To determine whether amphetamine extended-release oralsuspension (AMPH EROS) has an onset of effect at 30minutes postdose inchildren with ADHD.

This randomized, double-blind, 2-treatment, 2-sequence, placebo-controlled crossover pilot study enrolled subjects aged 6 to 12 years withattention-deficit/hyperactivity disorder (ADHD) and ADHD-Rating Scale-5 scores of ≥90th percentile for sex and age. A dose of 5 to 20mg/day of AMPH EROS was determined during a 1-week open-label phase based on medication history, symptom control, and tolerability. Subjects completed a practice laboratory classroom then received one day of double-blind active drug or placebo each in random sequence during 2 double-blind laboratory classroom days. Subjects completed the first double-blind laboratory classroom session, returned to open label drug for 5days then crossed over on day 6 during a second double-blind laboratory classroom session. DB dose was fixed at AMPH EROS 15, 17.5, or 20mg . The primary endpoint was change from predose in the Swanson, Kotkin, Agler, M-Flynn, Pelham rating scale-combined score (SKAMP-C) at 30minutes postdose on two DB days. The key secondary endpoint was change from predose in the SKAMP-C score at 3hours postdose for AMPH EROS compared with placebo. Safety assessments included vital signs and adverse events.

Eighteen subjects were enrolled in the study (14 males and 4 females) with a mean age of 9 years. At both 30minutes and 3hours postdose, changes from baseline in SKAMP-C for AMPH EROS vs. placebo were statistically significant (p<0.01 and p=0.0002, respectively) with corresponding effect sizes of 0.96 and 1.57. Adverse events (>10%) during the open-label phase included upper respiratory tract infection, fatigue, upper abdominal pain, headache, decreased appetite, and affect lability.

AMPH EROS was effective in reducing ADHD symptoms at 30minutes postdose. AEs were mild or moderate and consistent with those of other extended-release amphetamines.

Funding Acknowledgements: Support was provided by Tris Pharma, Inc.