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
Free tracker included with every download this week
How to Stop Eggy Burps When Taking Mounjaro
Eggy or sulphur-smelling burps are a reported side effect that some people experience when taking Mounjaro (tirzepatide). This uncomfortable symptom typically occurs in the first few weeks of treatment or after dose increases, as your digestive system adjusts to the medication. The good news is that for most people, eggy burps are temporary and manageable with practical strategies. This guide explains why this happens and how to reduce or eliminate this side effect while taking Mounjaro via your KwikPen injector.
10,000+ calculations today · NHS-aligned thresholds · 100% free
Calculate Your BMI Instantly
Enter your height and weight below. Supports both imperial (stone & lbs) and metric (kg). Results include NHS category, healthy weight range, and ethnicity adjustments.
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 Eggy Burps Happen on Mounjaro and Comparing Wegovy
Eggy burps occur because Mounjaro slows gastric emptying — the rate at which food moves from your stomach to your small intestine. When food stays in the stomach longer, bacteria in your gut ferment it, producing hydrogen sulphide gas, which smells like eggs or rotten vegetables. This is a natural side effect of how the tirzepatide dual GIP/GLP-1 mechanism works.
Comparing Mounjaro with Wegovy (semaglutide): Wegovy uses a single GLP-1 agonist mechanism, which also slows gastric emptying but typically produces fewer reports of eggy burps in clinical trials. However, both medications slow digestion as part of their action — the difference is in degree and individual response. Whether you're on Mounjaro or considering Wegovy, gastric side effects like nausea, bloating, and eggy burps are possible but usually temporary.
- Mounjaro: Dual GIP+GLP-1 agonist — stronger gastric emptying effect
- Wegovy: GLP-1 agonist only — generally milder gastric effects reported
- Both: Effects typically reduce after 4–8 weeks as your body adapts
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
How It Works
Three simple steps to understand your weight and take action.
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.
Use our progress tracker to log your weight weekly, visualise your journey with charts, and stay motivated — all stored privately in your browser.
Free Weight Loss Tools & Guides
Everything you need to understand your weight, explore medication options, and track your progress — completely free.
Practical Strategies to Manage and Stop Eggy Burps
Dietary changes work fastest: Eat smaller, more frequent meals rather than large portions. Choose bland, easily digestible foods like plain chicken, rice, toast, and steamed vegetables. Avoid foods known to cause gas — cruciferous vegetables (broccoli, cabbage), beans, high-fat foods, and carbonated drinks. Stay hydrated with water and herbal teas.
Medication and timing tips: Take your weekly Mounjaro injection at a consistent time and eat a light meal 1–2 hours after. Ginger supplements or ginger tea may help digestion. If eggy burps persist beyond 8 weeks or become severe, contact your prescriber — they may adjust your dose titration schedule or recommend temporary dietary modifications. Most people find symptoms resolve completely as their body adjusts to the medication.
- 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 eggy burps last on Mounjaro?
For most people, eggy burps are temporary and typically improve within 4–8 weeks as your digestive system adapts to the medication. Some experience relief within 1–2 weeks with dietary changes. If symptoms persist beyond 8 weeks, contact your prescriber.
Are eggy burps more common on Mounjaro than Wegovy?
Clinical data suggests Mounjaro users report eggy burps more frequently than Wegovy users, likely due to the dual GIP+GLP-1 mechanism creating a stronger gastric emptying effect. However, individual responses vary considerably — some Wegovy users experience them too.
What foods should I avoid to prevent eggy burps?
Avoid cruciferous vegetables (broccoli, cabbage, cauliflower), beans, lentils, high-fat foods, carbonated drinks, and artificial sweeteners. Eat smaller, frequent meals of bland foods like chicken, rice, toast, and steamed vegetables. Ginger and peppermint tea may help.
Should I stop taking Mounjaro if I get eggy burps?
No. Eggy burps are a temporary side effect and usually resolve within weeks. Always speak to your prescriber before stopping any medication. They can help manage symptoms through dietary adjustments or dose titration changes without stopping treatment.
Does the dose of Mounjaro affect eggy burps?
Yes, eggy burps are more likely after starting or increasing your Mounjaro dose. This is why dose titration — starting at 2.5 mg and increasing gradually every 4 weeks — helps your body adapt. Taking time between dose increases reduces digestive side effects.
Ready to take control of your weight loss journey?
Start with a free BMI check, explore your GLP-1 options, or begin tracking your progress today. No sign-up. No cost. Just results.