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Technical Aspect of the Automated Synthesis and Real-Time Kinetic Evaluation of [11C]SNAP-7941
Published on: April 28, 2019
Pharmacokinetics of SLI381 (ADDERALL XR), an extended-release formulation of Adderall
James J McGough1, Joseph Biederman, Laurence L Greenhill
1Department of Psychiatry and Biobehavioral Sciences, Division of Child and Adolescent Psychiatry, UCLA Neuropsychiatric Institute, Los Angeles, USA. jmcgough@mednet.ucla.edu
Objective:
To assess the pharmacokinetic (PK) properties of a single daily dose of Adderall (mixed amphetamine salts) and the extended-release formulation, SLI381 (ADDERALL XR), in pediatric attention-deficit/hyperactivity disorder (ADHD).
Method:
Fifty-one children (aged 6-12 years) with ADHD participated in a 6-week, seven-visit, PK and pharmacodynamic study. PK sampling occurred during visit 1 and again at visit 7. At visit 1, subjects received an initial oral dose of SLI381, 20 mg. At visit 7 subjects completed 1 week of medication treatment following random assignment to once-daily orally dosed SLI381 10 mg, 20 mg, or 30 mg; Adderall 10 mg; or placebo.
Results:
PK parameters evidenced substantial intersubject variability (coefficients of variation = 28-56%). Time to maximum concentration (Tmax) for SLI381 versus Adderall showed average increases of 3.0 hours for dextroamphetamine (t = -2.35, p = .04, df = 8.6) and 3.2 hours for levoamphetamine (t = -2.39, p = .04, df = 9.2). The d- and l-isomer concentrations were highly correlated and approximated a 3:1 ratio.
Conclusions:
SLI381 showed extended Tmax values compared with Adderall and appears suitable for once-daily dosing. Intersubject variability underscores the need for individual dose titration.
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