Yea they make you speed your ass of and they make you focus like a mother fucker. My sis use to be perscribed. But it depends on what milligram you got to determine how much you take. 20mg. time realesed you should take one or snort one. But if your an very expierenced speed freak then it may take 3 or 4. 10mg you should take 2 or 4 to 6 if your expierenced.

Snortin or poppin it, it dont matter. And they just help you focus, if your ADHD you take this shit so ofcourse it's for focusing.