Sulfur burps are a common side effect of GLP-1 medications: semaglutide (Ozempic, Wegovy, Rybelsus) and tirzepatide (Mounjaro, Zepbound). These drugs slow down how fast your stomach empties. Food, especially protein, sits there longer than usual and starts to ferment, and bacteria release hydrogen sulfide, the rotten-egg gas you taste when you burp. In the Wegovy trials, burping was reported by 7% of people on the drug vs under 1% on placebo, and it’s most common while the dose is being increased.
For most people they ease within a few weeks of settling on a dose, as the stomach adjusts. To stop them sooner: eat smaller meals, spread your protein across the day rather than loading one meal, cut back on eggs, red meat, cruciferous vegetables and protein shakes, avoid fatty food and fizzy drinks, walk after eating, and use Pepto-Bismol on bad days. If they come with repeated vomiting, severe stomach pain or signs of dehydration, contact your prescriber.
Key Takeaways
- GLP-1 drugs slow gastric emptying, so food ferments in the stomach and produces hydrogen sulfide. That’s the rotten-egg smell.
- Burping (eructation) is a listed side effect: 7% on Wegovy vs <1% on placebo, and up to 5% on Zepbound vs 1% on placebo.
- Semaglutide and tirzepatide cause it the same way. Ozempic, Wegovy, Mounjaro and Zepbound are all in the same boat.
- Symptoms are worst during dose escalation and usually settle as your body adapts to a stable dose.
- The high-protein advice given to GLP-1 users can make sulfur burps worse if the protein comes in one big meal or shake.
- Best fixes: smaller meals, protein spread through the day, fewer sulfur-heavy foods, less fat, no carbonation, a walk after meals.
- Pepto-Bismol binds the sulfur gas directly and works well for an occasional bad day.
- Repeated vomiting, severe abdominal pain, vomiting food eaten many hours earlier, or dehydration need medical attention.
Why Ozempic, Mounjaro and Zepbound Cause Sulfur Burps
Sulfur burps aren’t caused by the drug itself smelling of anything. They’re caused by what the drug does to your digestion.
1. Food stays in your stomach longer
GLP-1 receptor agonists, and tirzepatide, which acts on both the GLP-1 and GIP receptors, slow the rate at which your stomach empties into the small intestine. That’s part of how they work. A slower stomach means you feel full sooner and for longer. A 2024 review confirmed that these drugs delay gastric emptying in a way that has real clinical consequences [Jalleh et al., Journal of Clinical Endocrinology and Metabolism, 2024].
You can see how big the effect is in endoscopy data. In one analysis of people having upper endoscopy, food was still in the stomach in 24.2% of semaglutide users despite standard fasting, compared with 5.1% of non-users [Silveira et al., Journal of Clinical Anesthesia, 2023]. That’s why you’re now asked to tell your anesthetist you’re on one of these drugs before a procedure.
2. Food that sits, ferments
Normally, food moves through your stomach within a few hours and most bacterial fermentation happens much further down, in the colon. When a meal lingers, bacteria have more time to work on it higher up. Protein foods contain the sulfur amino acids methionine and cysteine, and when bacteria break them down they release hydrogen sulfide. If that gas forms in the stomach rather than the colon, the easiest way out is up, as a burp. I cover the full mechanism in my main guide to sulfur burps.
3. The protein advice doesn’t help
Most people on GLP-1 drugs are told, rightly, to eat plenty of protein to protect muscle while losing weight. But eggs, red meat and whey protein shakes are some of the richest sources of sulfur amino acids. So you’re often adding more sulfur to a stomach that’s emptying more slowly. That’s a big reason sulfur burps turn up so often on these medications, and it’s also something you can change.
How Common Are Sulfur Burps on GLP-1s?
The drug labels don’t say “sulfur burps” specifically, but they do record burping (eructation). In the main Wegovy (semaglutide 2.4 mg) weight-loss trials, eructation was reported by 7% of people on the drug vs less than 1% on placebo, along with dyspepsia (9% vs 3%) and flatulence (6% vs 4%). The label notes these effects were most frequently reported during dose escalation [U.S. Food and Drug Administration, Wegovy Prescribing Information, 2025].
For Zepbound (tirzepatide), eructation was reported by 4–5% of people across the 5, 10 and 15 mg doses vs 1% on placebo, and the label states that most nausea, vomiting and diarrhea events happened during dose escalation and decreased over time [U.S. Food and Drug Administration, Zepbound Prescribing Information, 2026]. Mounjaro is the same molecule as Zepbound, so the same applies.
Those percentages count any reported burping, not specifically the eggy kind, so they don’t tell us exactly how many people get sulfur burps. But they show that burping is a real, drug-related effect, not a coincidence.
Ozempic vs Mounjaro vs Zepbound: Is One Worse?
