Guide · Updated November 2026

GLP-1 and Gallbladder Problems: What to Watch For

GLP-1 drugs like semaglutide (Ozempic, Wegovy) and tirzepatide (Mounjaro, Zepbound) raise the risk of gallstones and gallbladder inflammation. In Wegovy's weight-loss trials, gallstones were reported in 1.6% of adults on Wegovy versus 0.7% on placebo. In Zepbound's trials, gallbladder inflammation (cholecystitis) was reported in 0.7% versus 0.2%. Rapid weight loss raises gallstone risk, but the Wegovy label says the higher rate held even after accounting for how much weight people lost.

Why Gallstones Happen During Rapid Weight Loss

Gallstones are a known risk of losing weight quickly from any cause. The NIDDK notes that “losing weight very quickly may raise your chances of forming gallstones,” and that weight-loss surgery and very low-calorie diets carry higher risk.

Here is the usual explanation. Your liver puts cholesterol into bile, which is stored in the gallbladder. During fast weight loss, bile can carry more cholesterol than it can hold in solution, and crystals can clump into stones. Eating less also means the gallbladder contracts less often, so bile sits longer.

GLP-1 drugs may add their own effect. The Wegovy label says the rate of acute gallbladder disease was higher on Wegovy than placebo “even after accounting for the degree of weight loss.” So weight loss is part of the story, not all of it.

I have been on Mounjaro for months, and my appetite dropped hard in the first 8 weeks. I was eating maybe 1,200 calories some days, which is the kind of steep restriction that can raise gallstone risk. It is one of those side effects that gets less attention than nausea or fatigue.

What the Labels and Trials Show

The FDA labels pool the main weight-loss trials, so they are the cleanest place to compare rates.

Drug (label)	Gallstones (cholelithiasis)	Gallbladder inflammation (cholecystitis)	Gallbladder removal
Wegovy injection, adults	1.6% vs 0.7% placebo	0.6% vs 0.2% placebo	Not listed in this section
Zepbound, Studies 1 and 2	1.1% vs 1% placebo	0.7% vs 0.2% placebo	0.2% vs 0% placebo

The Wegovy label also reports higher rates in teens aged 12 and older, with gallstones in 3.8% of Wegovy-treated patients and 0% on placebo. The Zepbound label says “acute gallbladder events were associated with weight reduction.”

For context on the weight loss involved, STEP 1 reported a mean 14.9% weight loss on semaglutide 2.4 mg at 68 weeks. SURMOUNT-1 reported 15.0% to 20.9% on tirzepatide 5 mg to 15 mg at 72 weeks.

The largest pooled analysis

A 2022 meta-analysis in JAMA Internal Medicine pooled 76 randomized trials with 103,371 patients. GLP-1 drug use was linked to a 37% higher relative risk of gallbladder or biliary disease overall (RR 1.37). In weight-loss trials the relative risk was 2.29, and risk was higher at higher doses and longer use. In absolute terms, the rates in the labels above are still low, a few people per hundred or fewer.

Both labels list acute gallbladder disease as a warning and say that if gallstones or cholecystitis are suspected, gallbladder studies and clinical follow-up are needed.

Who May Be at Higher Risk

The NIDDK lists factors that raise gallstone risk around weight loss, including gallstones that existed before, a large amount of extra weight, and very quick weight loss. The JAMA meta-analysis found higher risk with higher doses, longer use, and use for weight loss. If you have had gallstones or gallbladder sludge before, tell your prescriber before you start. It does not automatically rule out the medication. It means you should both know what to watch for.

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Symptoms You Should Not Ignore

The NIDDK says most people with gallstones do not have symptoms. Problems start when a stone blocks a duct or the gallbladder becomes inflamed.

Gallbladder attacks “usually cause pain in your upper right abdomen, sometimes lasting several hours,” and often follow heavy meals, usually in the evening or at night.

Get care right away if you have any of these, which the NIDDK lists:

Pain in your abdomen lasting several hours
Nausea and vomiting
Fever, even a low-grade fever, or chills
Yellowing of your skin or the whites of your eyes (jaundice)
Tea-colored urine and light-colored stools

Here is the tricky part for GLP-1 users: nausea and stomach upset overlap with normal medication side effects. Pain that is new, severe, centered in the upper right abdomen, or that lasts for hours is not something to wait out. Severe stomach pain on a GLP-1 can also be pancreatitis, which both labels warn about, so call your prescriber or seek urgent care. An abdominal ultrasound is a common first test for gallstones.

