Pengaruh pemberian ekstrak herba daun sendok (Plantago major) terhadap kadar glukosa darah mencit Balb/C induksi streptozotocin . This research aimed to determine the effect of daun sendok (Plantago major L.) extract on the blood glucose level of Balb/C mice induced by streptozotocin. This study was a laboratory experimental pre and post-test control group design. The subjects used were 16 male mice. Then, mice were induced with streptozotocin by a dose of 65 mg/kg body weight intraperitoneally freshly dissolved in 0.02 M citrate saline buffer. Mice used were mice with blood glucose levels ≥200 mg/dL. Furthermore, mice were divided into 2 groups by a simple random sampling. Group 1 was given metformin in a dose of 1.3 mg/mice/day and group 2 was given daun sendok extract in a dose of 1000 mg/kg body weight/day. At the 2 nd week, it was measured for the glucose levels from the blood of mice tail by a Blood Glucose Stick Meter (Gluco DrTM). The data obtained were statistically analyzed by independent samples t-test by using SPSS Programme for Microsoft Windows release 17.0. The significance was set at p<0.05. The difference of average blood glucose levels pre vs post experiment, metformin group was -145.87 mg/dL and daun sendok group was -85.00 mg/dL (p=0.024). The experiment results showed that daun sendok extract in a dose of 1000 mg/kg body weight/day could reduce the blood glucose levels in Balb/C mice induced by streptozotocin.