Single- and Multiple-Dose Pharmacokinetics of an Oral Mixed Amphetamine Salts Extended-Release Formulation in Adults
| Autor: | Susan B. Clausen, Simon J. Tulloch, Stephanie C Read |
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| Rok vydání: | 2005 |
| Předmět: | |
| Zdroj: | CNS Spectrums. 10:6-15 |
| ISSN: | 2165-6509 1092-8529 |
| DOI: | 10.1017/s109285290000239x |
| Popis: | 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. Tmaxwas 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 Cmaxbetween all doses; there was a linear relationship between pharmacokinetic variables and dose and Tmaxwas 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 AUC0-24and Cmaxreflected 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. |
| Databáze: | OpenAIRE |
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