Ephedra is a common ingredient in many "pick me ups." It's highly effective.
Used in unfit, untrained, individuals (i.e., fat folks), it can cause some issues with cardiac malfunction, but, its dangers are over-stated. In fat folks, they get to moving beyond what their state of health can support and things go south. Ephedra based products have been used for many years in weight loss.
I encourage the poster to Google up on Ephedra, and Ephedrine, to find articles like
Like aspirin, Tylenol, or food, ephedra can be dangerous if taken in to large of amounts.
Ephedra has been used for many, many, many years, in a variety of cultures with much success. It's a component in many drinks commonly used (read the research).
As with any chemical, or as with food, or exercise, it's good to be very judgmental and prudent in its use.
Is it as dangerous as high fat food? Probably not. Is it more dangerous than not taking anything. Yes.
flex89 is right that the ECA stack can be very stimulatory and not without side effects.
Like most things, it's a matter of personal choice, based upon an informed judgment.
For folks with respiratory issues, these drugs can be good because on their effects on those systems.
I'd encourage you to employ the resource of The Internet to do some research and decide what's best for you, absent of hearsay.
As part of your research, you might wish to research the ingredients of so called energy drinks. You may be surprised by what you find.