I have a buddy that used to pop Adderall quite a bit. He's a training feak! The kinda guy that never misses a workout, no matter how late he stayed out the night before, etc. Anyway, he was taking Adderall pretty regularly, along with other OTC supps, and NO GEAR. He was laying on his couch watching a football game when his whole left side went numb, his heart rate would race extremely high - then go back to normal. It scared him enough to have his girl take him to the ER where his heart rate spiked like it did while he was at home. The doc prescibed him a couple things and sent him home later that night after the heart rate spikes seemed to have stopped. Anyway, the dude is a pretty clean living person outside of the Adderall and he swears the Adderrall is what caused his heart problem. It never happened to him before taking it and since he stopped, it has not happened again. Just something to think about if your thinking about trying it.