摘要:
A substituted 1,2,4-triazine-3,5-dione derivative having the formula (I) or a salt thereof: ##STR1## wherein R represents a 5- or 6-membered heterocyclic group which may have at least one substituent selected from the group consisting of a halogen, a lower alkyl group and a halogenated lower alkyl group, and an anticoccidial drug composition containing the same as an active component.