PubMed
Summary
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Dexamethasone phosphate (DXM-PHO) rapidly converts to dexamethasone (DXM) in cattle, with a plasma half-life of 5.16 hours. Detectable DXM levels were below 0.1 mg/ml after 54 hours, indicating rapid clearance.

Area of Science:

  • Veterinary Pharmacology
  • Pharmacokinetics in Livestock
  • Drug Metabolism Studies

Background:

  • Dexamethasone phosphate (DXM-PHO) is a widely used corticosteroid in veterinary medicine.
  • Understanding its pharmacokinetic profile in cattle is crucial for determining withdrawal times and ensuring food safety.
  • Limited data exists on the specific metabolism and elimination of DXM-PHO in young bulls.

Purpose of the Study:

  • To investigate the hydrolysis of dexamethasone phosphate (DXM-PHO) to dexamethasone (DXM) in bovine plasma.
  • To determine the plasma half-life and elimination kinetics of DXM following DXM-PHO administration.
  • To track the distribution and excretion of dexamethasone metabolites in young bulls.

Main Methods:

  • In vitro hydrolysis of DXM-PHO in bovine plasma.

Related Experiment Videos

  • Intravenous administration of DXM-PHO to a young bull.
  • Plasma sampling over time to measure DXM concentrations using validated analytical methods.
  • Administration of tritiated dexamethasone to track radioactivity and identify metabolites.

    • Main Results:

    • DXM-PHO was rapidly hydrolyzed to DXM in bovine plasma.
    • The plasma half-life of DXM was determined to be 5.16 hours.
    • DXM concentrations fell below 0.1 mg/ml by 54 hours post-injection.
    • The plasma recovery half-time for radioactivity after tritiated dexamethasone administration was 8.8 hours.
    • Urinary recovery of radioactivity was 36.4% and 22.6% for the first and second injections, respectively.

    Conclusions:

    • Dexamethasone phosphate is efficiently converted to dexamethasone in cattle.
    • Dexamethasone exhibits a relatively short plasma half-life in young bulls, suggesting rapid elimination.
    • Urinary excretion is a significant route for the elimination of dexamethasone and its metabolites in cattle.