How long do short-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.

Short-acting stimulant medications used to treat attention-deficit/hyperactivity disorder typically have effects that last about four hours. Some specific formulations, such as the instant-release version of Adderall, may have effects lasting between four and eight hours.12