Can metformin plus Ozempic make my blood sugar drop too low?

The Ozempic label ties the low blood sugar warning to insulin and sulfonylureas, not metformin. Both metformin and Ozempic carry a low risk of lows when used without those drugs. Lows can still happen with skipped meals, heavy exercise, or alcohol.

Which sulfonylureas raise the risk with Ozempic?

The label warns about insulin secretagogues as a class, with sulfonylureas as the main example. Common sulfonylureas include glipizide, glyburide, and glimepiride. If you take one of these, ask your prescriber whether its dose should change when Ozempic starts.

Is a reading of 75 mg/dL on Ozempic a problem?

The CDC and NIDDK use below 70 mg/dL as the usual cutoff for low blood sugar in people with diabetes. Your own target may differ, so ask your care team what is low for you. Treat any reading below your target or any low symptoms right away.

Can Ozempic cause low blood sugar at night?

It can if you also take insulin or a sulfonylurea, or if you ate very little that day. The CDC says a continuous glucose monitor can alert you to lows during sleep. A bedtime snack can help if you are at risk.

Should I keep glucagon if I take Ozempic?

Glucagon is mainly for people at risk of severe lows, such as those on insulin or a sulfonylurea. NIDDK says glucagon is the best treatment when someone cannot treat a low on their own. Your doctor can tell you whether you need a prescription.

Can Ozempic Cause Low Blood Sugar, and Who Is Most at Risk?

The short answer: Ozempic rarely causes low blood sugar when it is the only diabetes drug you take. In its 30-week trial of Ozempic alone, no one had a severe low. The risk rises sharply when Ozempic is combined with insulin or a sulfonylurea. People on those drugs, adults 65 and older, and people with kidney disease or past lows are most at risk.

Does Ozempic cause low blood sugar on its own?

It can, but it is uncommon. The FDA-approved Ozempic label on DailyMed reports low blood sugar rates from its placebo-controlled trials in adults with type 2 diabetes. In the 30-week trial where Ozempic was the only diabetes drug, the results were:

Severe lows (needing help from another person): 0% on placebo, 0% on Ozempic 0.5 mg, and 0% on 1 mg.
Documented symptomatic lows (symptoms plus a reading of 70 mg/dL or less): 0% on placebo, 1.6% on 0.5 mg, and 3.8% on 1 mg.
Severe or confirmed lows at 56 mg/dL or less: 1.6% on placebo and 0% on both Ozempic doses.

So a few people on Ozempic alone had mild symptomatic lows. None had a serious one in that trial. Most people take Ozempic with metformin, which also carries a low risk on its own. Our article on taking Ozempic and metformin together covers that pairing in detail.

Why is the risk low when Ozempic is used alone?

The reason is how semaglutide, the drug in Ozempic, works. The label says it stimulates insulin release and lowers glucagon "in a glucose-dependent manner." In plain terms, Ozempic pushes insulin out mainly when blood sugar is high. As blood sugar falls toward normal, that push fades.

The label also reports a test in people with type 2 diabetes where blood sugar was lowered on purpose. Semaglutide did not blunt the body's glucagon response, which is one of its main defenses against a low. It also did not stop insulin output from falling as sugar dropped.

Insulin and sulfonylureas work differently. Injected insulin lowers blood sugar no matter what the level is. Sulfonylureas, such as glipizide, glyburide, and glimepiride, make the pancreas release insulin even when sugar is already normal. That is why these drugs drive most of the risk.

How much do insulin and sulfonylureas raise the risk?

A lot. The Ozempic label warns that combining it with insulin or an insulin secretagogue (a drug like a sulfonylurea that pushes the pancreas to release insulin) "may increase the risk of hypoglycemia, including severe hypoglycemia."

In the 30-week trial where Ozempic was added to basal insulin (with or without metformin), the label reports:

Documented symptomatic lows in 15.2% on placebo, 16.7% on Ozempic 0.5 mg, and 29.8% on 1 mg.
Severe or confirmed lows at 56 mg/dL or less in 5.3%, 8.3%, and 10.7%.
Severe lows in 0%, 0%, and 1.5%.

