I was wondering this too. Seems like I remember reading this somewhere, that it does. I have been battling flukes for months now, and would always see big chunks of them in my stool. Now on my third day of Prazi, and I don't see any more big chunks. I do see what I'm sure are smaller pieces, but they're so "vaporized" that I can't really pick them out with the tweezers to add them to my collection, they just kind of disintegrate when I try to grab them.