Vyvanse Starting Dose When Switching from Adderall XR 10mg
Start Vyvanse at 30 mg once daily in the morning for this 8-year-old patient switching from Adderall XR 10mg. 1
Rationale for 30mg Starting Dose
The FDA-approved starting dose of Vyvanse for pediatric patients 6 years and older with ADHD is 30 mg once daily, regardless of prior stimulant exposure 1. This represents the standard initial dose rather than a direct conversion calculation, as lisdexamfetamine (Vyvanse) and mixed amphetamine salts (Adderall) are not dosed equivalently on a milligram-per-milligram basis 2, 3.
- The 30 mg starting dose applies universally to treatment-naive patients and those switching from other stimulants 4, 1
- Lisdexamfetamine is a prodrug that requires enzymatic conversion to active dextroamphetamine in the gastrointestinal tract, creating different pharmacokinetic properties than Adderall XR 2, 3
Titration Protocol After Initiation
After starting at 30 mg, the dose may be adjusted in increments of 10 mg or 20 mg at approximately weekly intervals based on symptom control and tolerability 1:
- Maximum dose: 70 mg once daily 4, 1
- Obtain standardized ADHD rating scales from parents and teachers before each dose increase 4
- Monitor vital signs (blood pressure and pulse) at every visit 4
- Assess both therapeutic effects and side effects systematically at each dose level 4
Administration Considerations
- Timing: Administer once daily in the morning with or without food 1
- Avoid afternoon doses due to insomnia risk 1
- The capsule may be swallowed whole or opened and mixed with yogurt, water, or orange juice if the child has difficulty swallowing 1
Monitoring During the Switch
Document baseline measurements before initiating Vyvanse 4:
- Height and weight for ongoing growth monitoring 4
- Blood pressure and pulse 4
- Cardiac history including family history of sudden death, ventricular arrhythmia, or structural heart disease 4, 1
Common Pitfalls to Avoid
- Do not attempt direct dose conversion: There is no established conversion ratio between Adderall XR and Vyvanse 2, 3
- Do not start below 30 mg: The FDA label does not recommend starting doses lower than 30 mg for ADHD treatment 1
- Do not divide capsules: A single dose should not be divided; the minimum dose is one full capsule 1
- Do not assume immediate equivalence: The patient may require titration to find the optimal Vyvanse dose even though they responded to Adderall XR 10mg 3
Expected Side Effect Profile
The most common adverse events with Vyvanse are typical of amphetamine products 3:
- Decreased appetite
- Insomnia
- Upper abdominal pain
- Headache
- Irritability
- Weight loss
These side effects should be systematically assessed at each follow-up visit during dose titration 4.