Vyvanse Travel & Timezone-Shift Protocols: A Clinical Guide for Patients and Prescribers

What the label says about dose timing

The label's timing instruction is direct: take Vyvanse orally in the morning, with or without food, and avoid afternoon doses because of the potential for insomnia [1].

ADHD treatment in adults and children 6 and older starts at 30 mg once daily in the morning and is adjusted in 10 mg or 20 mg steps at about weekly intervals to 30 to 70 mg per day, maximum 70 mg [1]. In adults with moderate to severe binge eating disorder, dosing starts at 30 mg and titrates by 20 mg at about weekly intervals to a target of 50 to 70 mg per day, maximum 70 mg, and the label says to discontinue if binge eating does not improve [1].

The label also states that a single dose should not be divided, and that nothing less than one capsule or tablet is taken [1].

How long a dose lasts

After a capsule, lisdexamfetamine peaks at about 1 hour and dextroamphetamine at about 3.5 hours in fasted children aged 6 to 12 [1]. Lisdexamfetamine is an inactive prodrug converted to dextroamphetamine mainly in blood by red blood cells, not by cytochrome P450 enzymes [1]. Its own half-life averages under 1 hour; dextroamphetamine's is about 10 to 11.3 hours in healthy adults and 8.6 to 9.5 hours in children aged 6 to 12 [1].

In a laboratory school study, children aged 6 to 12 with ADHD first had open-label dose optimization, and 117 were then randomized to a placebo-controlled, two-way crossover [2]. Vyvanse performed better than placebo on the SKAMP deportment and attention scales and the PERMP at each measured time point, from 1.5 hours to the last assessment at 13 hours (P < .005) [2]. That result comes from children during a supervised school day, and the study did not test adults or shifted dosing times.

What the label says about handling and interactions

Vyvanse carries a boxed warning for abuse, misuse and addiction, which can lead to a substance use disorder and to overdose and death, and the label directs that patients and families be educated about those risks, about proper storage and about disposal of unused drug [1]. The label also advises storing Vyvanse in a safe place, preferably locked, and says patients should not give it to anyone else [1].

Capsules can be swallowed whole, or opened and the entire contents mixed with yogurt, water or orange juice and taken immediately; the mixture is not to be stored [1]. Chewable tablets must be chewed thoroughly, and capsules and chewable tablets can be substituted mg for mg [1].

Two other label points affect amphetamine levels. Alkalinizing agents such as sodium bicarbonate raise amphetamine blood levels and the label says co-administration should be avoided; acidifying agents such as ascorbic acid lower levels and efficacy, and the label says to increase the dose based on clinical response [1]. Food delayed the peak dextroamphetamine concentration by about 1 hour without changing total exposure or peak concentration [1].

Athletes: a separate rule from Schedule II

Lisdexamfetamine is named in class S6.A (non-specified stimulants) of the WADA 2026 Prohibited List and is prohibited in-competition; amfetamine is named in the same class [3]. A prescription needs a Therapeutic Use Exemption in WADA-governed sport [3]. The 2027 List, in force from 1 January 2027, still names lisdexamfetamine in S6.A [4].