The study was conducted in an inpatient setting, with the dosage of olanzapine remaining consistent throughout the study duration. All participants were administered 1500 mg/day of metformin for eight weeks. Vital signs were measured daily. Physical and neurological examinations were carried out on a weekly basis. Every two weeks, all participants underwent an assessment for general psychopathology. Blood samples were collected in the morning after an overnight fast at the beginning of the study and then every two weeks following the commencement of metformin treatment. Serum prolactin levels were determined through electrochemiluminescence immunoassays. Fasting serum levels of glucose, total cholesterol, high-density lipoprotein cholesterol (HDL-C), low-density lipoprotein cholesterol (LDL-C), and triglycerides were measured using enzymatic colorimetric assays. Serum insulin and leptin levels were measured using electrochemiluminescence immunoassay kits.
