Why do I have sulfur burps (rotten-egg burps) on a GLP-1?
The short answer: Those rotten-egg burps come from food sitting longer in a slowed-down gut — unpleasant, usually harmless, and manageable. This is a common and much-discussed GLP-1 complaint.
Why it happens
Because your stomach empties more slowly on a GLP-1, food (especially protein and fatty meals) lingers and ferments longer. That fermentation produces hydrogen sulfide gas — the same compound that makes rotten eggs smell — which comes back up as sulfur burps.
It often clusters after larger or richer meals and after dose increases, when digestion is slowest.
How long it lasts
It tends to come and go with meals rather than being constant, and usually eases as your body adjusts to a dose. Larger, fattier meals reliably make it worse.
What helps
- Eat smaller portions and avoid very fatty or heavy meals
- Slow down — don't gulp air with food or drink
- Stay hydrated and keep moving after meals to help digestion
- Some people find fewer sulfur-rich foods (eggs, red meat, garlic, onions) helps
Nutrition tips
- Reduce very high-fat and heavy meals
- Space out large protein loads
- Avoid trigger foods you notice
What may make it worse
- Very large or high-fat meals
- Meals heavy in sulfur-rich foods (eggs, red meat, garlic, onions) if you notice a pattern
- Carbonated drinks that add swallowed air
- Eating quickly and swallowing air
When it peaks and fades
Typical intensity reported by GLP-1 users over the first 3 months
Typical intensity over time
Urgent warning signs — seek emergency care
Any of the signs below can indicate a serious medical event. Call your local emergency number or go to the nearest urgent care.
- Sulfur burps together with persistent vomiting and inability to keep fluids down
- Severe abdominal pain, especially pain that radiates to the back
- Belly bloating with NO passing gas and NO bowel movement (possible obstruction)
When to contact your prescriber
These are not emergencies but do warrant a call or a message to your prescribing clinician.
- Sulfur burps that persist for more than a few days despite smaller, plainer meals
- New sulfur burps after a dose increase that are not settling
Track this against your dose. Logging sulfur burps week by week shows whether it's actually easing — and gives your prescriber real data.
Related symptoms
Sources
- Wegovy (semaglutide) Prescribing InformationU.S. Food & Drug Administration (FDA). 2023.
- Ozempic (semaglutide) Prescribing InformationU.S. Food & Drug Administration (FDA). 2025.
Related in your GLP-1 journey
Full GLP-1 hub →Educational information from Calqulate.net — not medical advice, diagnosis, or treatment. Follow your prescriber's instructions and contact a licensed clinician about your symptoms.
Frequently Asked Questions
Common questions and answers about this calculator.
Why do I have sulfur burps (rotten-egg burps) on a GLP-1?
Those rotten-egg burps come from food sitting longer in a slowed-down gut — unpleasant, usually harmless, and manageable.
How long does it last?
It tends to come and go with meals rather than being constant, and usually eases as your body adjusts to a dose. Larger, fattier meals reliably make it worse.
When should I be worried?
Contact your prescriber or seek care if: Sulfur burps that persist for more than a few days despite smaller, plainer meals; New sulfur burps after a dose increase that are not settling.