With a sulfonylurea, the label reports severe lows in 0.8% of people on 0.5 mg and 1.2% on 1 mg. Documented symptomatic lows occurred in 17.3% and 24.4%. Severe or confirmed lows occurred in 6.5% and 10.4%.

Compare those numbers with 0% severe lows on Ozempic alone. The difference comes from the added drug, not from Ozempic by itself. The label says the risk "may be lowered" by reducing the dose of the sulfonylurea or insulin, and it tells prescribers to consider that when Ozempic is started. That decision belongs to your prescriber. Do not change the dose of any diabetes drug on your own.

The same pattern shows up with tirzepatide. Our sister site covers Mounjaro and low blood sugar with insulin or sulfonylureas.

Who else is at higher risk of a low?

The NIDDK guide to low blood glucose lists the groups more likely to have lows. You are at higher risk if you:

take insulin or another diabetes medicine that raises insulin
are age 65 or older
had low blood glucose before
have kidney disease, heart disease, or cognitive impairment
have type 1 diabetes (Ozempic is not approved for type 1)

NIDDK also names everyday triggers. These include skipping or delaying meals, fasting before a procedure while still taking glucose-lowering drugs, and exercising more than usual. Physical activity can lower blood glucose for up to 24 hours. Drinking alcohol without enough food is another trigger, and alcohol can hide the first symptoms of a low.

Ozempic adds a twist here. It often cuts appetite, and nausea or vomiting can make you eat much less. Smaller meals on top of insulin or a sulfonylurea can tip blood sugar too low. See our guides on Ozempic and alcohol and exercising on Ozempic for more on those two triggers.

Some people stop feeling lows at all. The CDC page on low blood sugar calls this hypoglycemia unawareness. It is more likely after 5 to 10 years of diabetes, with frequent lows, or with certain medicines such as beta blockers.

What does low blood sugar feel like, and what should you do?

The MedlinePlus page on semaglutide injection lists the signs of low blood sugar. They include dizziness, sweating, hunger, shakiness, weakness, headache, irritability, drowsiness, blurred vision, slurred speech, a fast heartbeat, and feeling jittery.

The CDC says a reading below 70 mg/dL is considered low for most people with diabetes. NIDDK gives these steps when your reading is under 70 mg/dL or below your target:

Eat or drink 15 to 20 grams of fast sugar. Examples are four glucose tablets, half a cup of regular juice, or a tablespoon of sugar or honey.
Wait 15 minutes and check again.
If it is still low, repeat the step.
Once it is back in range, eat a snack or meal.

A severe low can leave you unable to treat yourself. NIDDK says glucagon, given as an injection or nasal spray, is the best treatment in that case. Ask your doctor whether you need a prescription for an emergency kit.

What about people without diabetes?

Ozempic is approved for adults with type 2 diabetes. Some people take semaglutide for weight loss under the Wegovy brand. The Wegovy label says lows "have been reported" with GLP-1 drugs in adults without type 2 diabetes. Its weight-loss trials did not track lows in a systematic way.

In a heart outcomes trial of adults without diabetes, the Wegovy label reports 3 serious lows on semaglutide and 1 on placebo. People with past bariatric surgery had more serious lows on semaglutide (2.3%, 2 of 87) than on placebo (0%). The label calls bariatric surgery a risk factor for low blood sugar.

In adults with type 2 diabetes, Wegovy's higher 2.4 mg dose caused more lows than the 1 mg Ozempic-strength dose. The rate was 10.7 versus 7.2 episodes per 100 patient-years. Clinically significant lows (under 54 mg/dL) occurred in 6.2% on Wegovy and 2.5% on placebo.

The bottom line

Ozempic by itself rarely drops blood sugar too low, because it acts mainly when sugar is high. The big risk comes from pairing it with insulin or a sulfonylurea. With those drugs, up to about 3 in 10 people had symptomatic lows in label trials. Older age, kidney disease, past lows, skipped meals, and alcohol add to the risk. If you take insulin or a sulfonylurea, learn the warning signs and ask your prescriber how to adjust when you start.

Last updated: October 2026. This article is for informational purposes only and does not constitute medical advice. Talk to your doctor or pharmacist before changing any diabetes medicine.