There are currently 6 medications approved by the FDA for prevention of Heartworm disease in dogs and cats which come in a number of formulations under several brand names. (svg-vets.com)
Revolution kills adult fleas and prevents flea eggs from hatching for one month and is indicated for the prevention and control of flea infestations (Ctenocephalides felis), prevention of heartworm disease caused by Dirofilaria immitis, and the treatment and control of ear mite (Otodectes cynotis) infestations. (medi-vet.com)
Ivermectins are a class of drugs that are approved for prevention of heartworm disease in dogs and cats. (michigananimalhospital.com)