Horse Health Ivermectin Paste 1.87% Dewormer is a highly effective treatment for a wide range of parasites commonly found in horses. With a concentration of 1.87%, this paste is suitable for horses up to 250 lbs and effectively treats large and small strongyles, pinworms, bots, and more. The apple-flavored paste is safe for use on all horses, including broodmares, stallions, and foals, providing a convenient and reliable solution for deworming your equine companions.