Sulphur Burps on Mounjaro: A Complete Guide

Mounjaro is a popular weight loss injection that has garnered an impressive reputation for delivering real results. Thanks to its classification as a dual agonist of hormone receptors, it is capable of resulting in a 22.5% drop in body weight after 72 weeks.

Much like all medications, Mounjaro can cause side effects in some people, with sulphur burps potentially being a common occurrence. The question is, what exactly are they?

This article outlines everything you need to know about sulphur burps on Mounjaro, such as what causes them, how long they last, and the actions you can take to stop them in their tracks. Let’s get started. 

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What Are Sulphur Burps?

Burping (or ‘eructation’) is a known side effect of Mounjaro, affecting approximately 3% of users. When these burps erupt with a potent eggy smell, they’re known as ‘sulphur burps.’ Sulphur burps aren’t explicitly listed as a Mounjaro side effect, but real-world reports suggest they are a common aspect of tirzepatide treatment.

Though not a cause for concern, sulphur burps can be unpleasant and inconvenient to deal with. So, why do you get sulphur burps on Mounjaro? How long do they last, and what can be done to alleviate this symptom?

Why Do You Get Sulphur Burps on Mounjaro?

Sulphur burps on Mounjaro may arise from its effect on the gastrointestinal tract. Tirzepatide, the active ingredient in Mounjaro, helps suppress appetite partly by delaying gastric emptying (i.e., by making food move more slowly through the stomach). This promotes a feeling of 'fullness' and helps reduce appetite, but also means food sits in the gut for extended periods.

Food that lingers in the gastrointestinal tract can start to ferment, leading to a build-up of hydrogen sulphide gas (H2S). This gas is harmless in small amounts but has a characteristic rotten-egg odour. Your body expels excess gas either via the anus (flatulence) or the mouth, and the latter exit route can produce Mounjaro sulphur burps.

What Else Causes Sulphur Burps?

Sulphur burps are often linked to Mounjaro, but they can have other causes. Excessive hydrogen sulphide production (the key culprit in sulphur burps) can also be a result of dietary choices.

Certain animal products, particularly red meats and processed meats, are rich in sulphur-containing amino acids. When fermented by gut bacteria, these foods release hydrogen sulphide, which is the odorous gas that contributes to sulphur burps.

In contrast, high-fibre foods like fruits, vegetables, legumes, and whole grains may reduce populations of sulfur-metabolising gut bacteria. Therefore, eating a plant-based diet may inhibit hydrogen sulphide production and reduce the incidence of sulphur burps on Mounjaro.

How Long Do Sulphur Burps Last on Mounjaro?

The most common side effects of Mounjaro, gastrointestinal symptoms, are most likely to occur at the start of treatment and after dose increases. Alongside Mounjaro sulphur burps, they include nausea, vomiting, and diarrhoea, and can persist for several days. However, studies of the side effects of Mounjaro have found that symptoms typically subside as your body adapts to the medication.

Therefore, many people find their sulphur burps dissipate after a few weeks of Mounjaro treatment. However, they may re-emerge when you increase your tirzepatide dose, along with other side effects.

How to Stop Sulphur Burps on Mounjaro

Sulphur burps can occur throughout Mounjaro treatment, as side effects often intensify during dose increases. Many Mounjaro users find the best way to navigate gastrointestinal symptoms is through dietary modifications, including adjustments to food choices and eating habits.

For example, avoiding red meat and processed meat may decrease H2S production in the gut, while opting for high-fibre foods may help to reduce burping. Certain foods may trigger your sulphur burps, and keeping a food diary can help you identify these.

Other clinical recommendations for managing gastrointestinal symptoms on weight loss injections include:

• Eat slowly 
• Eat only when hungry and stop when full
• Serve smaller portions
• Avoid lying down after a meal
• Don’t eat before bed
• Avoid exerting yourself after a meal
• Eat mindfully without distractions
• Sip drinks slowly and stick to clear fluids
• Avoid sugary, spicy, and fatty foods

If your side effects are severe or don’t improve with dietary adjustments, consult a healthcare professional for further advice.

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When to Seek Medical Help for Mounjaro Sulphur Burps

For most people, Mounjaro sulphur burps are a temporary inconvenience that subsides as their digestive system adjusts to the medication. This side effect doesn’t usually require medical attention, but you should consult a doctor if your burps are severe, persistent, or interfere with your daily activities.

In rare cases, tirzepatide can trigger serious health problems such as pancreatitis, kidney injury, and gallbladder disease. You should also seek medical help if your burps are accompanied by other concerning symptoms, such as:

• Severe abdominal pain or bloating
• Blood in stools or vomit
• Severe, persistent vomiting
• Persistent diarrhoea accompanied by severe cramping
• Dehydration

Is Mounjaro the Only Weight Loss Treatment to Cause Sulphur Burps?

Mounjaro is not the only weight loss treatment to cause sulphur burps. Tirzepatide is a dual agonist that mimics the effects of two digestive hormones called GIP and GLP-1. It has similar effects on digestive function as semaglutide and liraglutide, which are GLP-1 agonists and the active ingredients in Wegovy and Nevolat.

