When i was about 14/15yrs old, thats when i first got RXed Adderall and Dexedrine and began abusing the living shit out of it, at that young age is when i could tolerate such high doses at once (ex:taking 300-400mg at once, and redosing with hundreds ofMG's during that day), staying up days on end, eating baking soda, not eating food. i began to get very paranoid it was unreal and so out of touch with reality. i was napping for small intervals and go to confused i woke up at 7 PM thinking it was 7am and went out to the bus stop to meet kids selling adderall, only looking like a fool. I have learned that once u take your dose, there is no point in re-dosing, you will not experience that explosive euphoria from thee 1st dose, your only prolonging the duration of the buzz, and increasing negative side effects and CNS Stimulation, at 16 i stopped using that shit till i was 23, and began using again, only to realize my body can handle no more than 80mg at once..regularily i take 60mg TOPS, and redose 2 times after with a lower dose. i only do it a few times a month, i wasted so much adderall redosing and tkaing enermous amounts. TOLERANCE does go down, however onc eu lose that magic u once got from it, u lose it for good, dont get me wrong, its still enjoyable..but be smart..