Development of a physiologically based pharmacokinetic model to predict tulathromycin distribution in goats

T. L. Leavens, Lisa A Tell, Kristin A Clothier, R. W. Griffith, R. E. Baynes, J. E. Riviere

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Physiologically based pharmacokinetic (PBPK) models, which incorporate species- and chemical-specific parameters, could be useful tools for extrapolating withdrawal times for drugs across species and doses. The objective of this research was to develop a PBPK model for goats to simulate the pharmacokinetics of tulathromycin, a macrolide antibiotic effective for treating respiratory infections. Model compartments included plasma, lung, liver, muscle, adipose tissue, kidney, and remaining poorly and richly perfused tissues. Tulathromycin was assumed to be 50% protein bound in plasma with first-order clearance. Literature values were compiled for physiological parameters, partition coefficients were estimated from tissue:plasma ratios of AUC, and the remaining model parameters were estimated by comparison against the experimental data. Three separate model structures were compared with plasma and tissue concentrations of tulathromycin in market age goats administered 2.5mg/kg tulathromycin subcutaneously. The best simulation was achieved with a diffusion-limited PBPK model and absorption from a two-compartment injection site, which allowed for low persistent concentrations at the injection site and slower depletion in the tissues than the plasma as observed with the experimental data. The model with age-appropriate physiological parameters also predicted plasma concentrations in juvenile goats administered tulathromycin subcutaneously. The developed model and compilation of physiological parameters for goats provide initial tools that can be used as a basis for predicting withdrawal times of drugs in this minor species.

Original languageEnglish (US)
Pages (from-to)121-131
Number of pages11
JournalJournal of Veterinary Pharmacology and Therapeutics
Volume35
Issue number2
DOIs
StatePublished - Apr 2012

Fingerprint

Goats
pharmacokinetics
Pharmacokinetics
goats
injection site
Injections
Macrolides
macrolide antibiotics
drugs
Respiratory Tract Infections
Pharmaceutical Preparations
Area Under Curve
partition coefficients
tulathromycin
Adipose Tissue
adipose tissue
Anti-Bacterial Agents
Kidney
Muscles
Lung

ASJC Scopus subject areas

  • Pharmacology
  • veterinary(all)

Cite this

Development of a physiologically based pharmacokinetic model to predict tulathromycin distribution in goats. / Leavens, T. L.; Tell, Lisa A; Clothier, Kristin A; Griffith, R. W.; Baynes, R. E.; Riviere, J. E.

In: Journal of Veterinary Pharmacology and Therapeutics, Vol. 35, No. 2, 04.2012, p. 121-131.

Research output: Contribution to journalArticle

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