first time user, dont go above 40mgs, and make sure ur on an empty stomach to prevent stomach upset ur first dose. as you crash, you will need to redose at 40mg just like u started off as thats where ur tolerance will be at the first dose, and actually you won't get a new burst of euphoria, just the only difference by redosing for the 3 day period is that it will make the duration longer, not the euphoria, bhasically u u will be redosing to feel normal and not depressed or crashing. it gets to a point where you will deplete all the chemicals in ur brain that even redosing wont be beneficial for staying awake, increased concentration, your gonna need a break, sleep, food, etc to get them chemicals back in ur brain, and bet ur ass 40mg as ur starting dosed will escalate to over 100mgs+++++, use it orally for a longer duration.