Answer:
ADD drugs are supposed to selectively stimulate the frontal lobe of the brain. Since (in theory) ADD is caused by/results in lower-than-normal frontal lobe activity, the drugs should allow clearer thinking and better self control IF the patient has ADD. If not, the drugs act as any other amphetamine--thus the warnings.
Ephedra (Ma Huang) is actually an extract of a popular herb in Chinese Medicine, with several uses. In small quantities in combination with other herbs,it can be quite useful. Taken in larger quantities all by itself, it is a powerful metabolic and CNS stimulant--and there have been some very bad reactions from people who have done this (including heart attack). DO NOT take it except under the supervision of a medical professional, preferably someone trained in the use of Chinese herbs.
Here's the deal. If you actually HAVE add, the drug affects you differently than someone who doesn't have it. I know that because my son had to take it and I'v read alot on it. So, when you actually need it, it works right. If you don't need it, it can't do the same thing. (No different than me having high blood pressure and taking meds. If a person that doesn't have hbp, it will affect them differently than me. See?) Ephedra is different. It will speed up anyone's system. Stay away from that crap.