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1 September 2006 PHARMACOKINETICS AND PHARMACODYNAMICS OF CARFENTANIL AND NALTREXONE IN FEMALE COMMON ELAND (TAUROTRAGUS ORYX)
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Abstract

The pharmacokinetic parameters of carfentanil and naltrexone were determined in the common eland (Taurotragus oryx). Six adult females were immobilized with xylazine (0.23 ± 0.03 mg/kg i.m.) and carfentanil (0.0169 ± 0.0005 mg/kg i.m.) for a 45-min period, during which time routine health care procedures were performed. Heart and respiration rates and body temperatures were monitored throughout the immobilization period. A single intramuscular injection of naltrexone (1.66 ± 0.08 mg/kg i.m.) was sufficient for reversal. The eland were intermittently restrained in a hydraulic squeeze chute for serial blood sample collection via jugular venipuncture during immobilization and up to 48 hr post-immobilization. The quantification of carfentanil and naltrexone in the plasma was performed by liquid chromatography and mass spectroscopy methods. Carfentanil was rapidly absorbed following administration, with the peak plasma concentration (Cmax) at 13.8 min. Naltrexone was readily absorbed and reached Cmax at 23.4 ± 16.8 min after administration. All animals stood 2.7 ± 2.2 min after naltrexone administration. Carfentanil has a half-life of 7.7 hr, whereas naltrexone has a much shorter half-life of 3.7 hr. Although respiratory rates appeared to fluctuate widely among animals, heart rates and body temperature remained stable throughout the immobilization. Renarcotization was not noted as a major complication.

Alexander Cole, Adrian Mutlow, Ramiro Isaza, James W. Carpenter, David E. Koch, Robert P. Hunter, and Betsy L. Dresser "PHARMACOKINETICS AND PHARMACODYNAMICS OF CARFENTANIL AND NALTREXONE IN FEMALE COMMON ELAND (TAUROTRAGUS ORYX)," Journal of Zoo and Wildlife Medicine 37(3), 318-326, (1 September 2006). https://doi.org/10.1638/05-070.1
Received: 22 July 2005; Published: 1 September 2006
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