I went ahead and emailed and they said 11 weeks. 

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Can anyone confirm what the active ingredient is? I called Twin Cities and the gal that answered didn't know. She said that they get it from England and re-package it. -KathyQuote:
I know this post is old, but just reporting that Worminator is great stuff.
Thanks... I've read posts where people say that, and I've read other posts where people say it's flubendazole. If it is pyrantel pamoate, they're robbing people blind *and* lying about it being effective on *all* worms, lol. Will call them on Tuesday and try to figure it out.I think it's pyrentyl paomate (sp).