evaluation of the effect of barberry root (berberis vulgaris) on the prevention of metabolic syndrome caused by atypical antipsychotic drugs in patients with schizophrenia: a three-blind placebo-controlled clinical trial

Objective: metabolic syndrome is a potential side effect of atypical antipsychotics which are the current standard treatment for schizophrenia. therefore, we aimed to examine the effect of barberry root (berberis vulgaris) on the prevention of metabolic syndrome caused by atypical antipsychotic drugs in patients with schizophrenia.method: our research was a three-blind randomized clinical trial. the participants included all patients who were diagnosed with schizophrenia through the scid-5 questionnaire and based on the dsm-5-tr criteria by two psychiatric experts. these patients were randomly divided into intervention and placebo groups. during a three-month treatment period, the intervention group received three 500 mg capsules of barberry root extract daily, whereas the placebo group received the same capsules containing 500 mg of starch powder. metabolic syndrome variables including fasting blood glucose, serum lipids (triglyceride and cholesterol), blood pressure, weight and waist circumference were measured before and after the treatment as outcome measure. chi-square and t-tests were used for data analysis using spss-22 software.results: at the beginning of the study, there was no significant difference between the intervention group (n = 41) and the placebo group (n = 47) in terms of demographic factors, and pre-treatment assessments including weight, waist size, fasting blood hdl, fasting blood triglycerides and systolic and diastolic blood pressure and fasting blood glucose (p>0.05). within group analysis showed that some metabolic factors significantly increased in both groups after the treatment (p<0.05). indeed, in both groups, metabolic syndrome measures worsened after the three-month treatment period. the parameters of weight and waist size were significantly higher in the intervention group than the placebo group after treatment (p<0.05).conclusion: barberry root extract was not able to control the effects of antipsychotic drugs on metabolic syndrome in schizophrenia.