Dimetridazole, ipronidazole, metronidazole and ronidazole are used for the treatment and prevention of bacterial and protozoal diseases in animals, in particular turkeys and pigs. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) advised Codex that it is not possible to establish a safe level of the residue of these veterinary drugs in foods such as meat, kidneys or liver. Based on that, the Codex Alimentarius Commission has adopted a recommendation that competent authorities in countries should prevent residues in food.
Monday July 6, 2015/ FAO. http://www.fao.org