Objective: To determine whether physical dependence developed during lisdexamfetamine dimesylate treatment, as evidenced by presence of withdrawal symptoms after treatment cessation in adults with binge-eating disorder (BED) treated for up to 38 weeks.
Methods: Three studies enrolled adults with DSM-IV-TR-defined BED. In two 12-week, randomized, double-blind, placebo-controlled studies conducted from November 2012 to September 2013, participants were treated with placebo or dose-optimized lisdexamfetamine (50 or 70 mg). In a double-blind, placebo-controlled, randomized-withdrawal maintenance-of-efficacy study conducted from January 2014 to April 2015, participants categorized as responders after 12 weeks of open-label lisdexamfetamine (50 or 70 mg) were randomized to continued lisdexamfetamine or placebo for 26 weeks. The Amphetamine Cessation Symptom Assessment (ACSA), a 16-item self-report instrument (total score: 0-64), assessed withdrawal experiences. Mean ± SD ACSA scores and medians are presented for study completers.
Results: In the short-term efficacy studies, mean ± SD ACSA aggregate scores for placebo and lisdexamfetamine (pooled data) were 7.0 ± 7.60 (n = 275) and 4.9 ± 6.41 (n = 271), respectively, on the day of the last dose at week 12/early termination (ET) and 4.8 ± 6.82 (n = 234) and 5.5 ± 7.50 (n = 221) on day 7 after the last dose. In the maintenance-of-efficacy study, mean ± SD ACSA aggregate scores for placebo and lisdexamfetamine were 4.8 ± 6.67 (n = 44) and 4.7 ± 7.78 (n = 85) on the day of the last dose at week 38/ET and 3.9 ± 5.75 (n = 37) and 5.2 ± 7.93 (n = 71) on day 7 after the last dose.
Conclusions: Study results suggest that abrupt lisdexamfetamine termination was not associated with amphetamine withdrawal symptoms at the exposure durations and therapeutic doses analyzed.
Trial Registration: Clinicaltrials.gov identifiers: NCT01718483, NCT01718509, and NCT02009163.
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