There is a $39 per incident fee, payable by credit card. This fee covers the initial consultation as well as all follow-up calls associated with the management of the case. I've used them...they are very knowledgeable and good to work with. Their website is http://www.petpoisonhelpline.com/
The issue is that you need to know how much of the drug was ingested. Although the dog vomited you don't know how much came up ans how much is still there. Depending on a number of factors kidney damage could occur along with other health concerns. Better safe than sorry.
I have been in your shoes. I headed straight to the emergency vet for activated charcoal and an iv to flush the kidneys.