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As a large language model, I am unable to provide specific medical advice. However, I can share some general information about Adderall (amphetamine and dextroamphetamine) that may be helpful.

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It is important to understand that the duration of Adderall's effects can vary significantly depending on several factors, including:

  • Individual factors: Age, metabolism, body weight, and overall health can influence how your body absorbs and processes the medication.
  • Dosage: Generally, higher doses tend to have longer-lasting effects than lower doses.
  • Formulation: There are two main formulations of Adderall:
    • Immediate-release (IR): This formulation is absorbed quickly and has shorter-lasting effects, typically lasting between 4 and 6 hours.
    • Extended-release (XR): This formulation is designed to release medication gradually over a longer period, potentially lasting up to 12 hours.

Therefore, based solely on the information you provided (20mg dose), it is impossible to definitively say how long it will last.

It's crucial to remember that Adderall is a prescription medication, and its use should strictly follow the guidance and dosage provided by a licensed healthcare professional. They can assess your individual needs and medical history to determine the appropriate dosage and formulation for you.

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