Strongid C 2X Pyrantel Tartrate 2.11% a pelleted pyrantel tartrate wormer. For the control of large strongyles, small strongyles, pinworms and ascarids. To be administered on a continuous basis either as a top-dress or mixed in the horse’s daily grain at the rate of 2 ounces per 1,000 pounds of body weight. Safe for mares at any stage of pregnancy or lactation. Stallion fertility is not affected by the use of Strongid 2X.