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

Mounjaro works partly by slowing the rate at which food moves through the stomach — a process called delayed gastric emptying. When food lingers in the digestive tract for longer than usual, it has more time to ferment and produce hydrogen sulphide gas. That gas, when released as a burp, carries the distinctive sulphur smell most people describe as rotten eggs.

When are they most common?

Many people report sulfur burps most noticeably in the first day or two after an injection, or when moving to a higher dose. As the body adjusts to tirzepatide, this effect often becomes less pronounced — though it varies considerably from person to person.

Foods that may make them worse

Certain foods tend to produce more sulphur gas during digestion and may amplify the symptom. These commonly include high-sulphur vegetables such as broccoli, cauliflower, cabbage, and onions, as well as eggs and red meat. Eating very large meals — which is less common on Mounjaro but still possible — can also contribute by overwhelming a slower digestive system.

If you are experiencing other burping symptoms alongside this, it may be worth reading about belching and burping on Mounjaro more broadly, as the two are closely related. There is also useful context in our overview of sulphur burps on Mounjaro (alternative spelling) and a dedicated look at sulfur burps and Mounjaro covering common questions in detail.

For a wider picture of gastrointestinal effects associated with tirzepatide, the full Mounjaro side effects guide covers nausea, constipation, and other commonly reported symptoms.

One of the most practical things you can do when dealing with any recurring side effect is to notice its pattern — when it peaks, what seems to trigger it, and whether it is improving over time. GLP Trackr's side-effect tracker lets you log symptoms like sulfur burps each day, so you can see at a glance whether they cluster around injection day, correlate with certain foods, or gradually reduce as your body adjusts.

Because the app also includes food logging — including an AI photo scan that makes capturing meals effortless — you can start to connect what you ate with how you felt the following day. Over a few weeks, that data can reveal patterns that are genuinely useful to bring to a conversation with your prescriber.

If sulfur burps are persistent or bothering you, logging them consistently means you arrive at your next appointment with a clear record rather than a vague impression. GLP Trackr can even generate a summary you can share with your healthcare team.

A note on safety: Occasional sulfur burps are widely reported on GLP-1 medicines and are generally considered a nuisance rather than a warning sign. That said, if you are also experiencing severe or persistent abdominal pain, vomiting, or any symptom that feels unusual or worrying, contact your healthcare professional promptly — they know your full history and are best placed to advise you. GLP Trackr is a tracking tool, not a substitute for clinical guidance.

Log your symptoms, spot your patterns, and go into every prescriber conversation better informed. Download GLP Trackr on the App Store or Google Play and start your free 7-day trial today.