The UK's most complete GLP-1 guide
Every Question Answered. Every Side Effect Explained.
- How GLP-1 medications work
- Mounjaro vs Wegovy compared
- Injection instructions
- Side effects & solutions
- What to eat on treatment
- FAQs answered
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How To Get Rid Of Sulphur Burps On Mounjaro
Sulphur burps (also called rotten egg burps) are a reported side effect experienced by some people taking Mounjaro, the once-weekly tirzepatide injection used for weight management in the UK. These unpleasant burps usually happen because Mounjaro slows how quickly food moves through your stomach, which can cause fermentation and gas. The good news is that this side effect is typically temporary and manageable with practical strategies. Understanding what causes them and comparing how different GLP-1 medications affect this symptom can help you find relief.
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What Is BMI and Why Does It Matter?
Body Mass Index (BMI) is the most widely used screening tool for assessing whether your weight falls within a healthy range. Used by the NHS, GPs, and weight management services across the UK, BMI provides a quick snapshot of your weight relative to your height. The formula is simple: your weight in kilograms divided by your height in metres squared (kg/m²).
While BMI isn't a perfect measure — it doesn't account for muscle mass, bone density, or fat distribution — it remains the standard first step in identifying potential weight-related health risks including type 2 diabetes, cardiovascular disease, high blood pressure, and certain cancers.
The NHS also recommends adjusted thresholds for people of South Asian, Chinese, or Black African heritage — a BMI of 23 or above is classified as overweight, and 27.5 as obese. Our calculator includes this adjustment as a one-click toggle.
What Causes Sulphur Burps On Mounjaro And How They Compare To Wegovy
Mounjaro (tirzepatide) works as a dual GIP and GLP-1 receptor agonist, meaning it activates two natural hormone pathways to reduce appetite and support weight management. One key effect is that it slows gastric emptying—how quickly food leaves the stomach. This delayed digestion can cause food to ferment in your stomach, producing hydrogen sulphide gas, which creates the distinctive rotten egg smell in burps.
Wegovy (semaglutide), by contrast, is a GLP-1-only medication. Clinical trial data shows both medications slow gastric emptying, but the mechanism differs slightly. Some people report fewer sulphur burps on Wegovy, though individual experiences vary widely. The SURMOUNT trials for Mounjaro and STEP trials for Wegovy both documented gastrointestinal side effects, but sulphur burps specifically are more commonly reported anecdotally with Mounjaro, possibly because of its dual mechanism. However, this is not assured—many people on Mounjaro experience no sulphur burps at all.
- Mounjaro: dual GIP+GLP-1 mechanism, may increase gastric fermentation
- Wegovy: GLP-1 only, some users report fewer burps, but not universal
- Both slow gastric emptying and can cause GI side effects
- Individual response varies significantly
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If your BMI suggests you're overweight or obese, explore our GLP-1 calculators to project potential weight loss on Mounjaro or Wegovy.
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Practical Relief Strategies And When To Seek Prescriber Advice
If you're experiencing sulphur burps on your Mounjaro dose, try eating smaller, more frequent meals rather than large portions—this reduces the amount of food in your stomach at once, decreasing fermentation. Avoid foods known to worsen gas: cruciferous vegetables (broccoli, cabbage), beans, and high-fat foods. Stay hydrated with water and ginger tea, which can support digestion. Gentle movement or a short walk after eating may help food move through your stomach more efficiently.
Most importantly, inform your prescriber if sulphur burps are severe or affecting your quality of life. They may suggest dose timing adjustments, dietary changes, or in some cases, a dose reduction or medication review. Some people find the symptom improves after a few weeks as their body adjusts to Mounjaro. Your prescriber can assess whether Mounjaro is still the right choice or whether switching to an alternative such as Wegovy through a UK-licensed prescriber might be more suitable for you. Use our free GLP-1 weight loss calculator to understand how different medications and doses may affect your projected weight loss goals.
