Efficacy and Safety of Lisdexamfetamine for Treatment of Adults With Moderate to Severe Binge-Eating Disorder A Randomized Clinical Trial

IMPORTANCE Binge-eating disorder (BED), a public health problem associated with psychopathological symptoms and obesity and possibly with metabolic syndrome, lacks approved pharmacotherapies. OBJECTIVE To examine the efficacy and safety of lisdexamfetamine dimesylate, a dextroamphetamine prodrug, to treat moderate to severe BED. DESIGN, SETTING, AND PARTICIPANTS We performed a randomized, double-blind, parallel-group, forced dose titration, placebo-controlled clinical trial at 30 sites from May 10, 2011, through January 30, 2012. Safety and intention-to-treat analyses included 259 and 255 adults with BED, respectively. INTERVENTIONS Lisdexamfetamine dimesylate at dosages of 30, 50, or 70mg/d or placebo were provided to study participants (1: 1: 1: 1). Dosages were titrated across 3weeks and maintained for 8 weeks. We followed up participants for a mean (SD) of 7 (2) days after the last dose. MAIN OUTCOMES AND MEASURES We assessed the change in binge-eating (BE) behaviors measured as days perweek (baseline to week 11) with a mixed-effects model using transformed log (BE days perweek) + 1. Secondary measures included BE cessation for 4 weeks. Safety assessments included treatment-emergent adverse events, vital signs, and change in weight. RESULTS At week 11, log-transformed BE days perweek decreased with the 50-mg/d (least squares [LS] mean [SE] change, -1.49 [0.066]; P =.008) and 70-mg/d (LS mean [SE] change, -1.57 [0.067]; P <.001) treatment groups but not the 30-mg/d treatment group (LS mean [SE] change, -1.24 [0.067]; P =.88) compared with the placebo group. Nontransformed mean (SD) days perweek decreased for placebo and the 30-, 50-, and 70-mg/d treatment groups by -3.3 (2.04), -3.5 (1.95), -4.1 (1.52), and -4.1 (1.57), respectively. The percentage of participants achieving 4-week BE cessation was lower with the placebo group (21.3%) compared with the 50-mg/d (42.2%[P =.01]) and 70-mg/d (50.0%[P <.001]) treatment groups. The incidence of any treatment-emergent adverse events was 58.7% for the placebo group and 84.7% for the combined treatment group. In the treatment groups, 1.5% of participants had serious treatment-emergent adverse effects. Events with a frequency of at least 5% and changes in heart ratewere generally consistent with the known safety profile. The mean (SD) change in body weight was -0.1 (3.09), -3.1 (3.64), -4.9 (4.43), -4.9 (3.93), and -4.3 (4.09) kg for the placebo group, the 30-, 50-, and 70-mg/d treatment groups, and the combined treatment groups, respectively (P <.001 for each dose vs placebo group comparison in post hoc analysis). CONCLUSIONS AND RELEVANCE The 50-and 70-mg/d treatment groups demonstrated efficacy compared with the placebo group in decreased BE days, BE cessation, and global improvement. The safety profile was generally consistent with previous findings in adults with attentiondeficit/ hyperactivity disorder. Further investigation of lisdexamfetamine in BED is ongoing.