People often ask whether switching drugs would help. The honest answer is that there’s no head-to-head data on sulfur burps specifically. Semaglutide (Ozempic, Wegovy, Rybelsus) and tirzepatide (Mounjaro, Zepbound) both slow gastric emptying, and both list burping, bloating and indigestion as side effects. Overall rates of stomach side effects are broadly comparable across the class. What matters more is the dose, how quickly it was increased, and what you’re eating. Some people do tolerate one drug better than another, and that’s a conversation to have with your prescriber rather than something to decide from trial averages.
How Long Do Sulfur Burps Last on Ozempic or Mounjaro?
For most people, sulfur burps are worst in two situations:
- The first few weeks after starting, or after each dose increase. Both labels say stomach side effects cluster around dose escalation.
- The first day or few after each weekly injection, when drug levels are highest. Many people notice their burps follow a weekly rhythm.
The good news is that the gastric-emptying effect of long-acting GLP-1 drugs partly wears off over time, a process called tachyphylaxis. Stomach emptying stays slower than normal, but less so than at the start [Jalleh et al., Journal of Clinical Endocrinology and Metabolism, 2024]. That fits what most people report: sulfur burps ease once they’ve been on a steady dose for a few weeks. If they’re still happening regularly after a month or two at the same dose, or getting worse, raise it with your prescriber.
How to Get Rid of Sulfur Burps From Ozempic, Mounjaro or Zepbound
1. Eat smaller meals
This makes the biggest difference. A slow stomach handles small amounts much better than big meals. Stop eating when you first feel satisfied, not when you’re full. On these drugs, that point comes early and fullness catches up with you later.
2. Spread protein across the day
Keep your protein target, but split it into smaller portions across three or four meals or snacks instead of one big steak dinner or a large shake. If sulfur burps are frequent, reduce the highest-sulfur sources for a while (eggs, red meat, whey protein) and lean on chicken, turkey, white fish, tofu and lentils in moderate portions. If you rely on protein shakes, try half servings, or look at a plant-based powder and see whether it’s better tolerated. My article on protein powder and acid reflux goes through the options.
3. Cut back on other sulfur-heavy foods
Broccoli, cabbage, cauliflower, Brussels sprouts, garlic, onions, beer and wine all add to the sulfur load. You don’t need to avoid them for good. Just ease off during dose increases or bad weeks.
4. Keep fat low
Fat slows gastric emptying on its own, so a greasy meal on top of a GLP-1 drug keeps food in your stomach even longer. Fried food, creamy sauces and fatty cuts of meat are among the most common triggers. See fried food and acid reflux.
5. Skip fizzy drinks and eat slowly
Carbonated drinks add gas to a stomach that’s already holding plenty. Eating quickly makes you swallow extra air. Sip still water between meals rather than drinking large amounts with them.
6. Walk after meals and don’t lie down
A 10–15 minute walk after eating helps move food along, and staying upright for two to three hours after meals helps both burping and reflux. See walking after meals and how long before bed to stop eating.
7. Use Pepto-Bismol for bad days
Pepto-Bismol is the one over-the-counter product that targets the smell itself. The bismuth binds hydrogen sulfide and turns it into odorless bismuth sulfide. There’s no known direct interaction with semaglutide or tirzepatide. Keep it for occasional use, though, because it also contains a salicylate related to aspirin. Dose, timing and who should avoid it are in Pepto-Bismol for sulfur burps. Gas-X (simethicone) may help with bloating but doesn’t remove the sulfur smell.
8. Talk to your prescriber about the dose
If sulfur burps are frequent and not settling, slowing your dose increases or staying on a lower dose longer is a common and reasonable adjustment. Don’t change the dose yourself, but do ask.
GLP-1s, Sulfur Burps and Acid Reflux
Sulfur burps on these drugs rarely come alone. The same slow stomach that ferments food also increases pressure and makes reflux more likely. On the Wegovy label, GERD was reported by 5% of people on the drug vs 3% on placebo, and dyspepsia by 9% vs 3%. Burping itself can carry acid and stomach contents up with it, which matters if you have throat-based silent reflux. I cover this in detail in Ozempic and reflux, Mounjaro and acid reflux and GLP-1s and silent reflux. If you need acid medication alongside your GLP-1, see omeprazole or famotidine with Ozempic and Mounjaro.
The helpful part is that the changes that reduce sulfur burps (smaller meals, less fat, earlier dinners, no carbonation) are the same ones that calm reflux. That’s the basis of the Wipeout Diet Plan.
Sulfur Burps With Diarrhea or Vomiting on a GLP-1
Diarrhea is one of the most common GLP-1 side effects (30% on Wegovy vs 16% on placebo), so having both at once isn’t unusual during dose increases. It usually settles on its own. If sulfur burps and diarrhea continue for more than a few days, especially after travel, it’s worth ruling out other causes like giardia. See sulfur burps and diarrhea.
Contact your prescriber or seek care promptly if you have:
- Repeated vomiting, or you can’t keep fluids down
- Vomiting food you ate many hours earlier, a sign the stomach is emptying very slowly
- Severe or persistent abdominal pain, especially pain that spreads to your back (pancreatitis) or pain in the upper right side (gallbladder), both listed as warnings for this drug class
- Signs of dehydration: dizziness, very dark urine, or passing very little urine
- Blood in your vomit or stool, or black stools you can’t put down to Pepto-Bismol or iron
Also, always tell your care team you’re on a GLP-1 before any procedure that needs sedation or anesthesia, because food may still be in your stomach despite fasting.
