Nuheart Heartworm tablets for Dogs with active ingredient Ivermectin is a monthly tablet used for the prevention of heartworm disease in dogs. It is a generic version of the Heartgard tablets. The active ingredient - Ivermectin is exactly the same as in Heartgard and each tablet contains exactly the same amount of ingredient. The tablets are meat flavored and are readily accepted by dogs. For difficult dogs Nuheart tablets can be dissolved in a small amount of water (or pounded into fine powder) to mix in the pet's food. Nuheart Heartworm tablets for Dogs are given once a month for the prevention of heartworm disease caused by the parasitic worm Dirofilaria Immitis in dogs. Nuheart eliminates the heartworm larvae that infect the dog during the previous month. Heartworm is spread by infected mosquitoes and the one of the most common to dog since its birth. Treatment should start, young and early, by the first assessment by the your local vet to ascertain the appropriate age to start heartworm control.