The medicine to treat adult heartworm is a cyanide. The worms can't process and eliminate it but dogs can.Ivermectin kills the immature worms as a preventative, or along with the other drug in treatment.
Never heard of cyanide being used. Arsenic has been used in doses that were sub-lethal to the dog.
Wonder how many people have killed their dogs "self doctoring" so far?
Don't take internet advice.
Take your dog to the vet for heart worm screening to see if it has heart worms. Then proceed with what medicines the vet prescribes for the weight, breed, and age of the dog.
I thankful that I'm not a dog belonging to some of you...
