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The two main alternatives for Adderall are an immediate-release (IR) tablet and an extended-release (Adderall XR) capsule. When medicine is described as having an immediate release, it enters your body immediately after you take a dose. The extended-release refers to the way the medication enters your body slowly.
An oral tablet that is in immediate-release (IR) drug form.
Adderall XR (oral capsule) is an Extended-release (ER) drug form.