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Single- and Multiple-Dose Pharmacokinetics of an Oral Mixed Amphetamine Salts Extended-Release Formulation in Adults

Published online by Cambridge University Press:  07 November 2014

Susan B. Clausen ,
Stephanie C. Read  and
Simon J. Tulloch
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Abstract

Objectives: Assess the bioavailability of mixed amphetamine salts extended-release (MAS XR) 30-mg capsules and the dose proportionality of pharmacokinetic measures for MAS XR 20,40, and 60 mg.

Methods: Study A, an open-label single-period study, and Study B, a randomized, open-label, three threeway crossover study, were conducted in healthy adults in a clinical research unit. In Study A, 20 subjects received a single MAS XR 30-mg capsule by mouth daily for 7 days. In Study B, 12 subjects received single oral doses of MAS XR 20,40, and 60 mg separated by 7-14-day washout periods.

Findings: Plasma dextroamphetamine (D-amphetamine) and levoamphetamine (L-amphetamine) concentrations were measured using a validated LC-MS/MS method. In Study A, a 3:1 ratio of D-amphetamine to L-amphetamine was observed for AUC0-∞ and Cmax. Tmax was 4.2 and 4.3 hours for D-amphetamine to Lamphetamine, respectively. In Study B, for D- and Lamphetamine, statistically significant differences were observed for AUC0-t, AVC0-∞, and Cmax between all doses; there was a linear relationship between pharmacokinetic variables and dose and Tmax was similar for each isomer (range: 4.5–5.3 hours) with all given MAS XR doses.

Conclusion: The extent of exposure as assessed by mean AUC0-24 and Cmax reflected the 3:1 ratio of D-amphetamine to L-amphetamine in MAS XR 30-mg capsules. The pharmacokinetic profiles of MAS XR 20, 40, and 60 mg are dose proportional for the isomers.

Type
Academic Supplement
Information
CNS Spectrums , Volume 10 , Issue S20: Mixed Amphetamine Salts Extended Release for the Treatment of ADHD in Adults: Current Evidence , December 2005 , pp. 6 - 15
Copyright
Copyright © Cambridge University Press 2005

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