| 6 MONTH Iverhart Plus GREEN 26-50 lbs 6 MONTH Iverhart Plus GREEN (26-50 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 136 mcg inermectin and 114 mg pyrantel as pamoate salt. A prescription is required for these products. Click here for details Heartworm Preventives Iverhart Plus by Virbac |