From my experience with any of the stimulants that I've tried for Adult ADHD, including Adderall, its an instant acting medication (unless it is administered in extended release form), which means that it doesn't take weeks to reach therapeutic levels in the blood. It is immediately absorbed by the blood and begins to work. So, one should feel it beginning to work anywhere from 10 minutes to about an hour, depending on if the person has had anything to eat, less than regular amount of sleep, emotional distress, and any other factors that may contribute to how quickly it affects one. Same with leaving your system; it has a relatively quick half-life, much like any stimulant medications. Good luck! Hope that helps.
- Adderall Information for Consumers
- Adderall Information for Healthcare Professionals (includes dosage details)
- Side Effects of Adderall (detailed)
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