Wow, you twat. You are supposed to take one pill a day for ANY ADHD medication unless stated otherwise on the bottle.
There is a HEAVY amount of addictive substance in all ADHD medications and once you start, it will be really hard to stop if you have not witnessed already.
Also your body will begin to grow immune to the medication and their effects will become less and less powerful and eventually they stop working all together but by then your addiction will have grown tremendously.
My Suggestion: DON'T FUCK WITH ADHD MEDICATION UNLESS YOU HAVE BEEN PROFESSIONALLY DIAGNOSED FOR IT. It will fuck up your life.