Can a patient with ADHD, autism, and hypertension controlled with an angiotensin‑converting enzyme inhibitor who is taking dexedrine (dextroamphetamine) twice daily and clonidine be switched to vyvanse (lisdexamfetamine) once daily?

Medical Advisory BoardAll articles are reviewed for accuracy by our Medical Advisory Board
Educational purpose only • Exercise caution as content is pending human review
Article Review Status
Submitted
Under Review
Approved

Last updated: September 30, 2026 • View editorial policy

Have a follow-up question?

Our Medical A.I. is used by practicing medical doctors at top research institutions around the world. Ask any follow up question and get world-class guideline-backed answers instantly.

Ask Question

Yes, switching from Dexedrine BID to Vyvanse once daily is feasible and appropriate for this patient with ADHD, autism, and controlled hypertension.

Both dexedroamphetamine (Dexedrine) and lisdexamfetamine (Vyvanse) are amphetamine-based stimulants with similar mechanisms of action, making this a straightforward within-family medication switch rather than a change to a different stimulant class 1, 2.

Rationale for the Switch

Vyvanse is essentially a prodrug of dextroamphetamine – it is enzymatically converted to d-amphetamine in the blood by red blood cells 2. This means your client would be receiving the same active medication (dextroamphetamine) but with a smoother, longer-lasting delivery system. The once-daily dosing of Vyvanse provides 10-13 hours of symptom control compared to the shorter duration of immediate-release Dexedrine, which typically requires multiple daily doses 3.

Cardiovascular Considerations with Hypertension

The cardiovascular profile is similar between these two amphetamine formulations. Both cause modest increases in blood pressure and heart rate 1. Studies show amphetamines increase systolic BP by approximately 5.4 mm Hg and heart rate by 7.3 beats per minute on average 4. Since his hypertension is already controlled with an ACEI, and he's tolerating Dexedrine without apparent cardiovascular issues, switching to Vyvanse should not pose additional cardiovascular risk 5, 6.

Monitor blood pressure and pulse at baseline and periodically during treatment – this is standard practice for all stimulants 1, 5. The 2019 AAP guidelines recommend checking vital signs but note that stimulant-associated BP/HR increases are typically mild and clinically insignificant in most patients 5.

Autism Comorbidity

Stimulants remain effective in patients with both ADHD and autism, though this population may experience slightly higher rates of adverse effects 7. The meta-analysis by 7 found methylphenidate and amphetamines effective for hyperactivity and inattention symptoms in ASD patients, though dropout rates due to side effects were higher. Since your client is already tolerating Dexedrine, switching to Vyvanse (same active ingredient) should maintain efficacy with similar tolerability.

Role of Clonidine

Continue the clonidine – it serves multiple beneficial functions in this case 1:

  • Provides "around-the-clock" ADHD symptom control
  • May help mitigate stimulant-induced cardiovascular effects (elevated BP/HR) 1
  • Can address sleep disturbances if present 1
  • Has FDA approval as adjunctive therapy to stimulants 1

The combination of a stimulant plus clonidine is evidence-based and may actually provide superior symptom control while potentially reducing stimulant-related side effects 1.

Conversion Dosing

Use a 1:1 mg conversion from total daily Dexedrine to Vyvanse, though Vyvanse doses are expressed as lisdexamfetamine dimesylate (the prodrug) rather than pure dextroamphetamine content 2:

  • If taking Dexedrine 10 mg BID (20 mg/day total) → Start Vyvanse 30 mg once daily
  • If taking Dexedrine 15 mg BID (30 mg/day total) → Start Vyvanse 50 mg once daily
  • If taking Dexedrine 20 mg BID (40 mg/day total) → Start Vyvanse 70 mg once daily

The FDA label indicates Vyvanse is available in 10,20,30,40,50,60, and 70 mg strengths 2. Start with the closest equivalent dose and titrate based on response.

Practical Switching Strategy

Direct switch is appropriate – no tapering or washout period is needed since both medications contain the same active moiety 8. Simply discontinue Dexedrine and start Vyvanse the next morning. The patient should take Vyvanse once daily in the morning 2.

Common Pitfalls to Avoid

  • Don't underdose: Vyvanse doses appear numerically higher than Dexedrine doses, but remember Vyvanse is dosed as the prodrug (lisdexamfetamine dimesylate), not pure dextroamphetamine
  • Don't abruptly discontinue clonidine: This can cause rebound hypertension 5. Keep the clonidine regimen stable during the stimulant switch
  • Monitor adherence: Once-daily dosing typically improves adherence compared to BID regimens 1

Expected Benefits

  • Simplified once-daily dosing improving adherence
  • Smoother symptom control throughout the day without the peaks/troughs of immediate-release formulations
  • Reduced potential for afternoon "rebound" symptoms 1
  • Lower abuse potential compared to immediate-release amphetamines (though still a controlled substance) 6

References

Related Questions

What is the appropriate method to transition a patient on Adderall (mixed amphetamine salts) 30 mg immediate‑release twice daily to Vyvanse (lisdexamfetamine)?
How should a patient with ADHD who is currently taking Adderall (amphetamine/dextroamphetamine) 60 mg daily and modafinil 400 mg be transitioned to Vyvanse (lisdexamfetamine)?
Are aphthous ulcers associated with the use of Vyvanse (lisdexamfetamine)?
I’m an adult on Vyvanse 30 mg for ADHD and want to switch to amphetamine (Adderall); should I use Adderall extended‑release (XR) or immediate‑release (IR), and what dose would be equivalent?
Is it safe to take an additional dose of Vyvanse (lisdexamfetamine) in the afternoon as a booster if the morning dose causes a crash by early afternoon?
How should a 9-year-old child with diffuse body aches and normal laboratory studies, including normal creatine kinase, be evaluated and managed?
Are any of these tumor markers (CA‑125, CA‑15‑3, carcinoembryonic antigen) indicated for screening asymptomatic individuals?
What are the indications for laparoscopic-assisted pull-through?
In a 37-year-old woman with Hemoglobin A1c 8.7% and fasting blood glucose 12 mmol/L, what medication should be initiated?
For a patient with left foot pain and swelling after a roll injury, with an initially normal foot and ankle radiograph but persistent pain and bruising two weeks later, should I repeat the plain radiograph, obtain an MRI, or refer to orthopedics?
Can Prolia (denosumab) cause tooth loss?

Professional Medical Disclaimer

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.