By Pfizer/SmithKline Beecham. Eliminate roundworms and hookworms in puppies and adult dogs. Give directly or mix with food. Can be given with heartworm medicine, no fasting necessary. Ideal for small dogs and approved for pregnant females. One teaspoon per 10 lbs. of body weight. No prescription required. Size: 16 oz. / 473 ml. - 95 tsp. Additional size available.