What Causes Sulphur Burps on Mounjaro?
Mounjaro works as a dual GIP and GLP-1 receptor agonist, and one of its well-documented effects is slowed gastric emptying — food moves through the stomach more slowly than usual. When digestion is delayed, sulphur-containing compounds in foods such as eggs, red meat, cruciferous vegetables, and high-protein products have longer to ferment in the gut. The resulting hydrogen sulphide gas is what produces that distinctive rotten-egg smell and taste.
This is not a sign that anything has gone seriously wrong. Slower gastric emptying is part of how the medicine works, and the digestive system typically takes several weeks to adapt, especially during the early titration stages. That said, if burping is accompanied by severe or persistent abdominal pain, vomiting, or anything that feels unusual or alarming, contact your prescriber or doctor promptly — do not wait for your next scheduled appointment.
Foods that commonly make it worse
- Eggs and egg-based dishes
- Cruciferous vegetables (broccoli, cauliflower, cabbage, Brussels sprouts)
- Red meat and high-sulphur protein powders
- Carbonated drinks, which add extra gas
- Eating large portions in one sitting, which worsens delayed gastric emptying
Many people find that smaller, more frequent meals and reducing high-sulphur foods during the first few days after a dose helps ease the symptom. This is general observational information, not personalised dietary advice — your prescriber or a registered dietitian can give guidance tailored to your situation.
For a broader look at the digestive and other side effects associated with tirzepatide, the full Mounjaro side effects overview covers the wider picture. If you are also curious how this compares on a different medicine, see our page on sulphur burps on Wegovy.
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Tracking Sulphur Burps with GLP Trackr
One of the most useful things you can do when managing any recurring side effect is to spot its pattern — when it peaks, how long it lasts, and whether it links to certain foods or dose timing. GLP Trackr's side-effect tracking feature lets you log symptoms like sulphur burps each day, so over time you can see exactly when they tend to flare and whether they are gradually easing.
Pair that with the food logging tools — including an AI photo scan that identifies what you have eaten without manual entry — and you can start to connect specific meals with symptom spikes. That kind of personal data is genuinely useful to bring to a conversation with your prescriber.
You can also log each dose and its date directly in the app, which makes it straightforward to see whether your symptoms cluster around injection day — a pattern many users notice. For more detailed guidance on managing this specific symptom, take a look at our page on ways to help with sulphur burps on Mounjaro, or visit our dedicated Mounjaro sulphur burps page for additional context.
GLP Trackr is a tracking and journaling tool — it records what you experience so you can have better-informed conversations with your healthcare team. It is not a substitute for clinical advice, and any concerns about persistent or severe symptoms should always be directed to your prescriber or doctor.
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Frequently asked questions.
Mounjaro slows gastric emptying, meaning food stays in the stomach longer. This gives sulphur-containing foods more time to ferment, producing hydrogen sulphide gas — the cause of that egg-like smell and taste. It is a commonly reported effect, particularly around dose increases.
Yes, they are commonly reported by people taking Mounjaro, especially in the early weeks or after a dose change. They are linked to the medicine's effect on digestion. If burps are accompanied by severe or persistent abdominal pain, speak to your prescriber or doctor promptly.
For many people, sulphur burps are most noticeable in the days following a dose and tend to ease as the body adjusts — often over several weeks. Everyone responds differently, and the pattern can change with each dose stage. Your prescriber can advise if they persist.
Foods high in sulphur — such as eggs, cruciferous vegetables (broccoli, cabbage), red meat, and some protein powders — are commonly linked to worse sulphur burps. Large meals and carbonated drinks can also aggravate the symptom. Smaller, spaced-out meals may help.
GLP Trackr lets you log symptoms including burping each day, alongside your food and dose information. Over time, this reveals patterns — such as whether symptoms peak after certain meals or on injection day — which you can discuss with your prescriber or doctor.