Yes, there is medication for prediabetes. Metformin is the most widely prescribed drug for people whose blood sugar is above normal but hasn’t yet reached the type 2 diabetes threshold. It’s not prescribed to everyone with prediabetes, though. Guidelines generally reserve it for people at higher risk of progressing to full diabetes, and lifestyle changes remain the more effective first-line approach for most people.
How Well Medication Works Compared to Lifestyle Changes
The landmark Diabetes Prevention Program trial, one of the largest studies on prediabetes, found that metformin reduced the risk of developing type 2 diabetes by 31% compared to a placebo over three years. That’s meaningful, but lifestyle intervention (a combination of moderate exercise and modest weight loss) cut the risk by 58% in the same trial. In other words, changing your diet and activity level was roughly twice as effective as taking a pill.
That doesn’t make metformin useless. For people who struggle to maintain lifestyle changes long term, or who face higher metabolic risk, medication provides a reliable layer of protection that doesn’t depend on willpower alone. Many clinicians recommend both together.
Who Gets Prescribed Metformin for Prediabetes
Doctors don’t typically prescribe metformin to every person with borderline blood sugar. The American Diabetes Association recommends considering it for people who meet specific risk criteria, particularly those under 60 with a BMI of 35 or higher. Women with a history of gestational diabetes are another group where metformin is commonly discussed, since their lifetime risk of developing type 2 diabetes is substantially elevated.
If you’re over 60, or your BMI is lower, your doctor is more likely to recommend starting with diet and exercise alone. That said, prescribing patterns vary. A study published in the Journal of the American Board of Family Medicine found that metformin prescription rates for eligible prediabetes patients remain low overall, suggesting many people who could benefit aren’t being offered it.
What Taking Metformin Looks Like
Metformin is taken as a tablet (or sometimes a liquid), usually with meals. Most people start at a low dose, typically one 500mg tablet with breakfast, and increase gradually over several weeks. A common pattern is adding a second daily dose after the first week and a third after the second week. This slow ramp-up is intentional: it significantly reduces the chance of digestive side effects. The maximum daily dose is 2,000mg.
The medication works by reducing the amount of sugar your liver releases into your bloodstream and by helping your cells respond better to insulin. It doesn’t cause low blood sugar on its own, which is one reason it’s considered safe for prediabetes rather than just for people already diagnosed with diabetes.
Side Effects and How to Manage Them
Digestive issues are the most common complaint. Diarrhea tops the list, followed by gas, nausea, indigestion, and occasional vomiting. These side effects are most pronounced in the first few weeks and often settle down as your body adjusts. Taking the medication with food helps, and the gradual dose increase mentioned above makes a real difference.
If stomach problems persist, an extended-release version of metformin is available. It dissolves more slowly in your system, and clinical data shows it causes less diarrhea, nausea, and vomiting than the standard version. Some people who couldn’t tolerate the immediate-release tablet do fine on the extended-release form.
One longer-term concern worth knowing about: metformin can lower your vitamin B12 levels over time. The UK’s medicines regulator classifies B12 deficiency as a common side effect, potentially affecting up to 1 in 10 people who take the drug. The risk increases with higher doses and longer use. B12 deficiency can cause fatigue, numbness or tingling in your hands and feet, and cognitive changes. If you take metformin for an extended period, periodic blood tests to check your B12 level are a reasonable precaution, especially if you have other risk factors for deficiency like a vegetarian diet or older age.
Newer Medications Under Investigation
Metformin has been the go-to option for decades, but a newer class of drugs is showing promise. Results from the SELECT trial, a large global study involving over 17,600 participants across 41 countries, found that semaglutide (the active ingredient in drugs originally developed for diabetes and weight loss) reduced progression from prediabetes to type 2 diabetes. About two-thirds of trial participants had prediabetes at the start, and the effect held regardless of body weight or BMI.
These medications aren’t yet standard recommendations specifically for prediabetes the way metformin is. They’re significantly more expensive, require injection (in most formulations), and carry their own side effect profile. But for people who are also managing obesity or cardiovascular risk, they represent an option that may address multiple problems at once. This is a space where treatment options are actively expanding.
How Lifestyle Changes Fit In
Medication for prediabetes works best as part of a broader strategy, not a replacement for one. The lifestyle arm of the Diabetes Prevention Program asked participants to aim for 150 minutes of moderate physical activity per week (like brisk walking) and a 7% reduction in body weight. For someone weighing 200 pounds, that’s about 14 pounds. These modest targets produced the 58% risk reduction that outperformed metformin alone.
You don’t need to overhaul your life overnight. Small, sustained changes in how much you move and what you eat produce measurable results. If your doctor brings up metformin, it’s worth asking whether it’s being suggested instead of lifestyle changes or alongside them. For most people, the answer is alongside, with the medication providing additional protection while you work on habits that will serve you for the long term.