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Home/Guides & Tips/Medications/

Mounjaro and sulfur burps

Sulphur burps on Mounjaro: Learn everything you need to know

Mounjaro can be a gamechanger for weight loss, but some users report an unexpected side effect—sulphur burps that smell like rotten eggs. Here’s why they happen, how long they might last and what you can do to get rid of them.

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Medically reviewed by:

Dr Earim Chaudry (MBBS), Chief Medical Officer

iconPublished 20th February 2025
Research-Based Guide
Table of contents
  • What are sulphur burps?
  • Can Mounjaro cause sulphur bur...
  • How long do sulphur burps last...
  • How to stop sulphur burps on M...
  • When to seek medical help
  • Your weight loss journey

It’s true that Mounjaro weight loss injections can come with side effects, like nausea, constipation and…eggy burps?

Yep—it’s a thing, we’re afraid. Certainly more of thing than "Ozempic face" anyway. Officially, these are called sulphur burps, and they smell like rotten eggs thanks to the hydrogen sulphide gas that causes them.

While egg burps aren’t exactly pleasant, the good news is that they’re not usually something to be too worried about. That said, it’s perfectly understandable that you would want to get rid of them! Here’s what you need to know about Mounjaro and egg burps—and how to make them go away.

What are sulphur burps?

Sulphur burps aren’t listed as one of the main Mounjaro side effects, but some people do report them. The cause of sulphur burps on Mounjaro may be the medicine’s effect on the gut.

One of the ways that Mounjaro works to make you feel full is slowing down your rate of digestion. That means that food sits in your stomach for longer, which allows for more H2S gas to build up.

There’s also a theory that Mounjaro might affect the makeup of bacteria that live in your gut, which could potentially play a role here as well. But we don’t fully understand how Mounjaro impacts gut bacteria, so we can’t say for sure just yet.

Can Mounjaro cause sulphur burps?

Okay, but what causes sulphur burps on Mounjaro? It may be down to the medicine’s effect on the gut.

One of the ways that Mounjaro works to make you feel full is slowing down your rate of digestion. That means that food sits in your stomach for longer, which allows for more gas to build up.

There’s also a theory that Mounjaro might affect the makeup of bacteria that live in your gut, which could potentially play a role here as well. But we don’t fully understand how Mounjaro impacts gut bacteria, so we can’t say for sure just yet.

FYI: up to one in ten people might experience burping as a Mounjaro side effect.

How long do sulphur burps last?

It’s hard to say because everyone’s different, but gut-related side effects tend to come on when your dose increases and clear over time.

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How to stop sulphur burps on Mounjaro

Sulphur burps are usually harmless and aren’t a sign that the medicine isn’t working or Mounjaro isn’t safe.

But if you just want them out of your life, here’s the advice on how to get rid of sulphur burps on Mounjaro.

Know which foods to eat and avoid

The main recommendation is to adjust your diet on Mounjaro. We know that foods containing sulphur trigger H2S production, so it might help to avoid them.

That includes:

  • Red meat
  • Cow’s milk
  • Eggs
  • Onions
  • Fried foods
  • Cruciferous vegetables (like broccoli, cabbage, kale, and Brussels sprouts).

Some research suggests that fibre can bring H2S levels down, and that eating protein without having enough fibre in your diet can make them rise. You want both in a healthy diet, anyway.

And it’s worth avoiding alcohol on Mounjaro as it can make gut side effects worse. If you can, it’s always best to get personalised diet advice from your provider (like us!).

Eat smaller meals, more often

This might help reduce the buildup of gas in your gut. Because gas forms when food is being digested, having less food in your stomach may mean you have less gas. And, therefore, you wouldn’t burp as much.

Move your body

Mild exercise has been shown to help move digestion along and prevent gas from collecting in the gut. Exercise is great for you in any case, so try to do two strength sessions and 150 minutes of moderate-intensity movement each week.

Probiotics

Probiotics are ‘good’ bacteria that can influence the balance of other bacteria in your gut. It’s been suggested that they could help to regulate H2S levels, which might in turn pair back your burps. Do check in with your provider before trying this, as probiotics aren’t recommended for everyone.

In summary:

Do’s
vs
Don’ts
Do eat smaller, more frequent meals.
vs
Don’t overeat.
Do choose easy-to-digest foods.
vs
Don’t eat sulphur-rich foods.
Do try probiotics.
vs
Don’t drink carbonated drinks.
Do move your body.
vs
Don’t skip meals.

When to seek medical help

We get that you might be a little grossed out by your burps, but they’re usually not a sign of anything serious.

But if your burping is intense enough to affect your day-to-day activities on more than three days per week, you should check in with your doctor. Sometimes, excessive burping can be due to another condition like gastrointestinal reflux disease, IBS or anxiety.

Having other symptoms alongside your burps, like a fever or vomiting, that are severe or don’t go away also warrants a visit to your doctor.

Side effects support at Voy

"If you're using Voy and you experience any side effects, rest assured that our expert clinicians are just a message or phone call away. They can adjust your dose, prescribe medication to ease your symptoms, or simply offer reassurance.

Everyone responds differently to weight loss treatment and we'll help you find what feels right for you."

Phoebe Fox - Weight Loss Specialist Clinician

Your weight loss journey

Weight loss medications can drive serious results, though they can also come with not-so-glamourous side effects (yet most of the time these are mild and clear on their own). But for people who have tried to lose weight another way and didn’t see the results they wanted, weight loss injections can be a gamechanger.

With weight loss medication and healthy lifestyle changes, you could lose up to 25% of your starting weight if you stick with your routine for over a year.

You can get medication, plus personalised support from our team at every step, as part of our weight loss programme. We’ll be on hand to answer your questions and celebrate your success.

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FAQ

Mounjaro sulphur burps: FAQ

Dr Earim Chaudry, MBBS
DisclaimerAt Voy, we ensure that everything you read in our blog is medically reviewed and approved. However, the information provided is not meant to replace professional medical advice, diagnosis, or treatment. It should not be relied upon for specific medical advice.
References
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Dordević, Dani, et al. “Hydrogen Sulfide Toxicity in the Gut Environment: Meta-analysis of Sulfate-reducing and Lactic acid Bacteria in Inflammatory Processes.” Journal of Advanced Researchscribble-underline, vol. 27, 2021:55-69 www.sciencedirect.com/science/article/pii/S2090123220300527?via%3Dihub.

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Teigen, Levi, et al. “Impact of diet on hydrogen sulfide production: implications for gut health.” Current Opinion in Clinical Nutrition and Metabolic Care,scribble-underline vol. 26, no. 1, 2023:55-58 https://journals.lww.com/co-clinicalnutrition/abstract/2023/01000/impact_of_diet_on_hydrogen_sulfide_production_.11.aspx.

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Villoria, Albert, et al. “Physical Activity and Intestinal Gas Clearance in Patients with Bloating.” The American Journal of Gastroenterologyscribble-underline, vol. 101, no. 11, 2006:2552-2557 https://journals.lww.com/ajg/abstract/2006/11000/physical_activity_and_intestinal_gas_clearance_in.18.aspx.

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