No, Vyvanse Chewable Tablets Cannot Be Cut in Half
The FDA label explicitly states that Vyvanse chewable tablets "must be chewed thoroughly before swallowing" and critically specifies: "Do not take anything less than one capsule or chewable tablet per day. A single dose should not be divided." 1
Why Splitting Is Prohibited
The manufacturer's instructions are unequivocal on this point for several important reasons:
- Dosing accuracy: The FDA labeling clearly prohibits dividing any Vyvanse dose, whether capsule or chewable tablet 1
- Formulation integrity: Chewable tablets are designed to be consumed as a complete unit to ensure proper drug delivery and absorption
- Abuse deterrence: Lisdexamfetamine is formulated as a prodrug that requires complete ingestion and enzymatic conversion in red blood cells to become active dexamphetamine 2. Splitting tablets could theoretically compromise this abuse-deterrent mechanism
Alternative Dosing Options
If a lower dose is needed, the appropriate approach is:
- Use a lower-strength tablet: Vyvanse chewable tablets are available in 10 mg, 20 mg, 30 mg, 40 mg, 50 mg, and 60 mg strengths 1
- Titrate by changing tablet strength: Dosing adjustments should be made in 10 mg or 20 mg increments by prescribing different tablet strengths 1
- Consider capsule formulation: If the chewable formulation presents dosing challenges, Vyvanse capsules can be opened and the entire contents mixed with yogurt, water, or orange juice, though again the entire dose must be consumed 1
Important Clinical Context
Research on tablet splitting of other medications demonstrates significant concerns about dose variability—studies show 15-24% of split tablets fall outside acceptable weight and drug content specifications 3, 4. While these studies don't specifically address Vyvanse chewables, they underscore why manufacturers prohibit splitting when precise dosing is critical, particularly for controlled substances with narrow therapeutic considerations.