well here is my thought..it was made for people with narcolepsy and is some times promoted by many web sites for ADD/ADHD.other uses are for obstructive sleep apnea/hypopnea and shift work sleep disorder,a Doping agent,cognitive enhancing,antidepressants,appetite reducing/weight loss and a hole list of other things..
what do you want to use it for...
if just to stay awake have more energy there are better things out there but a starting
dose of 200mg after waking up in the morning is a good start...you will still be able to get to sleep at night..
if using it for other reasons let me know ill look into it.