Naltrexone/Bupropion extended release-induced weight loss is independent of nausea in subjects without diabetes.
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Naltrexone/bupropion extended release (NB) is indicated as an adjunct to a reduced-calorie diet and increased physical activity for chronic weight management in adults with an initial body mass index of ≥30 or ≥27 kg m(-2) and ≥1 weight-related comorbidity (e.g. hypertension, type 2 diabetes and dyslipidaemia). In phase 3 clinical studies, nausea occurred in significantly higher proportions of subjects randomized to NB vs. placebo (PBO). In this pooled analysis of three phase 3, 56-week, PBO-controlled studies, we characterized nausea and weight loss in NB- and PBO-treated subjects without diabetes. Subjects receiving NB (n = 1778) lost significantly more weight than those receiving PBO (n = 1160). Weight change was not significantly different between subjects reporting and not reporting nausea in either treatment arm. Severity of nausea was mild to moderate in ≥95% of all cases. In the NB arm, the highest incidence of nausea onset (9%) was reported during week 1. The median duration of mild, moderate and severe nausea in subjects receiving NB was 14, 9 and 13 days, respectively. Our results demonstrate that nausea associated with NB is rarely severe, primarily occurs early in treatment and is not a contributor to weight loss.