Narasin 20% Premix is a valuable veterinary medication used to prevent and treat coccidiosis in poultry. Specifically, it targets the protozoan parasites of the genus Eimeria, which cause this debilitating disease. Narasin is produced by fermentation of a strain of Streptomyces aureofaciens. It is an ionophore, meaning it forms neutral complexes with monovalent and divalent cations and transports them through apolar phases, including lipid bilayer membranes. This mechanism helps control coccidiosis effectively. However, it should never be administered to non-target species, as horses and dogs are highly susceptible to its toxic effects