Metformin is in medicines many people take for type 2 diabetes. It helps lower your blood glucose and makes your body more sensitive to insulin, but it can also cause nausea and diarrhea when you first start taking it or raise the dose. Those side effects usually go away in a few weeks.
This drug helps people with type 2 diabetes and prediabetes bring down their blood sugar level in three ways:
- It tells your liver to make less glucose.
- It lowers your insulin resistance, which means it makes your muscles use insulin better so glucose can get into them instead of staying in your blood.
- It helps your intestines absorb less glucose from your food.
It can lower your A1c, the "average" of your blood sugar control over a few months. It can also delay prediabetes becoming diabetes.