Vyvanse to Adderall Conversion Guide (Dosage & Equivalency)
Since Vyvanse (lisdexamfetamine) and Adderall (amphetamine salts) work differently, there’s no exact 1:1 conversion, but doctors use general guidelines for switching medications.
Approximate Vyvanse ↔ Adderall Dosage Comparison
| Vyvanse Dose | Adderall XR Dose | Adderall IR Dose |
| 30mg Vyvanse | 10mg Adderall XR | 7.5mg Adderall IR |
| 50mg Vyvanse | 15-20mg Adderall XR | 10-15mg Adderall IR |
| 70mg Vyvanse | 20-30mg Adderall XR | 15-20mg Adderall IR |
Key Differences:
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- Vyvanse is a prodrug (must be metabolized), leading to a smoother, longer-lasting (10-14hr) effect.
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- Adderall XR lasts 8-12hrs, while Adderall IR lasts 4-6hrs (often dosed 2x/day).
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- Adderall hits faster, which can feel stronger for some people.
Importance Considerations
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- Never Self-Switch Medications – Always consult a doctor.
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- Adderall May Feel More “Intense” – Vyvanse’s gradual release often causes fewer crashes.
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- Dosing Adjustments May Be Needed – Some people need slightly higher/lower Adderall doses for the same effect.
Why Would Someone Switch?
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- Cost (Adderall is often cheaper than Vyvanse)
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- Duration (Shorter-acting Adderall IR may be preferred for flexibility)
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- Side Effects (Some tolerate one better than the other)
Final Advice
If you’re considering switching from Vyvanse to Adderall (or vice versa), work with your prescriber to find the safest, most effective dose.
Need help with ADHD meds? Ask your doctor about alternatives like Mydayis, Dexedrine, or Ritalin if neither Vyvanse nor Adderall works well for you.