Sulphur Burps on Mounjaro: Causes & Prevention

Sulphur burps are burps that smell like rotten eggs, often leaving an unpleasant taste in the mouth, and are generally a common, harmless digestive issue.

Sulphur burps are caused when the medication slows down your digestion.

When food moves more slowly through your stomach and intestines, it gives bacteria more time to break it down, producing hydrogen sulphide gas, which is what causes that eggy smell.

Certain foods can make it worse, like:

• High-protein meals
• Eggs
• Cruciferous vegetables like broccoli or cabbage

Eating too quickly, skipping meals, or taking supplements can also add to the problem.

It’s usually not dangerous, but it can be uncomfortable and a little embarrassing, which is why understanding the cause is the first step in managing it.

The good news is that sulphur burps usually don’t last forever.

For most people, these “eggy burps” appear early in treatment, often in the first few days or weeks as your body adjusts to Mounjaro, and then gradually improve.

How long they last can depend on factors like your diet, meal timing, and how quickly your stomach empties. Some people notice the burps fade after a few weeks, while others may experience them occasionally for a bit longer.

Eat smaller, more frequent meals

Eating large meals can overwhelm your digestive system, especially when Mounjaro is slowing stomach emptying. By splitting your food into smaller portions throughout the day, you make it easier for your stomach to break down food, which reduces gas formation and the chances of sulphur burps.

Consider probiotics

Mounjaro can temporarily change the balance of bacteria in your gut. Probiotics, found in yoghurts or supplements, can help restore a healthy gut flora balance, which may lower the production of smelly gases that cause sulphur burps.

Dietary adjustments

Some foods naturally produce more gas when digested, particularly those high in sulphur, like eggs, beans, broccoli, cabbage, and cauliflower. Temporarily limiting these foods or pairing them with easy-to-digest options can help cut them down.

Chew slowly and mindfully

When you eat quickly, you swallow extra air, which can increase bloating and burping. Chewing food thoroughly and eating at a relaxed pace allows your stomach and intestines to process food more efficiently, which can reduce both the smell and frequency of burps.

Stay hydrated

Water helps food move smoothly through your digestive system. Drinking enough throughout the day, rather than large amounts all at once prevents food from lingering in the stomach, reducing fermentation by bacteria and decreasing sulphur gas production.

Check your supplements

Certain supplements, particularly iron, high-protein powders, or sulphur-containing vitamins, can make burps worse. Talk to your pharmacist about adjusting timing, switching formulations, or reducing doses to see if it helps.

Sulphur burps can be an uncomfortable but common digestive side effect when starting your treatment, and they often settle as your body adjusts.

However, persistent or severe digestive symptoms shouldn’t be ignored. It’s important to recognise when burping might be a sign that something else is going on and needs professional input.

You should speak to a pharmacist or doctor if sulphur burps are ongoing, worsening, or accompanied by other symptoms that suggest irritation or digestive distress.

Key symptoms to look out for

• Severe or persistent stomach pain
• Ongoing nausea or repeated vomiting
• Bloating that feels painful or unusual
• Diarrhoea lasting more than a few days
• Unintentional dehydration (dry mouth, dizziness, dark urine)
• Loss of appetite that doesn’t improve
• Burps combined with fever or feeling unwell

These symptoms don’t automatically mean something serious is happening, but they are a good reason to get checked early so you can stay safe and comfortable while continuing treatment.