Anthelmintic Benzimidazoles in Eggs

Benzimidazole derivatives are anthelmintic drugs that are widely used in the treatment of parasitic infections in animals destined for food production. In general, anthelmintic residues in foods do not pose any risk for human health, as long as the drugs are administered appropriately and at the recommended dose using the specified withdrawal times. Misuse of these compounds increases the likelihood of the presence of residues in foods of animal origin and hence, the risk of human exposure to these toxic agents. In this chapter, the authors address the characteristics of benzimidazoles, as well as the maximum residue limits established for these substances for the purpose of protecting human health. Attention is focused on the mode of action of benzimidazoles after their administration, and the presence of benzimidazole residues in eggs from poultry treated with anthelmintics. The analytical methods for determining benzimidazole residues in eggs are reviewed.