Though I don't think you're a candidate to use such things and you need to examine what you're doing in terms of exercise and diet before taking the lazy man's way out of things.... I think anyone who isn't well-read on the subject of ephedrine/ephedra would be suited reading this:
DrumLib's Health Research Review
There is a time and a place for it's use with caffeine for SOME. Not most though.
And yea, there are dangers associated with it's use. Most are blown way out of proportion and/or over-hyped.... but the drug can be very dangerous for select populations.... like hypertensive individuals.