Pharmacokinetics of cyadox and its main metabolites in rats, pigs, chickens, and carps following oral administration at three dosage.

Regulatory Toxicology and Pharmacology : RTP
Sechenchogt HarnudLingli Huang

Abstract

Cyadox (CYA), a 1,4-dioxide quinoxaline, is a safe and effective antibacterial agent with potential use in food-producing animals. The aim of this study was to compare the pharmacokinetics of CYA (Cy0) and its main metabolites [bisdeoxycyadox (Cy1), 4-desoxycyadox (Cy2), N-(quinoxaline-2-methyl)-cyanide acetyl hydrazine (Cy4), quinoxaline-2-carboxylic acid (Cy6), and 2-hydromethyl-3-hydroxy-quinoxaline (Cy12)] after oral administration at three dosages in pigs, chickens, carps, and rats. The concentration vs. time profile in plasma after single oral administration indicated that CYA was rapidly dissociated into its metabolites and showed the widest distribution in all animals, with the highest apparent volume of distribution. Cy0 and Cy6 persisted for the longest time at lower concentration. Cy1and Cy4 concentration was the highest in pig and rat plasma, while Cy1 was undetectable in chickens, and Cy4 was undetectable in carps following administration at three dosages. Different dosage of the CYX and its metabolites had no significant effect on wash-out period. This study revealed obvious species-specific differences in the kinetic behavior of CYA and its metabolites, which may be related to clinical efficacy and toxicity. Our ...Continue Reading

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