If you’re taking Mounjaro (Tirzepatide) and suddenly find yourself dealing with burps that smell a bit… off (like rotten eggs), you're not alone. These so-called sulphur burps can be an unpleasant side effect but let’s take a look at why they happen, what triggers them, and what you can do to feel better.
What are Mounjaro sulphur burps?
Sulphur burps are caused by the release of hydrogen sulphide gas in the digestive system - hence the distinctive eggy smell. While they can occur when taking Mounjaro, these burps aren’t unique to the medication. Other digestive issues or dietary triggers can lead to them too.
Are sulphur burps a common side effect of Mounjaro?
Although sulphur burps aren’t listed as a typical side effect, digestive symptoms are quite common with Mounjaro. These may include:
- Nausea
- Diarrhoea
- Constipation
- Vomiting
- Indigestion
- Bloating or abdominal pain
In clinical trials, burping was reported more frequently in people taking Mounjaro, affecting up to 3.3% of participants, compared with just 0.4% in those given a placebo. Although the sulphur smell wasn’t specifically measured, the way Mounjaro works by initially slowing down digestion may contribute to it.
What causes Mounjaro sulphur burps?
Mounjaro activates GLP-1 and GIP receptors, which help regulate blood glucose and increase the feeling of fullness. One of the effects of these hormones is that they slow down how quickly your stomach empties.
This delayed stomach emptying can cause food to remain in your stomach for longer, leading to fermentation and the build-up of gases, such as hydrogen sulphide, which causes that unpleasant odour.
How to treat Mounjaro sulphur burps
The good news is there are simple steps that may help reduce (or even prevent) sulphur burps:
1. Watch what you eat
Some foods are more likely to cause gas, especially when digestion is slower:
- High-sulphur foods: garlic, onions, broccoli, cauliflower, eggs, meat, dairy
- Sugar and sugar alcohols (like those found in sugar-free gums or sweets)
- High-fibre foods such as beans, lentils, nuts and seeds
2. Stay well hydrated
Drinking plenty of water can help move gas through your system and support digestion.
3. Eat smaller, more frequent meals
Large meals can overload your digestive system. Try spreading meals out across the day to ease the burden on your stomach.
4. Gentle movement helps
Even a short walk after eating can support digestion and reduce gas build-up.
5. Consider over-the-counter remedies
Some over-the-counter options that may help include:
- Simeticone (e.g. WindSetlers) – breaks down gas bubbles
- Bismuth subsalicylate (e.g. Pepto-Bismol) – can help with the smell
Always consult your GP or pharmacist before starting any new medications.
6. Limit alcohol
Alcohol can irritate your gut and slow digestion, which may make symptoms worse.
When to see your GP
Occasional sulphur burps are usually nothing to worry about. But it’s best to speak to your GP if you notice:
- Ongoing or worsening burping
- Persistent digestive symptoms (like nausea or vomiting)
- Unexplained weight loss
- Significant abdominal pain or bloating
Yes, sulphur burps can happen with Mounjaro, but they’re not inevitable. With some simple changes, you can often get them under control. If you’re feeling unsure or the symptoms are affecting your day-to-day life, reach out to our Phlo clinical team for advice and support.
