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Journal of the South African Veterinary Association

versión On-line ISSN 2224-9435
versión impresa ISSN 1019-9128

J. S. Afr. Vet. Assoc. vol.80 no.1 Cape Town  2009

 

ARTICLE

 

Residue depletion of colistin in swine after intramuscular administration

 

 

S S Tang; L J Gong; J K He; X Jin; X L Xiao

Division of Pharmacology and Toxicology, College of Veterinary Medicine, China Agricultural University, National Reference Laboratory for Veterinary Drug Residues, 2 Yuanmingyuan West Road, Haidian District, Beijing, 100193, People's Republic of China

 

 


ABSTRACT

A newly formulated colistin sulphate solution was prepared in a previous study as a potential agent for intramuscular injection and its effectiveness, toxicity and pharmacokinetics were investigated. In order to provide more information to establish scientific guidance for safe use of this preparation, its residue depletion in swine tissues following intramuscular administration was investigated in this experiment. Fifty healthy cross-bred piglets (13.3 ± 0.9 kg) were used in this study. Five animals were kept as untreated controls and the other 45 animals were intramuscularly injected with the colistin preparation at a dose of 2.5 mg/kg of body weight. From the treated piglets, 5 animals were randomly selected and sacrificed at different withdrawal times. Liver, kidney and muscle tissues were sampled to examine the colistin residue levels by microbiological assay. The results showed that the colistin residue in liver and muscle decreased quickly and could not be detected at 1 day after the final dosing. However, the residue depletion in the kidneys was much slower than that in other tissues and even a small quantity of drug could be detected at 14 days after withdrawal. Using the method recommended by the Committee for Veterinary Medical Products (CVMP), a withdrawal time of 10 days was established for the safe use of the newly formulated colistin sulphate solution.

Key words: colistin, intramuscular administration, microbiological assay, residue depletion, swine, withdrawal time


 

 

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Received: September 2008
Accepted: March 2009

 

 

*Author for correspondence. E-mail: xiaoxl@cau.edu.cn

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