Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/57765
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Type: Journal article
Title: Randomized controlled trial of dexamphetamine maintenance for the treatment of methamphetamine dependence
Author: Longo, M.
Wickes, W.
Smout, M.
Harrison, S.
Cahill, S.
White, J.
Citation: Addiction, 2009; 105(1):146-154
Publisher: Blackwell Publishing Ltd
Issue Date: 2009
ISSN: 0965-2140
1360-0443
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Responsibility: 
Marie Longo, Wendy Wickes, Matthew Smout, Sonia Harrison, Sharon Cahill & Jason M. White
Abstract: AIM: To investigate the safety and efficacy of once-daily supervised oral administration of sustained-release dexamphetamine in people dependent on methamphetamine. DESIGN: Randomized, double-blind, placebo-controlled trial. PARTICIPANTS: Forty-nine methamphetamine-dependent drug users from Drug and Alcohol Services South Australia (DASSA) clinics. INTERVENTION: Participants were assigned randomly to receive up to 110 mg/day sustained-release dexamphetamine (n = 23) or placebo (n = 26) for a maximum of 12 weeks, with gradual reduction of the study medication over an additional 4 weeks. Medication was taken daily under pharmacist supervision. MEASUREMENTS: Primary outcome measures included treatment retention, measures of methamphetamine consumption (self-report and hair analysis), degree of methamphetamine dependence and severity of methamphetamine withdrawal. Hair samples were analysed for methamphetamine using liquid chromatography-mass spectrometry. FINDINGS: Treatment retention was significantly different between groups, with those who received dexamphetamine remaining in treatment for an average of 86.3 days compared with 48.6 days for those receiving placebo (P = 0.014). There were significant reductions in self-reported methamphetamine use between baseline and follow-up within each group (P < 0.0001), with a trend to a greater reduction among the dexamphetamine group (P = 0.086). Based on hair analysis, there was a significant decrease in methamphetamine concentration for both groups (P < 0.0001). At follow-up, degree of methamphetamine dependence was significantly lower in the dexamphetamine group (P = 0.042). Dexamphetamine maintenance was not associated with serious adverse events. CONCLUSIONS: The results of this preliminary study have demonstrated that a maintenance pharmacotherapy programme of daily sustained-release amphetamine dispensing under pharmacist supervision is both feasible and safe. The increased retention in the dexamphetamine group, together with the general decreases in methamphetamine use, degree of dependence and withdrawal symptom severity, provide preliminary evidence that this may be an efficacious treatment option for methamphetamine dependence.
Keywords: Dependence; dexamphetamine; maintenance; methamphetamine; pharmacotherapy; randomized controlled trial; treatment
Description: Published Online: 19 Oct 2009 © 2009 The Authors. Journal compilation © 2009 Society for the Study of Addiction
RMID: 0020100032
DOI: 10.1111/j.1360-0443.2009.02717
Appears in Collections:Pharmacology publications

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