Diclazuril is used for the prevention of coccidiosis caused by Eimeria tenella, E necatrix, E. acervulina, E brunetti, E. mitis (mivati), and E. maxima. Because diclazuril is effective against E. maxima later in its life cycle, subclinical intestinal lesions may be present for a short time after infection. Diclazuril has been shown to reduce lesion scores and improve performance and health of birds challenged with E. maxima. .