Does Ozempic cause gallstones?

Ozempic (semaglutide) itself doesn't directly cause gallstones, but the rapid weight loss it produces is a well-established gallstone risk factor. Clinical trials show gallbladder-related problems occur in roughly 1.5-3% of semaglutide users, compared to under 1% on placebo. The faster and greater the weight loss, the higher the risk -- this is true of any rapid weight loss method, not just GLP-1 medications.

What are the warning signs of gallstones on Ozempic?

Watch for sudden, intense pain in the upper right or centre abdomen (especially after fatty meals), pain that spreads to your right shoulder or back, nausea or vomiting, fever, or yellowing of the skin or eyes (jaundice). Steady severe pain lasting several hours, fever, or jaundice can indicate a gallbladder infection or blocked bile duct and needs urgent medical attention.

How can I reduce my risk of gallstones while losing weight?

Avoid losing weight faster than about 0.5-1kg per week where possible, don't skip meals for long stretches (this concentrates bile), include a small amount of healthy fat at meals to keep the gallbladder contracting normally, stay well-hydrated, and maintain adequate fibre intake. If you're at higher risk (family history, female, over 40, existing gallstones), discuss this with your doctor before starting semaglutide.

Should I stop taking Ozempic if I develop gallstones?

Not without medical guidance. Many people with silent (asymptomatic) gallstones continue GLP-1 treatment safely under monitoring. If gallstones become symptomatic (causing pain or complications), your doctor may recommend gallbladder removal (cholecystectomy) -- after which most people can safely resume or continue semaglutide, as covered in our gallbladder removal recovery guide.

Ozempic and Gallstones: Why Rapid Weight Loss Raises Your Risk (SA Guide 2026)

By Weight Loss Diets SA | Updated July 2026 | 8 min read

Sudden pain under your right ribs after a fatty meal is one of the more alarming things that can happen while you're doing everything "right" on Ozempic or Wegovy. If it happens to you, there's a good chance it's your gallbladder -- and it's more common on GLP-1 medications than most people realise.

Key point: Gallstone-related problems occur in roughly 1.5-3% of people using semaglutide for weight loss, compared to under 1% on placebo in clinical trials. This isn't a direct drug toxicity effect -- it's driven mainly by how fast and how much weight you lose, which is exactly what makes Ozempic effective in the first place.

Why Does Rapid Weight Loss Cause Gallstones?

Your gallbladder stores and concentrates bile, which your body uses to digest fat. Most gallstones are made mostly of cholesterol. Several things happen during rapid weight loss that tip the balance toward stone formation:

Cholesterol mobilisation: As fat cells shrink, they release stored cholesterol into the bloodstream, which the liver then dumps into bile -- making bile more cholesterol-saturated and stone-prone
Reduced gallbladder emptying: Eating less overall (a natural effect of Ozempic's appetite suppression) means the gallbladder contracts less often, so bile sits and concentrates rather than being regularly flushed out
Slower gut motility: Semaglutide is well known for slowing stomach and gut emptying -- part of why it makes you feel full -- and this same mechanism can affect bile flow

This is not unique to Ozempic. Any method of rapid weight loss -- very low-calorie diets, bariatric surgery, extreme fasting protocols -- carries a similar, sometimes even higher, gallstone risk. It's a predictable side effect of fast fat loss, not a flaw specific to GLP-1 drugs.

Who Is Most at Risk?

Risk Factor	Why It Matters
Female sex	Oestrogen increases cholesterol content in bile; women are roughly twice as likely to develop gallstones
Age over 40	Gallstone risk rises steadily with age
Family history	A genetic predisposition to cholesterol-rich bile runs in families
Starting BMI significantly above normal	More stored cholesterol to mobilise during weight loss
Very rapid weight loss (over 1.5kg/week sustained)	The faster the loss, the higher the cholesterol saturation spike in bile
Existing gallstones (even silent ones)	Pre-existing stones can become symptomatic as bile chemistry shifts

Warning Signs to Watch For

Many gallstones cause no symptoms at all and are only found by accident on a scan. When they do cause problems, look out for:

Sudden, intense pain in the upper right or centre of your abdomen, often after a fatty meal
Pain that spreads to your right shoulder blade or back
Nausea or vomiting alongside the pain
Bloating or discomfort that lingers for hours after eating

Seek urgent medical care if: the pain is severe and doesn't ease within a few hours, you develop fever or chills, your skin or the whites of your eyes turn yellow (jaundice), or your urine turns dark and stools become pale. These can signal a blocked bile duct, gallbladder infection, or pancreatitis -- all of which need same-day medical attention.

How to Lower Your Risk While Losing Weight

Pace Your Weight Loss

Where your treatment plan allows, aiming for roughly 0.5-1kg per week (rather than the fastest possible loss) reduces gallstone risk. Discuss your dose titration schedule with your prescriber if you're losing weight unusually fast.

Don't Skip Meals for Long Stretches

Long gaps between meals mean your gallbladder isn't triggered to contract and empty, allowing bile to sit and concentrate. Even a small meal or snack with a bit of healthy fat -- peanut butter on a rice cake, a few almonds, a boiled egg -- helps keep things moving.

Include Healthy Fats, Don't Eliminate Them

A very low-fat diet, ironically, can worsen gallstone risk because it reduces the stimulus for gallbladder emptying. Small amounts of olive oil, avocado, nuts, or fatty fish at meals help maintain normal gallbladder function.

Stay Hydrated and Keep Fibre Up

Adequate water and fibre intake support healthy bile composition and digestion generally. Rooibos, water, and high-fibre vegetables are easy, budget-friendly additions to a South African diet already adapting to smaller Ozempic-era portions.

Already Had Your Gallbladder Removed?

Many people continue losing weight successfully on Ozempic after a cholecystectomy. Read our full recovery and diet guide.

Weight Loss After Gallbladder Removal: SA Guide

Bottom Line

Gallstones are a real but manageable risk of the rapid weight loss Ozempic and Wegovy can produce -- not a reason to avoid treatment, but a reason to pace your weight loss sensibly and know the warning signs. Most people never experience a problem; for those who do, gallbladder issues are very treatable, and gallbladder removal (if needed) does not usually derail your weight-loss progress or require stopping your GLP-1 medication long-term.

Medical disclaimer: This article is for information only and is not a substitute for professional medical advice. If you suspect gallstones or are experiencing abdominal pain, consult your doctor promptly. Always discuss your individual risk factors with your prescriber before and during semaglutide treatment.