Why Mounjaro Can Cause Sulphur Burps
Tirzepatide acts on GIP and GLP-1 receptors, which — among other effects — slows the rate at which the stomach empties. When food moves through the digestive system more slowly, bacteria in the gut have a longer window to ferment it. That fermentation can produce hydrogen sulphide and other sulphur-containing gases, which are then released as burps with a characteristic rotten-egg odour.
When are they most common?
Sulphur burps are most frequently reported in the days immediately following a dose or a dose increase. The effect often settles once the body adapts to a given dose level, though it can return with each upward step in titration. They sometimes arrive alongside other gastrointestinal symptoms — including diarrhoea, nausea, or stomach discomfort — which reflects the broader impact slower gastric emptying can have on the whole digestive tract.
Are they the same on Wegovy?
Sulphur burps are also reported by people taking semaglutide-based medicines. Because both work on the GLP-1 pathway and both slow gastric emptying, the underlying mechanism is similar. You can read more about sulphur burps on Wegovy if that is relevant to your situation, or explore the broader picture of Mounjaro side effects for context on how this symptom fits alongside others.
When should you contact a healthcare professional?
Sulphur burps on their own are generally considered a nuisance rather than a warning sign. However, if they are accompanied by severe or persistent stomach pain, vomiting you cannot control, or symptoms that feel unusual or worrying to you, contact your prescriber or doctor promptly. They are best placed to assess whether anything further needs attention.
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Tracking Sulphur Burps and Digestive Symptoms with GLP Trackr
One of the most useful things you can do when a side effect like sulphur burps appears is to log it consistently — noting when it happens, how severe it feels, and whether it coincides with a dose day, a particular food, or a change in your schedule. That kind of record turns a vague, hard-to-describe experience into something concrete you can discuss with your prescriber.
GLP Trackr's side-effect tracker lets you log symptoms — including digestive ones like burping, stomach discomfort, and diarrhoea — each day and review how they change over time. The app's insights feature can help you spot patterns: for example, whether symptoms tend to peak on the day after your injection or ease off mid-week. That information is genuinely useful to bring to a prescriber appointment, especially if you are considering whether a dose adjustment is right for you.
You can also use the daily check-in to note your energy and how you are feeling overall, which helps build a fuller picture of how your body is responding at different stages of your journey. For more on how individual symptoms like these sit within the wider side-effect experience, the page on managing sulphur burps on Mounjaro covers practical observations in more detail, and our overview of common Mounjaro side effects provides broader context.
GLP Trackr is a tracking tool, not a substitute for clinical advice. If your symptoms are severe, persistent, or changing in a way that concerns you, always speak with your prescriber or doctor — they know your full medical history and are the right person to guide any decisions about your treatment.
Start logging your symptoms and spotting your own patterns — GLP Trackr is free to try for 7 days on the App Store and Google Play.
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Frequently asked questions.
Mounjaro (tirzepatide) slows gastric emptying, giving gut bacteria more time to ferment food and produce sulphur-containing gases. This is what causes the characteristic eggy smell. The effect is most noticeable after a dose increase and often settles as the body adjusts.
Yes, experiencing both sulphur burps and diarrhoea on Mounjaro is commonly reported. Both symptoms relate to how the medicine affects digestion and gastric emptying. They often ease over time, but if symptoms are severe or persistent, speak with your prescriber or doctor.
For many people, sulphur burps are most noticeable in the first few days after starting or increasing a dose, and ease within a week or so. However, they can return with each dose increase during titration. Everyone's experience is different, and your prescriber can help if they persist.
Many people find that tracking when burps occur — in relation to dose days and food choices — helps identify personal patterns. Any decisions about managing symptoms, including dietary or medication changes, should be discussed with your prescriber or doctor rather than self-managed.
Yes. GLP Trackr's side-effect tracker lets you log digestive symptoms, note their severity, and review patterns over time. You can use this record to have a more informed conversation with your prescriber about how your body is responding to the medication.