Computing How Long Does Adderall Stays Detectable in Your System By Half-Life

Wondering how long does Adderall stay in your system for a drug test? This question by users who are subject to tests for their job or probation.

It comes in both immediate-release tablets or capsules and an extended-release form. There is a big difference in the time Adderall stays in your system and detectable in the urine.

The answer to this question varies for any specific individual, based primarily on body weight and the amount of Adderall. Adderall detection in body fluids is dependent principally on:

  • body weight
  • metabolization rate
  • amount ingested
  • how long taking it

There are general guidelines that will prove true most of the time. However, whether a drug test can detect this amphetamine depends on the type of test.

How long does it take to get off Adderall?

Adderall is detectable in the bloodstream for a different amount of time than it is in the urine.

Immediate release Adderall is detectable in urine for about 48 to 72 hours.

Extended-release remains in the blood for up to four days or approximately 96 hours.

Amphetamines are detectable in the urine for at least three days to 4 days (72 to 96 hours) and sometimes longer. It can vary with dosage, weight, and diet, which means a good conservative rule of thumb is detectable for up to four days. For heavy Adderall users, increase the amount of time.

Dextroamphetamine (Adderall) has a half-life of approximately 10 hours. So it means that after 10 hours. Meaning the amount of this drug in your body is half gone.


By doing the math, you can figure when it should be out of the body. For instance, if someone took 30 mg of Adderall at noon today;

– at 10 PM, there would be 15 mg in the body.


– 8:00 AM the next day, it would be down to roughly 7.5 mg

– 6:00 PM ~ 3.75 mg

Two days later

– 4:00 AM two days later, there would be about 2.0 mg

– 2:00 PM about 1 mg

– 12:00 AM .5 mg

Three days later

– 10:00 AM .25 mg

– 8:00 PM ~.125 mg

Four days later

6:00 AM ~ 0.06 mg

4:00 PM ~ 0.031 mg

Five days later

2:00 AM 0.016 mg

12:00 PM 0.007 mg

8:00 PM -gone

This example took 4/12 days to clear all the Adderall out of this person’s body.

For occasional users, blood tests usually are unable to detect amphetamines after approximately one day. But, again, it is because heavy user systems need more time to metabolize all of it.

If you are a drug addict who slipped once or took Adderall for a legitimate reason, there are ways to avoid testing positive. The best method is time. If you can schedule your drug test for a later day, you are more likely to come up clean. Also, as previously noted, if you have the option of a blood test or a urine test, the former is less likely to show amphetamine usage after a day.

Does drinking water help flush Adderall?

Amphetamines are water-soluble, which means that you can sweat much of it out of your body. So if you are concerned about a drug test, you can drink lots of water and engage in heavy physical activity. It won’t clear your system completely, but it will help speed the removal of amphetamines from your system.

While it is important not to let a single drug test ruin your life, it is also essential to be drug-free. Even if you manage to pass a drug test, if you have an Adderall addiction, you should seek assistance to end the habit as quickly as possible.

How Long Does Adderall Stay In Your System?