Why do I have to take two medications for my diabetes, namely Januvia and gliclazide? Wouldn't one be effective enough?

Taking two medications for diabetes, such as Januvia and gliclazide, is necessary because each medication works in a different way to help control blood sugar levels. Januvia helps by increasing insulin production and reducing sugar production in the liver, while gliclazide increases insulin production by the liver and enhances the action of insulin on cells. By using both medications together, their complementary actions can provide better overall control of diabetes.