Pharmacokinetics of a long-acting ceftiofur crystalline-free acid formulation in Asian elephants (Elephas maximus)

Michael J. Adkesson, Randall E. Junge, Matthew C. Allender, Tomás Martín-Jiménez

Research output: Contribution to journalArticlepeer-review


Objective-To determine the pharmacokinetics of a long-acting formulation of ceftiofur, ceftiofur crystalline-free acid (CCFA), following SC injection to Asian elephants (Elephas maximus). Animals-11 adult Asian elephants. Procedures-Each elephant received CCFA (6.6 mg/kg, SC) in the area caudoventral to the base of an ear. Blood samples were collected from an ear vein immediately prior to and at 0.5, 1, 2, 4, 8, 12, 24, 36, 48, 72, 96, 120, 144, and 168 hours after CCFA administration. Plasma concentrations of desfuroylceftiofur acetamide (the acetamide derivative of ceftiofur) were measured via ultrahigh-pressure liquid chromatography-tandem mass spectrometry. Data were analyzed via a noncompartmental pharmacokinetics approach. Results-The mean ± SD maximum plasma concentration of desfuroylceftiofur acetamide was 1.36 ± 0.74 μg/mL and was detected at 47.18 ± 31.30 hours. The mean ± SD area under the curve from time 0 to infinity was 227.8 ± 55.8 μg•h/mL, and the mean residence time from time 0 to infinity was 158.2 ± 90.2 hours. The terminal elimination half-life associated with the slope of the terminal phase had a harmonic mean ± pseudo-SD of 83.36 ± 30.01 hours. Conclusions and Clinical Relevance-Elephants tolerated CCFA at a dose of 6.6 mg/kg, SC, well. Dosing recommendations will depend on the mean inhibitory concentration of ceftiofur for each bacterial pathogen. Desfuroylceftiofur acetamide concentrations remained > 0.25 μg/mL for the entire 168-hour study period, which suggested CCFA would provide clinically relevant antimicrobial activity against certain pathogens for 7 to 10 days.

Original languageEnglish (US)
Pages (from-to)1512-1518
Number of pages7
JournalAmerican journal of veterinary research
Issue number10
StatePublished - Oct 2012

ASJC Scopus subject areas

  • General Veterinary


Dive into the research topics of 'Pharmacokinetics of a long-acting ceftiofur crystalline-free acid formulation in Asian elephants (Elephas maximus)'. Together they form a unique fingerprint.

Cite this