Anthelcide EQ Paste Horse Dewormer contains Oxibendazole in a 22.7% formula proven 97%-100% effective against major internal parasites. For oral treatment of large and small strongyles, pinworms, roundworms and threadworms in horses and foals. Dosage: One 24 gm syringe for general deworming of a 1,200 lb horse or an 800 lb horse for threadworm control.