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How long does adderall stay in your system after your last dose?

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14 Aug 2011

The half life of Adderall is about 10 hours.

This means that every 10 hours, half of the previous amount of Adderall in the body disappears.

For example, if you took 10mg of Adderall at 12AM (midnight), at 10AM 5mg of Adderall will be left in your body. At 8PM, 2.5mg will be left, and so forth until there is 0mg left in your body.

As a rough guide it takes about 5.5 half lives for a drug to be out of your system. For adderall then it would take just over 2 days for a dose to be out of your system.
(5.5 x 10 = 55 hours - which is just over 2 days)

Votes: +6
Anonymous 14 Jun 2012

Great answer and appreciated.

onceateacher 21 Jan 2013

Thank you. Very helpful to know as we work on dosages and how often to take them.

szf67 9 Oct 2013

What if u took 140 mg of it

szf67 9 Oct 2013

What if u did 140 mg

Dimitrioo 23 Jul 2014

@szf67 then you are an idiot! The maximum effective dosage is ~40mg, not 140mg!!

2 Dec 2013

Generally speaking, Adderall & it's similar meds by Shire & GlaxoSmithKline i.e. Dextrostat, Dexedrine, etc. is 72 hrs. for urine. It's effects last long... roughly 4 to 6 hrs. w/ a T-1/2 or half-life of roughly 10 to 14hrs. Meaning 50% of it's biological activity is 10 to 14hrs. However, many factors determine the longevity of said drug in ur system. For example: Ph Levels in the stomach & urine affect how fast or slow the body eliminates Adderall. Moreover, aside from tolerance (which can be acquired by no fault of ur own) there is a factor that sometimes escapes ppl. = the body is a remarkable piece of work and ur LIVER learns to break down the drug faster the longer one is on it- that goes for a lot of meds tho. So, if u take Adderall for a yr. then, yes, ur liver will become acclimated to it. Thus, faster elimination. Also the drug's metabolites vary in amount of time in ur system.


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