Oh I don't think these would work with Dukan! For a start you are cutting out the fats that these drugs work on, so that makes them a bit redundant. I tried them pre-Dukan and they had all the predictable effects - loose stools, wind, general discomfort - in a word, the squits! But what they didn't do was shift the weight...
So I wouldn't recommend, and its not a long term solution anyway.