Heartgard plus - no Rx Prescription Required. New look pack contains 6 chew-able tablets, to be given as one per month for the prevention of heartworm disease. Heartgard Plus also controls roundworm and hookworm, but not tapeworm or whip worm. Heartgard Plus beef flavor chewable for dogs with Ivomectin and Pyrantel. For the Prevention of Heartworm Disease. Also treats Ascaraids - Roundworm and Hookworm. Administer once a month. Note!! Dogs should be vet tested Adult Heartworm Clear before giving this medication. Highly recommended by vets.