i'd stay far away from those pills if i were you.
weight loss pills have traditionally been on the cycle of approved... marketed... discovered to be dangerous... removed from market...
then a new, similar, non-banned active ingredient is synthesized and the process starts over.
a close friend of mine had to have her thyroid removed and will be on hormones for the rest of her life due to a then-legal bodybuilding supplement she was taking in the late 80s...