The guide

Should I take metformin? Diabetes medicines, the case for and against

By GyroscopeUpdated November 15, 20266 sources

Any decision to start, change or stop a medicine belongs to you and your prescriber. This page lays out the case for and against so you can have that conversation well. It isn’t medical advice.

For prediabetes, metformin works, but lifestyle worked better. In the biggest trial, metformin cut new cases of diabetes by 31% and the lifestyle program by 58%, and the ADA’s 2026 standards say metformin should be considered for some higher-risk groups. For type 2 diabetes, the same standards say medicine should start at diagnosis, and which one depends on your heart, kidneys and weight. Here’s the fair case on each side, and the questions to take to your doctor.

Why people dread this conversation

Some people feel a prescription is a verdict, proof they failed at lifestyle. Others want the pill so they can skip the walking. And a lot of people don’t know what the options are, so they nod along.

The guidelines treat it differently. Medicine and lifestyle aren’t rivals. The question is what each one adds at your stage.

Metformin for prediabetes

Medicines for type 2 diabetes

Once type 2 is confirmed, the ADA’s 2026 standards say “Pharmacotherapy should be started at the time type 2 diabetes is diagnosed, without delay,” unless there’s a reason not to. Metformin has historically been the first choice. The bigger change of recent years is that the choice now depends on what else you have:

• Heart disease, heart failure or kidney disease. The standards recommend a GLP-1 receptor agonist and/or an SGLT2 inhibitor, whatever your A1c, because those drugs have shown benefits for the heart or kidneys.
• Overweight or obesity. The standards say medicines that help with weight loss should be prioritized. bodyfat.guide explains how the GLP-1 drugs work.
• Very high numbers. Insulin is considered when the A1c is over 10%, glucose is 300 mg/dL or more, or there are symptoms like strong thirst, peeing a lot or weight loss you didn’t try for.

Each has trade-offs. The ADA notes that sulfonylureas and meglitinides raise the risk of low blood sugar and weight gain, and that GLP-1 drugs can cause nausea and vomiting. It also says medicine costs can be a major source of stress and lead people to skip doses, so cost belongs in the conversation.

Can medicine ever be reduced?

Yes, with your doctor. The ADA’s standards say treatment should be adjusted, up or down, without delay when it isn’t fitting, and that the medicines most likely to cause lows or side effects are the first to step down. When a new medicine starts, the doctor should recheck the need for insulin or a sulfonylurea, since those cause lows. In the DiRECT trial, people came off their diabetes medicines at the start of a supervised weight loss program, and 46% were in remission a year later. That was a medical decision made by their doctors. Stopping on your own can send blood sugar high, and eating much less while still on insulin or a sulfonylurea can send it dangerously low (under 70 mg/dL is low and under 54 is serious, ADA 2026).

Questions to ask your doctor

1. Which stage am I in, and how sure are we? Has the result been confirmed with a second test?
2. Am I in a group the guidelines say should consider medicine now? For prediabetes, the metformin groups. For type 2, at diagnosis.
3. What would this medicine add for me beyond the changes I’m already making?
4. Do my heart, kidneys or weight point to a particular drug?
5. What are the side effects, and which ones should make me call you?
6. Can this cause low blood sugar, and what do I do if it does?
7. What will it cost me, and is there a cheaper option that works as well?
8. How will we know it’s working, and when do we retest my A1c?
9. If my numbers improve, could we step it down later?

Bring your numbers. What does my A1c mean? turns an A1c into an average glucose, and can I manage it with lifestyle, or do I need more help? shows where each stage sits.

Whatever you decide, decide it with your prescriber, and don’t start, stop or change a dose without them.