This question has also been asked and answered here: How long does Adderall stay in your system?
Unfortunately... There is no exact answer to your question. In most cases, amphetamines drop below a detectable level in about 72 hours but can vary dramatically based on body weight, metabolic rate, body chemistry, water consumption (flushing), other medications taken, etc. Also, the testing method (Urine, Blood, Hair) and threshold level (the amount of the chemical in parts-per-million that triggers a positive). Sorry I can't give you a more precise answer, hope this helps.
- Adderall Information for Consumers
- Adderall Information for Healthcare Professionals (includes dosage details)
- Side Effects of Adderall (detailed)
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