Is this the slow kill method you're talking about?
Heartgard (slow kill)
The "slow kill" method, which is a newer approach, is the one prefered by us for treatment of dogs who are in Stage 1 of the infection. It consists of giving the dog Heartgard on a monthly basis. This heartworm preventative medication has some effect against the adult worms and should gradually eliminate them over a period of one to two years; without treatment, the worms can live up to five years. The earlier the treatment is started after infection, the more quickly it will work to eliminate the adult worms. Note that only Heartgard (ivermectin) should be used, as Revolution (selamectin) affects far fewer adult worms, and Interceptor (milbemycin oxime) almost none at all.
https://www.petrescuebyjudy.com/info...ay?PageID=5811
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