In medical use, there is controversy about whether the benefits of amphetamines prescribed for ADHD and weight loss outweigh the drug's harmful side effects. There is agreement, however, that prescription amphetamines are successful in treating narcolepsy.8 "Look-alike" drugs, which imitate the effects of amphetamines and contain substances legally available over-the-counter, including caffeine, ephedrine, and phenylpropanolamine, are sold on the street as "speed" and "uppers."9