For treatment and 100 day control of ivermectin-sensitive strains of internal and external parasites including benzimidazole-, levamisole-, morantel-, and closantel-resistant worms, nasal bot and itchmite of sheep. Controls ked infestations. Aids in the prevention of dags and in the control of blowfly strike in the breech area. Reduces pasture contamination with worm eggs for at least 100 days