- Dual GIP/GLP-1 receptor agonist
- Up to 22.5% body weight loss (SURMOUNT-1)
- Weekly injection, dose escalation over 20+ weeks
- Available via private prescription in the UK
- Doses: 2.5mg → 5mg → 7.5mg → 10mg → 12.5mg → 15mg
- GLP-1 receptor agonist
- Up to 15–17% body weight loss (STEP trials)
- Weekly injection, 5-step dose escalation
- NHS & private prescription available
- Doses: 0.25mg → 0.5mg → 1mg → 1.7mg → 2.4mg
Mounjaro vs Wegovy: Head-to-Head
A side-by-side comparison of the two most popular GLP-1 weight loss medications available in the UK.
| Feature | Mounjaro | Wegovy |
|---|---|---|
| Drug class | Dual GIP/GLP-1 agonist | GLP-1 agonist |
| Active ingredient | Tirzepatide | Semaglutide |
| Avg. weight loss | 15–22.5% | 12–17% |
| Key trial | SURMOUNT-1 (2022) | STEP 1 (2021) |
| Max dose | 15 mg weekly | 2.4 mg weekly |
| Escalation period | 20–32 weeks | 16–20 weeks |
| Administration | Weekly injection (pen) | Weekly injection (pen) |
| NHS availability | Private prescription only | NHS & private |
| Approx. private cost | £150–£250/month | £150–£300/month |
| Common side effects | Nausea, diarrhoea, constipation | Nausea, vomiting, diarrhoea |
Data sourced from SURMOUNT-1 and STEP 1 clinical trials. Costs are approximate and vary by provider. Always consult a prescriber.
Am I Eligible for Weight Loss Medication?
In the UK, eligibility for GLP-1 weight loss medications like Mounjaro and Wegovy is based on your BMI and overall health profile.
- BMI of 30 or above (obese)
- Age 18 or over
- No contraindicated conditions
- Committed to lifestyle changes
- BMI of 27 or above
- Plus type 2 diabetes
- Or high blood pressure
- Or obstructive sleep apnoea
Use our BMI calculator to check whether your BMI falls within the eligible range.
How We Built These Tools
Every calculator and guide on myweightcheck is built with accuracy and transparency in mind. Our BMI calculator uses the standard WHO formula with NHS-aligned category thresholds. Our GLP-1 projections are modelled on published clinical trial data from SURMOUNT and STEP studies.
All data stays on your device. We don't require sign-ups, and we don't store your health information on any server. Your progress tracker saves data locally in your browser using localStorage, so only you can see it.
We're based in the UK and our tools are designed specifically for UK users — supporting stone & lbs by default, referencing NHS guidelines, using NICE-approved medication data, and linking to GPhC-registered pharmacies.
Frequently Asked Questions
Common questions about BMI, weight loss medications, and our free UK tools.
How long do sulphur burps on Mounjaro typically last?
For most people, sulphur burps are temporary and often improve within the first 2–4 weeks as the body adjusts to Mounjaro. However, some people experience them intermittently throughout treatment. If they persist beyond a few weeks, speak with your prescriber about potential dietary adjustments or dose modifications.
Are sulphur burps more common on Mounjaro than Wegovy?
Anecdotal reports suggest sulphur burps may be more frequently reported with Mounjaro due to its dual GIP+GLP-1 mechanism, but clinical trial data does not show a significant difference in frequency between the two medications. Individual experiences vary greatly—many people on Mounjaro have no sulphur burps at all.
Can I prevent sulphur burps on Mounjaro?
Yes, prevention strategies include eating smaller meals more frequently, avoiding gas-producing foods (beans, cruciferous vegetables, high-fat foods), staying hydrated, and taking a gentle walk after eating. These dietary and lifestyle adjustments help reduce stomach fermentation and often reduce burp frequency significantly.
Should I stop taking Mounjaro if I get sulphur burps?
No—sulphur burps are a temporary side effect, not a sign that Mounjaro is unsafe. Always speak with your prescriber before stopping any medication. They may suggest dietary changes, dose adjustments, or a temporary dose reduction. Only your prescriber can decide whether to continue or switch your medication.
Is there a medication I can take to stop sulphur burps on Mounjaro?
There is no specific medication to stop burps caused by Mounjaro's effect on digestion. However, your prescriber may recommend over-the-counter remedies such as peppermint oil or simethicone (Gas-X), which can help some people. Ginger tea and probiotics are also commonly tried, though evidence is limited. Your GP or prescriber can advise on safe options alongside your Mounjaro treatment.
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