| 6 MONTH Iverhart Plus BLUE 1-25 lbs 6 MONTH Iverhart Plus BLUE (1-25 lbs) New Generic Medication for HeartGard Plus. Iverhart Plus Administer once a month to prevent heartworm disease and to treat and control ascarid and hookworm infections in dogs. Each flavored chewable contains 68 mcg inermectin and 57 mg pyrantel as pamoate salt. A prescription is required for these products. Click here for details Heartworm Preventives Iverhart Plus by Virbac |