Direct Dose Equivalency: Concerta 36mg to Vyvanse
There is no established direct dose equivalency between Concerta (methylphenidate) 36mg and Vyvanse (lisdexamfetamine), and these medications should not be converted using a simple mathematical formula. 1
Why Direct Conversion Is Not Recommended
These are fundamentally different stimulant classes with distinct pharmacological properties:
- Concerta (methylphenidate): Blocks dopamine and norepinephrine reuptake
- Vyvanse (lisdexamfetamine): A prodrug converted to dextroamphetamine, which causes direct release of dopamine and norepinephrine from presynaptic terminals
The FDA labeling for Concerta explicitly states that conversion from other methylphenidate regimens requires "clinical judgment" rather than fixed ratios 1. This principle applies even more strongly when switching between different stimulant classes.
Practical Switching Approach
When switching from Concerta 36mg to Vyvanse, start with Vyvanse 30mg once daily in the morning 2. This represents a conservative starting approach that prioritizes safety.
Rationale for this approach:
- Vyvanse starting doses range from 20-30mg for treatment-naive patients 2
- Concerta 36mg represents a moderate methylphenidate dose (equivalent to 10mg methylphenidate three times daily) 1
- Starting at 30mg Vyvanse allows for upward titration in 10mg weekly increments to a maximum of 70mg 2
Titration Strategy:
- Week 1: Start Vyvanse 30mg once daily in the morning
- Week 2-6: Increase by 10mg weekly increments based on symptom response and tolerability
- Target range: Most patients respond between 30-70mg daily
- Monitor: ADHD symptoms, side effects (appetite suppression, insomnia, irritability, cardiovascular parameters)
Critical Caveats
Individual response is highly variable and unpredictable 3. Research demonstrates that approximately 70% of patients respond to methylphenidate, while nearly 90% respond to at least one stimulant when both methylphenidate and amphetamine classes are tried 4, 3. This means some patients who respond well to Concerta may not respond optimally to Vyvanse, and vice versa.
The 12-hour duration of both medications does not mean equivalent dosing 4, 5. Concerta uses an osmotic release system creating an ascending plasma level, while Vyvanse is a prodrug with slow onset and sustained release 4, 5.
Monitoring Requirements
After switching, assess weekly during titration for:
- Efficacy: ADHD symptom control using standardized rating scales
- Safety: Blood pressure, pulse, weight, sleep quality, appetite, mood changes
- Tolerability: Agitation, insomnia, decreased appetite (most common side effects) 6
If inadequate response occurs after reaching Vyvanse 70mg with appropriate trial duration, consider switching back to methylphenidate or trying alternative ADHD medications 7.