dexadrine (dextroamphetamine) is the stuff you want, but it's a prescription item... I had a few caps of it over the summer and would love to get my hands on some again. speedy, speedy, speedy! weeeeeeeeeeeee!
the only thing that comes close are thermogenic formulas like thermadrene or xenadrene (sp?), which contain things like ephedrine (in the form of Ma Huang), guarana seed, caffeine, aspirin, cayenne pepper, ginger root, and sometimes L-Carnatine or Ginseng, too.
thermogenics are good for bodybuilding, losing weight, extra energy, mental alertness, and of course having a lot of fun w/
I've found that I start feeling the effects about an hour or so into taking one, peak around the 2:30-3:00 hour, then need another when the 4th hour comes around if I want to stay up.
you should try not to take them too often, else you'll develop a tolerance to them and you'll be putting yourself at risk for racing up your heart rate... my bottle of thermadrene states "the maximum recommended dosage of ephadrine for a healthy adult is 100 mg in a 24-hour period for not more than 12 weeks." each cap of thermadrene contains 20 mg of ephedrine.
you can also buy ephedra in health food/vitamin stores... I was in heaven the other day when I went to the new Vitamin Shoppe that opened up near my flat when I saw walls of thermogenics, ephedra, L-Carnatine, Guarana Seed, and Ginseng all in the same area, all at 30% off! I also noticed they sell bags and bags of empty clear gelcaps in varying sizes, for those of you who might need to know such things...
yay vitamins