Lowering Your Risk

You cannot remove the risk, but some steps are reasonable to discuss with your prescriber:

Avoid stacking crash dieting on top of the medication. The NIDDK says losing weight very quickly may raise gallstone risk. Follow your prescriber’s dose schedule rather than pushing for faster loss.
Keep regular meals with some fat and protein, as far as your appetite allows. Ask a registered dietitian for targets that fit your health history.
Stay hydrated. GLP-1 side effects like vomiting and diarrhea can dehydrate you, and both labels warn about kidney injury from dehydration.
Ask about ursodiol if you are high risk. The NIDDK says ursodiol “can help prevent gallstones in people who lose weight rapidly” through very low-calorie diets or weight-loss surgery. Whether it fits your situation on a GLP-1, and at what dose, is a decision for your prescriber. Do not start it on your own.

What Happens If You Do Get Gallstones

If you develop gallstones on a GLP-1, the treatment options are the same as for anyone else.

No symptoms: The NIDDK says “if your gallstones are not causing symptoms, you probably don’t need treatment.”

Gallbladder removal (cholecystectomy): This is one of the most common operations on adults in the United States. Most are laparoscopic and done as outpatient procedures, and recovery to normal activity takes about a week, according to the NIDDK. “You can live normally without a gallbladder,” though some people have softer, more frequent stools afterward.

Ursodiol to dissolve stones: It works best on small cholesterol stones and can take months or years. Gallstones can return even with treatment.

Do you need to stop your GLP-1? That is your prescriber’s call based on your symptoms and history. Do not stop or restart the medication on your own.

The Bigger Picture: Risk vs Benefit

Gallbladder risk sits alongside real benefits. In SURMOUNT-5 (NEJM, 2025), tirzepatide produced 20.2% weight loss at 72 weeks versus 13.7% with semaglutide. In the SELECT trial, semaglutide 2.4 mg lowered the rate of cardiovascular death, heart attack or stroke by 20% (hazard ratio 0.80) in adults with existing heart disease and overweight or obesity but no diabetes.

For most people the gallbladder risk is something to watch, not a reason to avoid treatment. That trade-off is personal, so talk it through with your prescriber, especially if you have had gallbladder problems before. If you are weighing the cost of GLP-1 treatment, that is a separate question from safety.

The Bottom Line

GLP-1 drugs raise the risk of gallstones and gallbladder inflammation. In the label trials the absolute rates were low, mostly under 2%, but higher than placebo. Know the warning signs, especially pain in the upper right abdomen that lasts for hours, fever, or yellowing skin. Avoid crash dieting on top of the medication, stay hydrated, and tell your prescriber if you have had gallstones before.

Check your options in our provider directory or use the body composition calculator to track your progress.

FAQ

Can GLP-1 medications cause gallstones?

Yes. Both the Wegovy and Zepbound labels list acute gallbladder disease as a warning. In Wegovy’s adult weight-loss trials, gallstones were reported in 1.6% of patients versus 0.7% on placebo. A 2022 meta-analysis of 76 trials found a 37% higher relative risk of gallbladder or biliary disease with GLP-1 drugs overall.

How do I tell the difference between GLP-1 nausea and a gallbladder attack?

GLP-1 nausea is usually a general queasiness that comes and goes. A gallbladder attack usually causes pain in the upper right abdomen that can last several hours, often after a heavy meal. Fever, chills, or yellowing of the skin or eyes need care right away. If you are not sure, call your prescriber.

Should I stop my GLP-1 if I get gallstones?

That decision belongs to your prescriber, based on your symptoms and history. Do not stop or restart the medication on your own.

Does the type of GLP-1 matter for gallbladder risk?

Both semaglutide and tirzepatide carry the same label warning. Rates differ a little between the labels, but they come from different trials, so they are not a head-to-head comparison.

Can I prevent gallstones while on a GLP-1?

You can lower the risk. Avoid crash dieting on top of the medication, keep regular meals as your appetite allows, and stay hydrated. If you are high risk, ask your prescriber whether ursodiol makes sense for you.

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What we checked

This AI-assisted public-source desk check reviewed the Wegovy and Zepbound FDA labels on DailyMed, the STEP 1, SURMOUNT-1, SURMOUNT-5 and SELECT trial abstracts, a 2022 JAMA Internal Medicine meta-analysis, and NIDDK gallstone pages on November 4, 2026. This is not a clinical review and it is not medical advice. Prices and policies change, so confirm them with the provider or your prescriber before you act.