coccidiostat coccidiostat a coccidiostat is an antiprotozoal agent that acts upon coccidia parasites. chemical structure of decoquinate, a coccidiostat used in veterinary medicine examples include: amprolium arprinocid artemether clazuril clopidol decoquinate diclazuril dinitolmide ethopabate halofuginone lasalocid monensin narasin nicarbazin oryzalin ponazuril robenidine roxarsone salinomycin spiramycin sulfadiazine sulfadimethoxine toltrazuril