1. Pharmacokinetics of three formulations of vitacoxib in horses
- Author
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Xiaohui Gong, Pan Sun, Jianzhong Wang, Jicheng Qiu, Xingyuan Cao, Hongzhi Xiao, Suxia Zhang, and Jing Li
- Subjects
Male ,Cmax ,Administration, Oral ,Biological Availability ,010501 environmental sciences ,Oral Paste ,01 natural sciences ,03 medical and health sciences ,Animal science ,Pharmacokinetics ,Oral administration ,Animals ,Medicine ,Horses ,Sulfones ,030304 developmental biology ,0105 earth and related environmental sciences ,Pharmacology ,0303 health sciences ,Cross-Over Studies ,General Veterinary ,business.industry ,Parallel design ,Imidazoles ,Horse ,Noncompartmental analysis ,Area Under Curve ,Injections, Intravenous ,Plasma concentration ,Female ,business ,Half-Life - Abstract
The pharmacokinetic properties of three formulations of vitacoxib were investigated in horses. To describe plasma concentrations and characterize the pharmacokinetics, 6 healthy adult Chinese Mongolian horses were administered a single dose of 0.1 mg/kg bodyweight intravenous (i.v.), oral paste, or oral tablet vitacoxib in a 3-way, randomized, parallel design. Blood samples were collected prior to and at various times up to 72 hr postadministration. Plasma vitacoxib concentrations were quantified using UPLC-MS/MS, and pharmacokinetic parameters were calculated using noncompartmental analysis. No complications resulting from the vitacoxib administration were noted on subsequent administrations, and all procedures were tolerated well by the horses throughout the study. The elimination half-life (T1/2λz ) was 4.24 ± 1.98 hr (i.v.), 8.77 ± 0.91 hr (oral paste), and 8.12 ± 4.24 hr (oral tablet), respectively. Maximum plasma concentration (Cmax ) was 28.61 ± 9.29 ng/ml (oral paste) and 19.64 ± 9.26 ng/ml (oral tablet), respectively. Area under the concentration-versus-time curve (AUClast ) was 336 ± 229 ng hr/ml (i.v.), 221 ± 94 ng hr/ml (oral paste), and 203 ± 139 ng hr/ml, respectively. The results showed statistically significant differences between the 2 oral vitacoxib groups in Tmax value. T1/2λz (hr), AUClast (ng hr/ml), and MRT (hr) were significantly different between i.v. and oral groups. The longer half-life observed following oral administration was consistent with the flip-flop phenomenon.
- Published
- 2020
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