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If you are taking IR, that’s immediate release and the duration of efficacy is 4 hours. Most people who take immediate release take it 2-3 times a day. Adderall also comes in XR, a time-release formulation that is meant to last most of the day and is only taken once.
Definitely talk with your prescribing doctor about your experience so you can work together to make adjustments to make the medication more beneficial.
This article will help you understand ADHD medications better too:
ADDitude Community Moderator, Parenting ADHD Trainer & Author, Mom to teen w/ ADHD, LDs, and autism