I felt so bad when I was treating for one worm hitting them with everything I had for a few months, only to mistakenly find out it was the other worm. I would get a fecal into the vet if at all possible.
http://www.dogclinic.net/faq/tapeworms/84.htm
here is a goodlink for a photo of the different way the tapeworms can look. Sorry to go off on worm types. You were just asking about the meds. lol
I have used them both for a really hard case of worms. I did use the Wazine first then hit with the Valbazene after the waiting period from the Wazine. Then redosed with Valbazene again in 10 days. I tried the Ivermectin a year ago, and really saw no difference. The Valbazene did work good...