Yes, GLP-1 medications like Ozempic, Wegovy, Mounjaro, and Zepbound can increase your risk of gallstones. But this isn't unique to these medications—any significant weight loss raises gallstone risk. Here's what you need to know to protect yourself.
The Quick Answer
GLP-1 medications are associated with a 1.5-2.5x increased risk of gallbladder problems compared to placebo. However, this risk comes primarily from rapid weight loss, not the medication itself. The risk is real but manageable with awareness and prevention strategies.
What Are Gallstones?
Gallstones are hardened deposits of digestive fluid (bile) that form in the gallbladder. They can range from tiny grains to golf ball-sized stones. Many people have gallstones without symptoms, but when stones block bile ducts, they cause intense pain and complications.
The most common type (80%). Form when bile contains too much cholesterol. These are the type associated with weight loss.
Form when bile contains too much bilirubin. More common with certain blood disorders or liver disease.
The Weight Loss Connection
Rapid weight loss is a well-known risk factor for gallstones—regardless of how that weight loss occurs. Here's why:
Cholesterol Release
When you lose fat, cholesterol stored in fat tissue is released and processed by the liver, which secretes it into bile. This supersaturates bile with cholesterol.
Reduced Gallbladder Emptying
Eating less (as happens on GLP-1s) means your gallbladder contracts less often. Bile sits longer, allowing crystals to form and grow into stones.
Slower GI Motility
GLP-1 medications slow digestive transit, which may also affect gallbladder function and bile flow.
What Does the Research Show?
| Medication | Study | Gallbladder Events | vs Placebo |
|---|---|---|---|
| Semaglutide (Wegovy) | STEP trials | 2.6% of participants | vs 1.2% placebo |
| Tirzepatide (Zepbound) | SURMOUNT-1 | 1.7-2.0% of participants | vs 0.4% placebo |
| Liraglutide (Saxenda) | SCALE trials | 2.5% of participants | vs 0.8% placebo |
Note: "Gallbladder events" includes gallstones, cholecystitis (inflammation), and related conditions.
Important Context
While the relative risk increase sounds concerning (2x higher), the absolute risk remains low. About 2-3% of people on GLP-1s developed gallbladder issues in trials, meaning 97-98% did not. Similar rates are seen with bariatric surgery and very low calorie diets.
Warning Signs of Gallbladder Problems
Recognizing symptoms early is important. Seek medical attention if you experience:
Seek Immediate Care
- Severe, sudden pain in upper right abdomen
- Pain radiating to right shoulder or back
- Fever with abdominal pain
- Yellowing of skin or eyes (jaundice)
Contact Your Provider
- Recurring pain after fatty meals
- Nausea or vomiting (beyond typical GLP-1 side effects)
- Bloating and indigestion
- Clay-colored stools or dark urine
How to Reduce Your Risk
1. Don't Skip Meals Entirely
Even if you're not hungry, eat small amounts regularly. This keeps your gallbladder contracting and emptying bile, preventing stagnation. Aim for at least 3 small meals daily.
2. Include Some Healthy Fats
Fat triggers gallbladder contraction. Include moderate amounts of healthy fats (olive oil, avocado, nuts) at each meal. Very low-fat diets may actually increase gallstone risk.
3. Eat Plenty of Fiber
High-fiber diets are associated with lower gallstone risk. Focus on vegetables, fruits, legumes, and whole grains. Fiber also helps with GLP-1 side effects.
4. Consider Slower Weight Loss
Very rapid weight loss (more than 3 lbs/week) significantly increases gallstone risk. If possible, discuss with your provider about moderating your dose to slow weight loss to 1-2 lbs/week.
5. Stay Hydrated
Adequate hydration helps maintain bile flow. Drink 64-80 oz of water daily. Dehydration can concentrate bile and promote stone formation.
6. Limit Refined Carbs and Sugar
High sugar and refined carbohydrate intake is associated with increased gallstone risk. Focus on whole foods and limit processed foods.
Should You Be Screened?
Routine screening for gallstones isn't typically recommended for everyone on GLP-1 medications. However, your provider may recommend an ultrasound if you:
- Have a history of gallbladder problems
- Are losing weight very rapidly (more than 3 lbs/week)
- Have multiple risk factors (female, over 40, family history)
- Experience symptoms suggestive of gallbladder issues
Preventive Medication Option
Ursodiol (Ursodeoxycholic Acid)
Some providers prescribe ursodiol (Actigall, Urso) during rapid weight loss to prevent gallstones. This medication dissolves cholesterol in bile and is commonly used after bariatric surgery.
Typical dose: 300mg twice daily during active weight loss phase. Studies show ursodiol can reduce gallstone formation by 70-80% in high-risk patients. Ask your provider if this is appropriate for you.
Frequently Asked Questions
Should I stop taking my GLP-1 if I develop gallstones?
Not necessarily. Many people have "silent" gallstones that don't cause problems. If you develop symptomatic gallstones, your provider will weigh the benefits of continuing the medication against the risks. Sometimes gallbladder removal is recommended while continuing GLP-1 therapy.
Is the risk higher with Mounjaro or Ozempic?
Clinical trial data shows similar gallbladder event rates for both medications. The risk correlates more with the amount and speed of weight loss than the specific medication. Tirzepatide may have slightly higher risk since it produces more weight loss on average.
Can I take GLP-1 medications if I've had my gallbladder removed?
Yes. If you've already had a cholecystectomy (gallbladder removal), you can't develop gallstones. GLP-1 medications are safe to use in this case.
Does the risk go away after I stop losing weight?
The highest risk period is during active, rapid weight loss. Once your weight stabilizes, the risk of forming new gallstones decreases significantly, though existing stones may remain.
Are women at higher risk?
Yes. Women are 2-3x more likely to develop gallstones than men, especially after age 40 or if they've been pregnant. Estrogen increases cholesterol in bile. Women on GLP-1 medications should be particularly vigilant about symptoms.
The Bottom Line
GLP-1 medications do increase gallstone risk, but this is primarily due to rapid weight loss rather than the medication itself. The absolute risk remains low (2-3%), and prevention strategies can help reduce it further. Don't let gallstone concerns prevent you from pursuing treatment for obesity—the health benefits of weight loss far outweigh this manageable risk. Just stay aware of symptoms and discuss any concerns with your healthcare provider.
For more information, see our guide on managing GLP-1 side effects or learn about the best diet while taking GLP-1 medications.