Here is her reply:
I've used it once when I thought Jack ate an acetaminophen tablet. When I worked as a receptionist at a vet I saw the vets do it often and gave him 1cc of peroxide every few minutes in a needless syringe till he hurled. It was horrible waiting. fortunately it was a hidden piece of kibble and not the tablet I dropped.
Like the page says, and like you need to be in kids, you need to be cautious when you give it. You want to make sure it isn't something that is going to be doing more damage coming out (like caustic stuff).
Feel free to share.. it is a good piece of information to have.