Zoetis Strongid C 2XStrongid C 2X is a concentrated top dress wormer used as effective preventative wormer for horses. Helps break the cycle of parasite infection. For use in all horses, including pregnant mares, stallions, and foals Contains pyrantel tartrate Add to daily ration Pelleted formula 50 lb bag = 400 daily doses for a 1,000 lb horse Keeping parasite levels under control helps your horse perform at his best. Parasites steal nutrition, energy and good health