Ciadox is Quinoxaline 1,4-dioxide derivative with antimicrobial and promoting activities. Cyadox supplied as premix in the final feed in Eastern Europe and may be used in pigs up to four months of age. Some evidence demonstrated that the mechanism of Ciadox for improving pig growth performance was correlated with several metabolic hormones and growth factors. Cyadox also did not show any adverse effects in carcinogenicity tests with rats and long-term toxicity tests with mice and rats. Cyadox subchronic oral toxicity evaluation shows mild toxicity in non-rodents animals. Metabolic transformation of Ciadox leads to three major metabolites, including 1,4-bisdesoxycyadox, 4-desoxycyadox, and quinoxaline-2-carboxylic acid. Ciadox and metabolites shows virtually no toxic effects in the acute and subchronic oral toxicity study and no mutagenic, carcinogenic activivt.