Anthelcide EQ is a paste wormer containing oxibendazole for horses. It is effective against large strongyles, small strongyles, pinworms, and ascarids in horses. Anthelcide EQ horse wormer is safe for pregnant mares, foals and breeding stock. Each tube deworms a horse up to 1,200 lbs. (up to 800 lbs. if the treatment is targeted against intestinal threadworms). The dispensing syringe is calibrated at 100 lb. increments. Oxibendazole.