Sulfur Burps and Diarrhea on Mounjaro: Why They Happen and How to Track Them

Mounjaro acts on GLP-1 and GIP receptors, which play a role in regulating appetite and digestion. One well-documented effect is slower gastric emptying — food moves through the stomach more gradually than usual. When partially digested food and gases linger in the gut for longer, sulphur-containing compounds can build up and escape as eggy or sulfur-smelling burps. The same disruption to normal gut motility can also cause loose stools, stomach cramps, and diarrhea, particularly as the digestive system adapts to the medicine.

When Are These Symptoms Most Common?

Many people notice sulfur burps and diarrhea on Mounjaro in the 24–72 hours following an injection, or when a dose is increased. This timing makes sense given the way the medicine influences gastric emptying. Symptoms often become less frequent as the body settles into a new dose, though individual experience varies considerably. Stomach cramps alongside diarrhea are also commonly reported during this adjustment window.

General Observations That May Help

Some people find that eating smaller meals, reducing high-fat or very rich foods around injection day, and staying well hydrated is associated with milder symptoms — though what works varies from person to person. These are general observations, not medical instructions. For guidance specific to your situation, your prescriber or doctor is the right person to ask.

For more detail on loose stools and bowel changes specifically, see the pages on diarrhea on Mounjaro and managing diarrhea while on Mounjaro. For a closer look at the burping side of this experience, the page on sulphur burps on Mounjaro covers that in more depth. Both are part of a broader overview of Mounjaro side effects.

One of the most useful things you can do with recurring digestive symptoms is spot the pattern — when they appear relative to your injection day, how long they last, and whether they seem connected to particular foods or dose changes. GLP Trackr's side-effect tracker lets you log symptoms like sulfur burps, diarrhea, and stomach cramps each day, so you build up a clear picture over time rather than trying to recall details weeks later.

That logged history becomes genuinely useful when you see your prescriber. Instead of a rough impression of how things have been, you can bring a concrete record of which days were difficult, how severe symptoms felt, and how they trended across dose changes. The doctor report feature in the app makes it straightforward to pull this together before an appointment.

You can also use the daily check-in to note how your energy and overall wellbeing are holding up alongside digestive symptoms — helpful context if cramps and diarrhea are affecting your day-to-day comfort.

If your sulfur burps or diarrhea are severe, persistent, or accompanied by pain that worries you, contact your healthcare professional promptly rather than waiting. GLP Trackr helps you record and organise what you are experiencing — it is not a substitute for clinical advice, and any decision about your treatment belongs with your prescriber.

Start logging your symptoms and see your own patterns emerge — GLP Trackr is available on the App Store and Google Play, with a free 7-day trial to get started.