Effective against the following internal parasites: Horses: Mature and immature stages of Bloodworm (Strongylus vulgaris); Large Strongyles or Redworms, including the migratory tissue stages of S. edentatus; Large Roundworm, Pinworms, Small Redworms (Small strongyles or Cyathostome species susceptible to oxfendazole), mature Stomach Worms (Habronema microstoma), as well as the harmful migrating stages of the Bloodworm (S.vulgaris) (55-88percent activity) with corresponding reduction in arterial lesions.