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Article
Synovial fluid pharmacokinetics of tulathromycin, gamithromycin and florfenicol after a single subcutaneous dose in cattle
BMC Veterinary Research
  • Meredyth L. Jones, Texas A&M University
  • Kevin E. Washburn, Texas A&M University
  • Virginia R. Fajt, Texas A&M University
  • Somchai Rice, Iowa State University
Document Type
Article
Publication Version
Published Version
Publication Date
1-1-2015
DOI
10.1186/s12917-015-0346-4
Abstract
BackgroundDeep digital septic conditions represent some of the most refractory causes of severe lameness in cattle. The objective of this study was to determine the distribution of tulathromycin, gamithromycin and florfenicol into the synovial fluid of the metatarsophalangeal (MTP) joint of cattle after single subcutaneous administration of drug to evaluate the potential usefulness of these single-dose, long-acting antimicrobials for treating bacterial infections of the joints in cattle. ResultsTwelve cross-bred beef cows were randomly assigned to one of the drugs. Following subcutaneous administration, arthrocentesis of the left metatarsophalangeal joint was performed at various time points up to 240 hours post-injection, and samples were analyzed for drug concentration. In synovial fluid, florfenicol pharmacokinetic parameters estimates were: mean Tmax 7 +/− 2 hours, mean t½ 64.9 +/− 20.1 hours and mean AUC0-inf 154.0 +/− 26.2 ug*h/mL. Gamithromycin synovial fluid pharmacokinetic parameters estimates were: mean Tmax 8 hours, mean t½ 77.9 +/− 30.0 hours, and AUC0-inf 6.5 +/− 2.9 ug*h/mL. Tulathromycin pharmacokinetic parameters estimates in synovial fluid were: Tmax 19 +/− 10 hours, t½ 109 +/− 53.9 hours, and AUC0-inf 57.6 +/− 28.2 ug h/mL. Conclusions In conclusion, synovial fluid concentrations of all three antimicrobials were higher for a longer duration than that of previously reported plasma values. Although clinical data are needed to confirm microbiological efficacy, florfenicol achieved a synovial fluid concentration greater than the MIC90 for F. necrophorum for at least 6 days.
Comments

This article is from BMC Veterinary Research 11 (2015): 26, doi:10.1186/s12917-015-0346-4. Posted with permission.

Rights
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.
Copyright Owner
Jones et al.
Language
en
File Format
application/pdf
Citation Information
Meredyth L. Jones, Kevin E. Washburn, Virginia R. Fajt and Somchai Rice. "Synovial fluid pharmacokinetics of tulathromycin, gamithromycin and florfenicol after a single subcutaneous dose in cattle" BMC Veterinary Research Vol. 11 (2015) p. 26
Available at: http://works.bepress.com/somchai_rice/2/