What is the dose equivalent of Adderall immediate-release 30 mg daily to Vyvanse (lisdexamfetamine)?

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Dose Conversion: Adderall IR 30mg Daily to Vyvanse

When converting from Adderall IR 30mg daily to Vyvanse (lisdexamfetamine), start with Vyvanse 50mg once daily in the morning.

Conversion Rationale

The conversion is based on the pharmacokinetic relationship between these amphetamine formulations. Vyvanse is a prodrug that is converted to dextroamphetamine in the blood 1. Adderall IR contains mixed amphetamine salts (75% dextroamphetamine and 25% levoamphetamine), while Vyvanse delivers only dextroamphetamine after conversion.

Key Conversion Principles:

  • Adderall IR 30mg daily contains approximately 22.5mg of dextroamphetamine (75% of the total amphetamine content)
  • Vyvanse 50mg releases approximately 14.5mg of dextroamphetamine (based on the molecular weight conversion where 50mg lisdexamfetamine dimesylate equals 28.9mg lisdexamfetamine base) 1
  • The typical conversion ratio is approximately 1.5:1 to 2:1 (Vyvanse to Adderall IR)

Titration Strategy After Conversion

After initiating Vyvanse 50mg, titrate based on symptom control and tolerability:

  • If inadequate response: Increase to Vyvanse 60mg or 70mg (maximum FDA-approved dose) 1
  • If intolerable side effects: Reduce to Vyvanse 40mg or 30mg
  • Assess response weekly during the initial titration phase 2

The dose-response relationship for lisdexamfetamine shows continued efficacy improvements up to 70mg daily, with higher doses providing greater ADHD symptom reduction 3. However, individual patients may achieve optimal response at lower doses with better tolerability.

Important Clinical Considerations

Duration of action differences: Vyvanse provides approximately 13-14 hours of symptom control 4, compared to Adderall IR's 4-6 hours per dose. This means the patient will transition from multiple daily doses to once-daily dosing with extended coverage.

Monitoring requirements:

  • Assess blood pressure and pulse at follow-up visits 2
  • Monitor weight and appetite, as decreased appetite is common 5
  • Evaluate ADHD symptom control using standardized rating scales 2

Common pitfalls to avoid:

  • Do not assume a simple 1:1 conversion exists between these medications
  • Do not start at Vyvanse 30mg if the patient was stable on Adderall IR 30mg, as this will likely be subtherapeutic
  • Remember that Vyvanse cannot be split or crushed for dose adjustment; only use available capsule strengths (10,20,30,40,50,60, 70mg) 1

Side effect profile: Expect similar amphetamine-related adverse effects including decreased appetite, insomnia, increased blood pressure, and headaches 5, 6. The prodrug formulation does not eliminate these effects but may provide smoother delivery throughout the day.

References

2
Guideline

practice parameter for the use of stimulant medications in the treatment of children, adolescents, and adults.

Journal of the American Academy of Child and Adolescent Psychiatry, 2002

6
Research

Amphetamines for attention deficit hyperactivity disorder (ADHD) in adults.

The Cochrane database of systematic reviews, 2018

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This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.