Pharmacokinetics and Clinical Utility of Sodium Bromide (NaBr) as an Estimator of Extracellular Fluid Volume in Horses

C. Langdon Fielding, K. Gary Magdesian, Denise A. Elliott, Arthur L. Craigmill, W. David Wilson, Gary P. Carlson

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


The purpose of this study was to describe the pharmacokinetics of bromide in horses and to evaluate the corrected bromide space as an indicator of extracellular fluid volume (ECFV) in horses after the administration of a single dose of bromide by intravenous infusion. Sodium bromide (30 mg/kg of body weight, IV) was administered to 6 clinically healthy mares over a period of 3 minutes. Blood samples were collected before infusion and at intervals between 0.5 hours and 53 days after infusion. Mean elimination half-life (harmonic mean) was 126 hours (5.2 days), clearance was 1.4 ± 0.09 mL/kg·h, area under the curve was 17,520 ± 1,100 μg·h/mL, and volume of distribution (steady state) was 0.255 ± 0.015 L/kg. The mean corrected bromide space was determined from the volume of distribution (steady state) and the serum concentrations of bromide at equilibration. Corrected bromide space, an estimate of ECFV, was 0.218 ± 0.01 L/kg. The conclusion was made that ECFV of horses can be estimated by measuring bromide concentrations in a preinfusion serum sample and a sample obtained 5 hours after the administration of bromide.

Original languageEnglish (US)
Pages (from-to)213-217
Number of pages5
JournalJournal of Veterinary Internal Medicine
Issue number2
StatePublished - Mar 2003


  • Fluid balance
  • Pharmacology

ASJC Scopus subject areas

  • veterinary(all)


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