Yes, that was the point I was trying to make. There's no reason to be afraid of using this product, it is very effective, but you should have a vet involved. And it's always good to have questions to ask your vet, for instance asking if this product would be a good idea.
I don't change anything in my horses diet/life without at least calling the vet to get their opinion first.
Edit: My vet also said we had to wait on blood results to determine if she would be able to handle the Powerpac, so a blood draw will most likely be done, if for nothing else to see how the worms have affected the organs.