Gallbladder problems are one of the less-talked-about warnings on Ozempic and its relatives.
They are uncommon in the trials, but they are real, and they can end in surgery. The wider warning list is in semaglutide side effects. This page covers the gallbladder figures in detail.
What the labels count
The labels use two terms. Cholelithiasis means gallstones. Cholecystitis means an inflamed gallbladder, usually caused by a stone.
| Drug, population and event | Drug group | Placebo |
|---|---|---|
| Ozempic 0.5 mg, type 2 diabetes: gallstones | 1.5% | 0% |
| Ozempic 1 mg, type 2 diabetes: gallstones | 0.4% | 0% |
| Wegovy injection, adults, weight: gallstones | 1.6% | 0.7% |
| Wegovy injection, adults, weight: inflammation | 0.6% | 0.2% |
| Wegovy tablet, adults, weight: gallstones | 2.5% | 1% |
| Wegovy injection, ages 12 and up: gallstones | 3.8% | 0% |
| Mounjaro, type 2 diabetes: acute gallbladder disease | 0.6% | 0% |
| Zepbound, weight: gallstones | 1.1% | 1% |
| Zepbound, weight: inflammation | 0.7% | 0.2% |
| Zepbound, weight: gallbladder removal | 0.2% | 0% |
The Ozempic figures come from its diabetes trials [1]. Gallstones were not reported at all on placebo there.
The Wegovy label reports the adult weight trials and a trial in adolescents [2]. It says gallstones and inflammation were more common in the adolescents than in adults. In that trial, inflammation ran 0.8% against 0%.
The Mounjaro figure groups gallstones, biliary colic and gallbladder removal into one count [3]. The Zepbound figures come from two weight trials [4].
These are separate trials in different people. The rows are not a head-to-head comparison of the drugs.
Is it the drug or the weight loss?
Losing weight quickly is itself a known cause of gallstones. The labels say so, and they differ on how far it explains the excess.
The Wegovy label states that substantial or rapid weight loss can increase gallstone risk [2]. It then adds that acute gallbladder disease was more frequent on the drug “even after accounting for the degree of weight loss.”
The Zepbound label puts it more briefly: “Acute gallbladder events were associated with weight reduction” [4]. It does not say whether the excess remains once weight lost is accounted for.
How much weight people lost in those trials is covered in how much weight you can lose on semaglutide.
What 76 trials show together
A 2022 meta-analysis pooled 76 randomized trials with 103,371 patients [5]. It compared GLP-1 drugs with placebo or with other, non-GLP-1 treatments.
GLP-1 drugs were tied to more gallbladder or bile duct disease: relative risk 1.37 (95% CI 1.23 to 1.52). For gallstones alone it was 1.27, and for inflammation 1.36.
The risk was not the same in every setting. Three splits stood out.
| Setting | Relative risk (95% CI) |
|---|---|
| Weight-loss trials (13) | 2.29 (1.64 to 3.18) |
| Type 2 diabetes or other trials (63) | 1.27 (1.14 to 1.43) |
| Higher doses | 1.56 (1.36 to 1.78) |
| Lower doses | 0.99 (0.73 to 1.33) |
| Longer use | 1.40 (1.26 to 1.56) |
| Shorter use | 0.79 (0.48 to 1.31) |
So the excess was concentrated at weight-loss doses and with longer use. At lower doses and shorter use, the pooled estimate crossed 1, meaning no clear difference.
A relative risk is not the chance for any one person. The label rates above are the better guide to how often it happens: from under 1 to about 4 in 100 for gallstones, depending on the drug and the group.
Warning signs the labels list
The Medication Guides for Ozempic, Wegovy and Zepbound list the same symptoms of gallbladder problems [1] [2] [4]:
- pain in the upper stomach (abdomen)
- fever
- yellowing of the skin or eyes (jaundice)
- clay-colored stools
The Ozempic guide tells patients to contact their healthcare provider right away if these appear. The Wegovy guide adds that some gallbladder problems need surgery [2].
For clinicians, the labels say that suspected gallstones call for gallbladder studies and follow-up [3]. The Ozempic label also lists gallbladder inflammation and gallbladder removal among its postmarketing reports [1].
Upper belly pain can have other causes on these drugs. Severe pain that spreads to the back is the pancreatitis warning, covered in Ozempic nausea and tirzepatide side effects.
If gallbladder surgery is ever needed, the drug also matters for anesthesia. That is covered in Ozempic and anesthesia. Dose steps are in semaglutide dosage.