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Pharmacokinetics and bioavailability of tildipirosin in rabbits following single‐dose intravenous and intramuscular administration
Author(s) -
Xiong Jincheng,
Xu Yuliang,
He Shuang,
Zhang Yanfang,
Wang Zile,
Wang Sihan,
Jiang Haiyang
Publication year - 2020
Publication title -
journal of veterinary pharmacology and therapeutics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.527
H-Index - 60
eISSN - 1365-2885
pISSN - 0140-7783
DOI - 10.1111/jvp.12882
Subject(s) - pharmacokinetics , bioavailability , volume of distribution , pharmacology , distribution (mathematics) , chemistry , absorption (acoustics) , intramuscular injection , medicine , anesthesia , mathematics , acoustics , mathematical analysis , physics
Abstract The objective of this study was to determine the pharmacokinetics of tildipirosin in rabbits after a single intravenous (i.v.) and intramuscular (i.m.) injection at a dose of 4 mg/kg. Twelve white New Zealand rabbits were assigned to a randomized, parallel trial design. Blood samples were collected prior to administration and up to 14 days postadministration. Plasma concentrations of tildipirosin were quantified using a validated ultra‐high‐performance liquid chromatography tandem mass spectrometry (UPLC‐MS/MS) method. The pharmacokinetic parameters were calculated using a noncompartmental model in WinNonlin 5.2 software. Following i.v. and i.m. administration, the elimination half‐life (T 1/2λ ) was 81.17 ± 9.28 and 96.68 ± 15.37 hr, respectively, and the mean residence time (MRT last ) was 65.44 ± 10.89 and 67.06 ± 10.49 hr, respectively. After i.v. injection, the plasma clearance rate (Cl) and volume of distribution at steady state (V dss ) were 0.28 ± 0.10 L kg ‐1 h −1 and 17.78 ± 5.15 L/kg, respectively. The maximum plasma concentration (C max ) and time to reach maximum plasma concentration (T max ) after i.m. administration were 836.2 ± 117.9 ng/ml and 0.33 ± 0.17 hr, respectively. The absolute bioavailability of i.m. administration was 105.4%. Tildipirosin shows favorable pharmacokinetic characteristics in rabbits, with fast absorption, extensive distribution, and high bioavailability. These findings suggest that tildipirosin might be a potential drug for the prevention and treatment of respiratory diseases in rabbits.