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 Stop Eggy Burps On Mounjaro
Eggy burps (sulphur burps) are a known side effect affecting some people using Mounjaro (tirzepatide), particularly during the first few weeks or after dose increases. These unpleasant burps occur because Mounjaro slows how quickly food moves through your stomach, allowing bacteria to ferment food longer. The good news: they typically reduce as your body adjusts. We'll explain what causes them, practical ways to manage them, and how this side effect compares between Mounjaro and Wegovy (semaglutide).
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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.
Why Mounjaro Causes Eggy Burps — And How Wegovy Compares
Mounjaro works as a dual GIP and GLP-1 receptor agonist. This dual mechanism is more potent than GLP-1 alone, which is why some people experience more pronounced digestive side effects initially. The medication slows gastric emptying — meaning food stays in your stomach longer — which can cause fermentation and sulphur-smelling burps.
Wegovy (semaglutide), by contrast, is a GLP-1 agonist only. Because it uses a single mechanism rather than dual action, some people report fewer or milder GI side effects overall, though individual experiences vary widely. Clinical trial data from SURMOUNT (Mounjaro) and STEP (Wegovy) show both medications cause nausea and digestive changes, but the timing and intensity differ between individuals.
The key difference: Mounjaro's stronger effect on appetite and satiety can intensify early GI symptoms, including eggy burps, though these typically improve within 2–4 weeks as your body adapts.
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Enter your height and weight in our free calculator. Get your BMI, NHS category, healthy weight range, and ethnicity-adjusted thresholds instantly.
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 Ways To Stop Or Reduce Eggy Burps On Mounjaro
Eat slowly and chew thoroughly. Smaller, slower meals reduce fermentation and improve digestion. Avoid rushing meals or eating large portions.
Stay hydrated. Drinking water throughout the day supports digestive function and can reduce the severity of burps.
Avoid trigger foods: Eggs, cruciferous vegetables (broccoli, cabbage, Brussels sprouts), beans, and high-fat foods ferment more easily. Keep a food diary to identify your personal triggers.
Ginger tea or peppermint may help. These have traditional digestive support properties, though evidence is modest. Speak to your GP before adding supplements.
Time your injections. Some people report fewer burps if they inject on a day when they can eat smaller, lighter meals for the first 24 hours. Your prescriber can advise on timing.
If burps persist beyond 4 weeks or significantly affect your quality of life, discuss with your prescriber — dose adjustments or alternative medications like Wegovy may be considered.
- 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.
Are eggy burps a sign that Mounjaro isn't working?
No. Eggy burps are a side effect of how Mounjaro slows digestion, not a sign of effectiveness. Many people who experience this side effect still lose weight successfully. Burps typically reduce as your body adjusts — usually within 2–4 weeks.
Do eggy burps happen with Wegovy as well?
Eggy burps can occur with Wegovy, but they're generally reported less frequently because Wegovy is a single GLP-1 agonist rather than dual action. However, both medications slow gastric emptying, so individual experiences vary. Your prescriber can help you choose based on your tolerability.
Should I stop taking Mounjaro if I get eggy burps?
No — you should speak to your GP or prescriber first. Burps usually improve within a few weeks. Stopping suddenly is not advised. Your prescriber may suggest dietary changes, dose timing adjustments, or in some cases, a switch to an alternative like Wegovy.
How long do eggy burps last on Mounjaro?
For most people, eggy burps are worst in the first 1–2 weeks after starting or after a dose increase. They typically improve significantly by week 3–4 as your body adapts to the medication. If they persist beyond 4 weeks, contact your prescriber.
Can I use antacids or digestive aids to help with eggy burps?
Over-the-counter antacids may provide temporary relief, but they won't address the root cause. Ginger, peppermint tea, and slow eating are gentler options. Always check with your GP before adding any new supplements or medications, as some may interact with Mounjaro.
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