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Pharmacokinetic–pharmacodynamic cutoff values for doxycycline in pigs to support the establishment of clinical breakpoints for antimicrobial susceptibility testing

Pelligand, Ludovic; Toutain, Pierre-Louis; Bouquet-Mélou, Alain; Ferran, Aude; Roques, Béatrice; del Castillo, Jérôme; Lees, Peter; Croubels, Siska; Bousquet, Eric

Authors

Ludovic Pelligand

Pierre-Louis Toutain

Alain Bouquet-Mélou

Aude Ferran

Béatrice Roques

Jérôme del Castillo

Peter Lees

Siska Croubels

Eric Bousquet



Abstract

This meta-analysis provides a population model of doxycycline (DOXY) disposition in pigs for computation of PK/PD cutoff values corresponding to differing modalities of DOXY administration orally in pigs. This analysis enables establishment of specific clinical breakpoints for the development of antimicrobial susceptibility testing of DOXY in pigs. The meta-analysis of 380 data sets, totaling 3295 plasma concentrations obtained from 300 pigs weighing 8.5 to 101 kg, was performed using a Non-Linear Mixed Effect Model. The plasma clearance for a typical 50 kg BW pig was estimated to be 0.259 L/kg/h with a corresponding plasma half-life of 7.33 h. The bioavailability of DOXY administered in feed under field conditions was estimated to be 50%, with a large between subject variability of 84.8%. The bioavailability of DOXY in solution in drinking water was significantly lower (30.7%) but much less variable, with a between subject variability of 34.3%. Several dosing schedules (5 to 20 mg/kg per day) for two administration modalities (drinking water vs. food) were simulated to calculate the corresponding PK/PD cutoffs. The highest PK/PD cutoff of 0.50 mg/L was obtained for DOXY administered in feed at 20 mg/kg BW.

Citation

Pelligand, L., Toutain, P.-L., Bouquet-Mélou, A., Ferran, A., Roques, B., del Castillo, J., Lees, P., Croubels, S., & Bousquet, E. (2025). Pharmacokinetic–pharmacodynamic cutoff values for doxycycline in pigs to support the establishment of clinical breakpoints for antimicrobial susceptibility testing. Journal of Veterinary Pharmacology and Therapeutics, https://doi.org/10.1111/jvp.13511

Journal Article Type Article
Acceptance Date Mar 26, 2025
Publication Date Apr 17, 2025
Deposit Date Nov 29, 2024
Publicly Available Date Apr 28, 2025
Journal JVPT
Print ISSN 0140-7783
Electronic ISSN 1365-2885
Publisher American Academy of Veterinary Pharmacology and Therapeutics
Peer Reviewed Peer Reviewed
DOI https://doi.org/10.1111/jvp.13511

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