Metformin doesn’t affect your kidneys. It doesn’t give you kidney problems or make kidney problems worse.

If you already have kidney problems, metformin can increase your risk of getting a very rare problem called lactic acidosis. It happens in about 5 out of every 100,000 people taking metformin.

If you take metformin, your doctor will probably have you take some tests every few months to check on how your kidneys are doing. If your kidneys aren’t doing well, your doctor may lower your dose, or they may have you stop taking metformin.

Talk to your doctor if you have kidney problems and take metformin. They can help you decide if metformin is the right choice for you.

When it comes to your kidneys, here’s what to expect: metformin doesn’t have an effect