Used primarily as a veterinary anthelmintic, effective against a range of parasitic worms in livestock, especially liver flukes in sheep and cattle. It is commonly administered orally or topically to control infections caused by Fasciola hepatica. Also shows activity against certain external parasites like lice and mites. Has been investigated for potential antiviral and anticancer properties in research settings, though not approved for human use. Its long residual activity makes it suitable for preventive treatment programs in endemic areas.