Conclusion
Sulfur burps on Ozempic, Wegovy, Mounjaro and Zepbound come from the way these drugs work. They slow your stomach, food sits and ferments, and bacteria turn the sulfur in protein into hydrogen sulfide that comes back up. They’re most common during dose increases and in the days after each injection, and they usually settle as your body adapts. The fixes are smaller meals, protein spread through the day, fewer sulfur-heavy foods and shakes, less fat, no fizzy drinks, a walk after eating, and Pepto-Bismol for bad days.
Almost all of those fixes are about how you eat: meal size, timing, fat and protein load. That’s what the Wipeout Diet Plan is built around. It’s a structured, mechanism-first plan that gives a slow stomach less to deal with at once, which cuts down both the fermentation behind sulfur burps and the reflux that often comes with it on these drugs. I built it originally around LPR and silent reflux, the stubborn throat-based form, but because it targets the same digestive mechanisms, it works just as well for GERD, heartburn and the burping and bloating that GLP-1s bring.
If you want a simpler place to start, the Wipeout Food Reference Guide is the essential companion. It lists foods and drinks that suit acid reflux and LPR, with their pH values, so you can build gentler, smaller meals that a slower stomach can handle.
The drug slows your stomach down, so your meals need to be smaller and gentler to match.
Frequently Asked Questions
Why does Ozempic give me sulfur burps?
Ozempic (semaglutide) slows stomach emptying, so food, especially protein, sits longer and ferments. Bacteria break down the sulfur in that food and release hydrogen sulfide, which comes up as rotten-egg burps. The same happens with Wegovy, Rybelsus, Mounjaro and Zepbound.
How do I get rid of sulfur burps from Mounjaro or Zepbound fast?
Pause eggs, red meat, protein shakes and cruciferous vegetables for a day or two, eat small low-fat meals, avoid fizzy drinks, and walk after eating. Pepto-Bismol can help on bad days because it binds the sulfur gas. If they’re frequent, ask your prescriber about slowing your dose increases.
How long do sulfur burps last on Mounjaro?
They’re usually worst in the first few weeks after starting or after a dose increase, and in the day or two after each injection. The stomach-slowing effect partly wears off over time, so most people find they settle after a few weeks on a stable dose. If they last beyond a month or two at the same dose, speak to your prescriber.
Do sulfur burps mean Ozempic or Zepbound is working?
Not exactly. They’re a sign that your stomach is emptying more slowly, which is part of how these drugs work, but you don’t need sulfur burps for the drug to be effective. Many people lose weight without them, and reducing them with diet changes doesn’t make the drug less effective.
Is Zepbound or Ozempic worse for sulfur burps?
There’s no head-to-head data on sulfur burps specifically. Both slow gastric emptying and both list burping as a side effect, at broadly similar rates. Your dose, how quickly it was increased, and what you eat matter more than which drug you’re on.
Can I take Pepto-Bismol with Ozempic or Mounjaro?
There’s no known direct interaction, and it’s useful for an occasional bad day. It contains a salicylate related to aspirin, though, so avoid it if you’re allergic to aspirin, take blood thinners, are pregnant, or have kidney disease, and don’t use it for more than two days in a row.
When should I worry about sulfur burps on a GLP-1?
Get medical advice if they come with repeated vomiting, vomiting food eaten many hours earlier, severe or persistent stomach pain, signs of dehydration, or blood in your vomit or stool. These can point to more serious complications like severely delayed gastric emptying, pancreatitis or gallbladder problems.
Research & References
- Review of how GLP-1 receptor agonists and tirzepatide delay gastric emptying, including evidence that the effect of long-acting agents partly wears off with continued use [Jalleh et al., Journal of Clinical Endocrinology and Metabolism, 2024].
- Retrospective analysis finding residual gastric content at upper endoscopy in 24.2% of semaglutide users, compared with 5.1% of non-users [Silveira et al., Journal of Clinical Anesthesia, 2023].
- Wegovy prescribing information: eructation in 7% of patients vs <1% on placebo, diarrhea 30% vs 16%, dyspepsia 9% vs 3%, GERD 5% vs 3%, with GI reactions most frequent during dose escalation [U.S. Food and Drug Administration, Wegovy Prescribing Information, 2025].
- Zepbound prescribing information: eructation in 4–5% of patients vs 1% on placebo, with most GI events occurring during dose escalation and decreasing over time [U.S. Food and Drug Administration, Zepbound Prescribing Information, 2026].
David Gray
12 years living with LPR · Consultant & researcher
I've lived with LPR for twelve years — the misdiagnoses, the PPI courses that did nothing, the slow work of figuring out what actually helps. Wipeout Reflux is where I translate the research into plain terms for people stuck in the same place. Every claim here is sourced to peer-reviewed work, and I consult one-to-one with LPR sufferers.