Fenbendazole, the active ingredient in all Safe-Guard products, is safe for deworming horses, including foals and pregnant mares and is very effective against the typical adult equine parasites. Safe-Guard 10% fenbendazole paste formula in a 25 gram paste syringe treats horses weighing up to 1,100 lbs and has a great apple-cinnamon taste that ensures less waste. It is effective against large strongyles, small strongyles, pinworms and ascarids. Safe in horses, even foals and pregnant mares. Perfect for general parasite control in rotational deworming. Deworming your horse is easier when you can choose the delivery method that works best for you and your horse. Safe-Guard (fenbendazole) comes in many forms and sizes and is effective against most common intestinal parasites of the horse. Refer to item #1850EB for Safe-Guard pellets that can be administered in the horses feed and also to item # 1850P for Safe-Guard Power Dose that specifically targets all stages of the ENCYSTED small strongyle, and against ascarids (roundworms) that may be resistant to other classes of dewormers.