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Effect of GLP-1 Receptor Agonist Treatment on Body weight in Obese Antipsychotic-treated Patients with Schizophrenia: a Randomized, Placebo-controlled Trial Byline

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AIMS: Schizophrenia is associated with cardiovascular co-morbidity and a reduced life-expectancy of up to 20 years. Antipsychotics are dopamine D2 receptor antagonists and the standard of medical care in schizophrenia, but the drugs are associated with severe metabolic side effects like obesity and diabetes. Glucagon-like peptide-1 receptor agonists (GLP-1RAs) are registered for treatment of both obesity and type 2 diabetes. We investigated metabolic effects of the GLP-1RA, exenatide once-weekly, in non-diabetic, antipsychotic-treated, obese patients with schizophrenia.

MATERIAL AND METHODS: Antipsychotic-treated, obese, non-diabetic, schizophrenia spectrum patients were randomized to double-blinded adjunctive treatment with once-weekly subcutaneous exenatide (n = 23) or placebo (n = 22) injections for three months. The primary outcome was body weight loss after treatment and repeated measures analysis of variance was used as statistical analysis.

RESULTS: Between March 2013 and June 2015, 40 patients completed the trial. At baseline, the mean body weight was 118.3 ± 16.0 kg in the exenatide group and 111.7 ± 18.0 kg in the placebo group, with no group differences (P = 0.23). The exenatide and placebo groups experienced significant (P = 0.004), however, similar (P = 0.98) weight losses of 2.24 ± 3.3 kg and 2.23 ± 4.4 kg, respectively, after three months of treatment.

CONCLUSIONS: Treatment with exenatide once-weekly did not promote weight loss in obese, antipsychotic-treated patients with schizophrenia compared to placebo. Our results could suggest that the body weight-lowering effect of GLP-1RAs involves dopaminergic signaling, but blockade of other receptor systems may also play a role. Nevertheless, anti-obesity regimens effective in the general population may not be readily implemented in antipsychotic-treated patients with schizophrenia identifier: NCT01794429.

TidsskriftDiabetes, Obesity and Metabolism
Udgave nummer2
Sider (fra-til)162-171
StatusUdgivet - 2017

ID: 49206604