Clazuril is a man‑made anticoccidial agent primarily used in veterinary settings to manage protozoan infections in animals, particularly in poultry. Chemically, it is a phenylacetonitrile derivative developed to act specifically against parasitic protozoa rather than bacteria. The compound is effective against various Eimeria species, the organisms that cause coccidiosis and lead to damage of the intestinal lining in affected animals. By disrupting both the asexual and sexual stages of the parasite’s life cycle, Clazuril inhibits the production and shedding of infectious oocysts. It is usually given orally and is appreciated for its effectiveness and a relatively favorable safety profile when used at proper dosages. These characteristics make it a key option for both preventing and treating outbreaks of coccidiosis in livestock. In poultry, its use supports better flock health and performance by reducing intestinal harm from parasitic infection. This, in turn, contributes to improved animal welfare and economic benefits for farmers. The compound is identified by the CAS number 101831‑36‑1, reflecting its established role in animal health. Studies have shown notable decreases in oocyst shedding after treatment, highlighting its practical efficacy in veterinary practice.
