Mounjaro and Sulfur Burps: Why They Happen and What to Do

Mounjaro works on GLP-1 and GIP receptor pathways, and one of its well-known effects is slowing down how quickly the stomach empties — a process sometimes called delayed gastric emptying. When food moves through the digestive tract more slowly than usual, it spends more time fermenting, which can produce hydrogen sulphide gas. That gas is what causes the characteristic rotten-egg smell associated with sulfur burps.

This effect on stomach emptying often reduces over time, particularly once your body has had several weeks to adjust to a given dose. A dose increase can temporarily bring symptoms back, which is why many people notice sulfur burps most strongly in the days following a step-up in their treatment plan.

Other digestive symptoms often reported alongside sulfur burps

Sulfur burps rarely appear in isolation. People commonly report them alongside other gastrointestinal symptoms such as nausea, bloating, constipation, or a general sense of sluggish digestion. If you are experiencing a cluster of these symptoms, it can be helpful to keep a log — noting when they occur, how severe they feel, and whether they seem linked to meals, hydration, or dose timing. You can read more about the broader picture of Mounjaro side effects, or explore specific guidance on sulfur burps on Mounjaro and sulfur-related digestive symptoms on Mounjaro.

From a dietary angle, some foods are more likely to contribute to sulphur gas production — eggs, red meat, garlic, onions, cruciferous vegetables (such as broccoli and cabbage), and high-protein foods in general. This does not mean avoiding them, but being aware of patterns around your diet and symptoms can be genuinely useful information to bring to your prescriber.

One of the most practical things you can do when managing a side effect like sulfur burps is to track it consistently — not to self-treat, but to build a clear picture of your own experience over time.

GLP Trackr's side-effect tracking feature lets you log symptoms like sulfur burps, bloating, or nausea each day, so you can see whether they follow a pattern: perhaps peaking a day or two after your weekly injection, or correlating with certain meals. That kind of logged history is far more useful in a prescriber appointment than trying to recall how you felt three weeks ago.

Alongside symptom logging, the app's food diary — including AI photo scan and barcode logging — makes it straightforward to track what you ate around the time symptoms appeared. If sulfur-rich foods or large meals seem to be a factor for you personally, having that data to hand can help you and your prescriber make sense of the pattern. You can also explore the detailed guide to sulfur burps on Mounjaro for more context on what others commonly experience.

GLP Trackr brings your symptom notes, food logs, and dose history together in one place — making it easier to have an informed conversation with your healthcare team rather than going in with fragments of memory.

If your sulfur burps are accompanied by severe or persistent abdominal pain, vomiting, or any symptom that feels worrying, contact your healthcare professional promptly. Any decision about managing side effects or adjusting your treatment belongs with your prescriber, who knows your full medical history — GLP Trackr is a tracking tool to support those conversations, not a substitute for them.

Ready to start spotting your own patterns? Download GLP Trackr on the App Store or Google Play — your first seven days are completely free.