Sorry, but no. Most sources put the LD50 for Adderall close to 1400 mg, but that means that half the people who consume that dose will die, not that it is the minimum amount to kill you. Many people will succumb at lower doses, and many will tolerate more without dying. For someone taking the above average dose of 50 mg Adderall daily, that would be a month's worth of pills.

But the data is very clear that the vast majority of overdoses from stimulants are from street stimulants, not from prescription stimulants. Street stimulants are probably more lethal on a mg basis than are prescription stimulants, and are far more likely to be lethal when inhaled or injected, because concentrations at the neurotransmitters receptors rise much more quickly and higher.