I think that it is a good thing that your parents are still searching for the best possible treatment for your brother, which will make his life a lot easier. As for Epinephrine, it comes in the form of Nebulizer Solution and I have been using it for problems with asthma too. It helps with shortness of breath, chest pain, and some other symptoms by making air passages much wider, but I have to admit that I dont know if that is adrenaline.
These tow medications, even though they have similar effects are different in their structures and mechanism. Also, their side effects are different, and it just might be that Ephedra is a bit more dangerous. It should not be mixed with stimulants (coffee, for example) or some other medication (for cold). Heart rate and blood pressure levels are increased while taking this drug.