Eggy Burps on Mounjaro: Why They Happen and What You Can Do

The most widely reported explanation is linked to how Mounjaro affects the digestive system. Tirzepatide acts on GLP-1 and GIP receptors, which — among other effects — slows gastric emptying. When food moves through the stomach more slowly, it spends longer fermenting, and this can produce hydrogen sulphide gas, which is responsible for the distinctive eggy smell.

This effect is not unique to Mounjaro. sulphur burps on similar GLP-1 medicines are also commonly reported, and the underlying mechanism is broadly the same. The slower the digestive process, the more opportunity there is for gas to build up before it is expelled.

When are they most likely?

• Shortly after dose increases — many people find symptoms are more noticeable in the days immediately following a step up in dose, then gradually settle.
• After eating certain foods — high-sulphur foods such as eggs, red meat, cruciferous vegetables (broccoli, cabbage, cauliflower), and garlic may make eggy burps worse. Some people also find fizzy drinks and high-fat meals a trigger.
• When meals are eaten quickly or in large portions — on Mounjaro, smaller, slower meals are often better tolerated.

For a broader look at burping on Mounjaro generally, including other types of belching and what typically helps, that page covers the topic in more depth. You can also read more about eggy burps and Mounjaro for further detail on patterns people commonly report.

According to NHS guidance, gastrointestinal side effects including nausea, indigestion, and burping are among the most commonly reported effects of medicines in this class.

One of the most useful things you can do when a side effect like this keeps appearing is to log it consistently — noting when it happens, how long it lasts, and what you ate beforehand. Over time, patterns often emerge that are genuinely hard to spot otherwise.

GLP Trackr's side-effect tracker lets you record symptoms like eggy burps each day, so you build up a clear picture of how they relate to your dose schedule, your meals, or other factors in your routine. If you notice they spike after certain foods, that is useful information to act on — and to bring to your prescriber. The app's food logging feature (including a quick AI photo scan of your meals) can sit alongside your symptom log, making it easy to spot whether high-sulphur foods are a consistent trigger for you specifically.

When your next appointment comes around, the data you have logged can make for a much more informative conversation with your prescriber rather than relying on memory alone.

If eggy burps are severe, persistent, or accompanied by other digestive symptoms that concern you, contact your healthcare professional promptly — GLP Trackr is a tracking tool to support those conversations, not a substitute for clinical advice. Any questions about your dose or treatment plan should always be directed to your prescriber or doctor, who knows your full history. You can find a full overview of reported effects on the Mounjaro side effects guide.

Start logging your symptoms and meals in one place — GLP Trackr is free to try for 7 days on the App Store and Google Play.