Ephedrine is a phenethylamine and is similar to amphetamines. I dont know the difference in potency between the brands that market the pills, but normally 6 at once. Though I warn you, it is not worth it, unless your a 15 year old kid with nothing better to do. It makes your hair feel like its growing and your skin get very sensitive, and the 'high' which is more like a burst of energy, only lasts a short time compard to amphetamines, while the comedown is much more harsh. I highly not recommend it.