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Vetmedin should only be administered to dogs who have been diagnosed with heart disease and have been given a prescription from their veterinarian.
Although I know full well that an equivalent generic product can be purchased almost anywhere ( or your pharmacist if you can swing that one) to offer them for sale here is illegal. I'm sorry.
I could suggest that you speak to your vet and discuss the possibility of them taking them, but as it sounds like the packages have been opened, that's not generally legal or ethical from a veterinarians point of view.
I'm very sorry to hear about the passing of your dog.