Drontal is the only wormer that kills every type of intestinal worm commonly found in dogs and cats. Use Drontal at least every three months. Drontal is a prescription medication that contains the active ingredients praziquantel, pyrantel pamoate, and febantel. Drontal is effective against tapeworms, hookworms, roundworms, and whipworms. Drontal is convenient in an easy, single-dose administration. Drontal tablets are scored for easy breakage. Drontal rarely causes side effects. Drontal is good for use in kittens and puppies 4 weeks or older.