This item may qualify for a Zoetis Rebate! Visit their rebate site for more details.Anthelcide EQ by Zoetis (previously by Pfizer Animal Health) is a broad-spectrum dewormer for horses and ponies. This paste dewormer contains the active ingredient Oxibendazole to help remove and control several species of internal parasites at different life stages. One syringe can treat horses up to 1,200 lbs of body weight and comes in a conveniently market tube for accurate dosing.