Tirzepatide, semaglutide, and liraglutide have very similar effects on the body and cause many of the same side effects. All three medications slow gastric emptying, which is considered a key contributor to sulphur burps. Fortunately, the side effects of weight loss injections are typically temporary and usually resolve within a few weeks of treatment.

Mounjaro Sulphur Burps FAQs

Choosing the right weight loss injection requires careful consideration, and it’s essential to have all the facts before making a final decision. Side effects are a key consideration for many people investigating weight loss treatments, and you may have further questions about how your body could react to the medication.

Here, we’ll answer some commonly asked questions about Mounjaro’s potential side effects, including the co-occurrence of sulphur burps with other symptoms such as vomiting, diarrhoea, stomach pains, and flatulence.

Do Sulphur Burps Mean Mounjaro is Working?

Sulphur burps on Mounjaro may indicate changes in digestive function, which can be a sign that the medication is working. One effect of Mounjaro is to reduce the rate at which food moves through the stomach. This helps people to feel fuller for longer and reduces appetite and food cravings, which, in turn, promotes weight loss.

Unfortunately, when food sits in the gut for too long, it can start to ferment and contribute to the production of hydrogen sulphide (H2S). H2S has a distinct eggy odour and, when it builds up in the digestive tract, must be released through flatulence or sulphur burps.

Can You Experience Sulphur Burps and Vomiting With Mounjaro?

It is possible to have more than one gastrointestinal side effect on Mounjaro. Vomiting is among the most common symptoms reported by Mounjaro users, and may affect more than 5% of people taking this medication. Therefore, it’s entirely possible to experience both sulphur burps and vomiting during treatment.

However, severe and persistent vomiting combined with other symptoms may indicate a more serious medical condition, such as acute kidney injury or gallbladder disease. If you are concerned about any side effects on Mounjaro, contact a licensed clinician for a thorough health assessment.

Can You Get Mounjaro Sulphur Burps and Diarrhoea Together?

Diarrhoea is another of Mounjaro’s most commonly reported side effects, and some studies have found that up to 17% of users experience this symptom. So if you have sulphur burps, you may also get diarrhoea. Typically, the gastrointestinal side effects of Mounjaro subside as your body becomes accustomed to the medication.

If your symptoms are severe and don’t seem to be getting better, consult a healthcare professional for advice.

Can You Get Stomach Pains and Sulphur Burps on Mounjaro?

Stomach pain and sulphur burps are both frequently reported side effects of Mounjaro, and it’s possible to have both at once. Gastrointestinal symptoms such as these typically get better with time on Mounjaro and are not usually a cause for concern.

However, severe abdominal pain may be a sign of more serious medical problems, like gallbladder disease and pancreatitis. Talk to a doctor if your stomach pain is extreme, doesn’t improve, or radiates from your abdomen to your back.

Do You Get Sulphur Burps and Wind on Mounjaro?

Sulphur burps are caused by the build-up of an eggy-smelling gas called H2S in the gut, which then escapes via the mouth. These gases may also exit the body via the anus; therefore, some people get both sulphur burps and wind on Mounjaro.

Burps and flatulence can be inconvenient to deal with, but they don’t usually require medical attention. However, if your symptoms are severe, persistent, or significantly disrupting your daily activities, please consult a healthcare professional.

Specialist Weight Loss Support from Prescription Doctor

If you’ve struggled to lose weight with a healthy diet and regular exercise, medications such as Mounjaro can be extremely useful. That being said, the decision to embark on a treatment schedule is not something to be taken lightly, as several factors must be considered. These include instructions on how to administer the medication safely, where to inject the dose, and how long potential side effects may last.

Thankfully, you’re not alone when navigating these issues, as Prescription Doctor is here to help. Our bespoke consultation service is designed with you in mind, recommending the most suitable treatment for your circumstances and offering guidance whenever you need it.

We begin with a simple online consultation. Answer a few medical questions, and our experienced clinicians will determine whether your chosen treatment is right for you. Orders approved before 3 pm on a weekday are eligible for next-day delivery, while all items dispatched by our General Pharmaceutical Council-registered pharmacy are sent in plain packaging for complete discretion. It’s that straightforward.

You can also find a library of useful information on our website. In addition to discussing sulphur burps on Mounjaro, we also outline the best time to take the medication, its impact on pregnancy and fertility, and what to do if your weight loss plateaus. We even publish Mounjaro reviews from Prescription Doctor customers and provide guidance on how to switch to the medication from Wegovy.

Take the first steps towards meaningful weight loss today and begin your Mounjaro consultation with Prescription Doctor. 

Authored By

Kate Latham

Medical Content Writer

Kate has been a scientific content writer since 2017. With a BSc in Biology and a background in cancer research, she is adept at identifying the latest findings in medical research and utilising these

Published on: 11/11/2025

Reviewed By

Mohamed Imran Lakhi

MPharm - Lead Pharmacist

Imran Lakhi is the superintendent pharmacist and founder at Prescription Doctor. He has been at the core of our team.

Reviewed on: 11/11/2025