How long do long-acting ADHD stimulant medicines usually last?

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The science behind Adderall — attention-deficit/hyperactivity disorder Learn how the popular behavior-modifying amphetamine Adderall works.

Long-acting stimulant medications used to treat attention-deficit/hyperactivity disorder (ADHD) typically have effects that last between six and 12 hours.1

For specific formulations, such as the extended-release version of Adderall, the effects generally last between 10 and 12 hours. In contrast, short-acting forms of these stimulants usually last for about four hours, though some instant-release formulations may last up to eight hours.21