(Pfizer Animal Health) Anthelcide EQ equine wormer paste formula contains Oxibendazole. Effective against large strongyles, small strongyles, pinworms and ascarids in horses. Anthelcide EQ is safe for pregnant mares, foals and breeding stock. Each tube worms up to a 1200 lb. horse (800 lb. if targeted against intestinal threadworms) and is calibrated at 100 lb. increments.