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There’s Adderall IR and Adderall XR. IR is immediate release, also called short-acting, and XR is extended release or long acting. IR releases all the medication at once and last approximately 4 hours, so it’s taken 2+ times a day. XR is taken once a day and is designed to last longer.
ADDitude Community Moderator, Parenting ADHD Coach & Author, Mom to teen w/ ADHD, LDs, and autism