Metabolic syndrome is still a major problem in developing countries and it has an association with high blood pressure, blood glucose, and lipid profile abnormalities, which can cause cardiovascular disease. This indicates that it is important to provide adequate treatment, but patient compliance has effects on the outcome. Improving patients’ compliance to treatment can provide a better control of the condition. Therefore, this study aimed to determine the association between medication compliance and the therapeutic outcome of metabolic syndrome. This observational analytic study was conducted using a retrospective cohort design for one year of observation, namely April 2020-March 2021. The influence of patient compliance with therapy outcomes in terms of blood pressure, blood glucose, and lipid profile was assessed using the medication possession ratio method. This study was carried out by examining patients’ medical records from the Bethesda Lempuyangwangi Hospital as parameters for compliance, while the outcome parameters were assessed by experts. The data obtained were analyzed using Anova (homogeneous data) or Kruskal-Wallis (not homogeneous data) to determine the differences in the compliance based on patients’ characteristics. The relationship of adherence to therapeutic outcomes was analyzed using logistic bivariate. From 174 patients’ data that was observed, only 151 had a blood test. The average systolic blood pressure, total cholesterol, triglyceride, and HbA1c levels were above the standard threshold. The three levels of compliance had no significant relationship with blood pressure, HbA1c, and lipid profiles (p>0.05). The adjusted data for age and gender on adherence showed patients with low compliance, and they have a 2.08 times risk of having high triglyceride levels compared to others (p<0.05). The results indicated the patients’ low compliance to therapy, hence, health professionals must strengthen education to improve this condition.