I'd say no, at least until the science of "carb blocking" is well-established. The best carb-blocker is a brain that can read labels.

Most diet drugs contain stimulants which are contrary to the Rules of Induction because they can destabilize blood sugar.

A good multivitamin (w/ no iron) is a good idea, and some dietary supplements (calcium, leutein, potassium) seem to help some folks.

Edited to add: my calico siamese cat was on my lap demanding attention while I typed that; I think she's jealous, Katgurl.