How Long Do Sulfur Burps Last with Mounjaro?

Mounjaro works on GLP-1 and GIP receptors involved in appetite regulation and digestion. One well-documented effect is slower gastric emptying — food moves through the stomach more gradually than usual. This slower digestive process can allow gas to build up, and some of that gas carries a sulfur-like odour, resulting in the burps many people describe.

When do they typically appear?

Many people find sulfur burps show up in a recognisable window — often within the first day or two after their weekly injection, or shortly after eating. They tend to settle within a few days as digestion returns closer to its usual rhythm between doses. For some, they become less frequent as the body adapts over several weeks on a particular dose; for others, they may return each time the dose is increased.

What might make them worse?

• Eating large meals or eating quickly, which can put extra pressure on a slower-moving digestive system
• Foods high in sulfur compounds — such as eggs, red meat, cruciferous vegetables (broccoli, cabbage, cauliflower), and garlic — may intensify the effect for some people
• Fizzy drinks or carbonated beverages can add to gas build-up
• Lying down shortly after eating

These are observations commonly reported by people on GLP-1 medicines — they aren't a reason to change your diet without discussing it with your prescriber or doctor first. If sulfur burps are severe, persistent, or accompanied by other symptoms such as significant nausea, vomiting, or abdominal pain, contact your healthcare professional promptly rather than waiting to see if they resolve.

For more on the broader range of digestive and other side effects associated with Mounjaro, see the Mounjaro side effects overview. You may also find it useful to read about sulfur burps and Mounjaro in more detail, or explore what people commonly notice about Mounjaro and sulfur burps over time.

One of the most useful things you can do when a side effect like sulfur burps keeps appearing is to log it — because patterns that are hard to spot in the moment become obvious when you look back over a few weeks of data.

GLP Trackr's side-effect tracker lets you record symptoms as they happen, including when they started, how uncomfortable they were, and how long they lasted. Over time, the app helps you see whether your burps are tied to a particular day in your injection cycle, a certain type of meal, or a specific dose level. That kind of personal insight is genuinely useful to bring to your next prescriber appointment — far more useful than trying to recall it from memory.

Alongside side-effect logging, the food logging feature (including an AI photo scan for quick meal capture) makes it easy to notice whether certain foods seem to coincide with worse symptoms. You can log what you ate and when, then cross-reference with how you felt — without any guesswork.

GLP Trackr is a tracking companion, not a substitute for your prescriber's advice. If your sulfur burps are severe, persistent, or feel different from usual, always follow the guidance of your healthcare professional — they know your full history. The app helps you record what's happening so those conversations are as informed as possible.

You can also read more about how long sulphur burps typically last on Mounjaro for additional context.

Start logging your symptoms and spotting your own patterns — GLP Trackr is available free on the App Store and Google Play, with a 7-day trial so you can see how it fits your journey.