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The active ingredient in generic Adderall is amphetamine salts, which is a combination of dextroamphetamine and levoamphetamine.
Think of dextroamphetamine and levoamphetamine as right- and left-handed versions of each other. They have the same, mirrored shape, like a left and right hand, but are not exact copies.
Adderall can be prescribed in both immediate-release (IR) and extended-release (XR) formulations. Both formulations treat the same conditions, but the XR versions are more convenient because they can be taken once a day. IR formulations last between four to six hours and sometimes need to be taken more than once each day.