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 Get Rid of Sulphur Burps on Mounjaro
Sulphur burps (rotten egg-smelling belching) are a well-documented side effect of Mounjaro (tirzepatide) during the early weeks of treatment. This occurs because Mounjaro slows how quickly food moves through your stomach, allowing bacterial fermentation to increase gas production. The good news is that sulphur burps typically improve significantly after 4–8 weeks as your digestive system adjusts to the medication. Understanding the causes and practical management strategies can help you stay comfortable whilst your body adapts.
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.
Sulphur Burps vs Wegovy: Mechanism and Frequency Differences
Both Mounjaro (tirzepatide) and Wegovy (semaglutide) slow gastric emptying, but their mechanisms differ slightly. Mounjaro is a dual GIP and GLP-1 receptor agonist, while Wegovy is a GLP-1 agonist only. This dual action in Mounjaro may explain why sulphur burps occur more frequently and intensely in some users compared to Wegovy.
Clinical trial data (SURMOUNT and STEP trials) shows gastrointestinal side effects are common with both medications during dose escalation, but sulphur burps are reported more often with tirzepatide. However, individual experiences vary considerably — some patients on Wegovy experience sulphur burps, whilst some on Mounjaro experience none. Your prescriber can discuss which medication might suit your digestive profile, and our GLP-1 weight loss calculator can help you understand projected outcomes with either option.
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 Reduce Sulphur Burps
Dietary adjustments: Eat smaller, more frequent meals rather than large meals. Avoid high-fat foods, carbonated beverages, and cruciferous vegetables (broccoli, cabbage) which increase gas production. Sip water slowly rather than drinking large amounts at once.
Timing and lifestyle: Eat slowly and chew thoroughly — this reduces fermentation in the stomach. Stay upright for at least 30 minutes after eating. Light walking after meals can aid digestion. If sulphur burps persist beyond week 8, contact your prescriber — they may adjust your dose timing or suggest medication to support digestion.
- 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 last on Mounjaro?
Most patients experience a significant reduction after 4–8 weeks as the body adapts to the medication. However, some people report occasional sulphur burps continuing longer. If they persist beyond 12 weeks, your GP or prescriber should review your treatment and may suggest dose adjustments or additional support.
Are sulphur burps worse on Mounjaro than Wegovy?
Clinical data suggests sulphur burps are reported more frequently with tirzepatide (Mounjaro) than semaglutide (Wegovy), likely due to the dual GIP and GLP-1 mechanism. However, individual responses vary — some people experience them on Wegovy and others don't on Mounjaro. Your prescriber can help determine which medication suits you best.
Does increasing my Mounjaro dose make sulphur burps worse?
Yes, sulphur burps often intensify during dose escalation weeks. They typically improve once you've been stable at a new dose for 2–4 weeks. This is one reason the standard dose escalation protocol (minimum 4 weeks per dose) is recommended — it gives your stomach time to adjust.
What foods should I avoid to prevent sulphur burps?
Reduce fatty foods, carbonated drinks, cruciferous vegetables, and foods high in sulphur (eggs, garlic, onions). Focus on lean proteins, white rice, toast, and plain vegetables. Keep a food diary to identify your personal triggers, as responses vary between individuals.
Should I stop taking Mounjaro if sulphur burps are severe?
No — do not stop without medical guidance. Instead, contact your GP or prescriber immediately. They may recommend digestive support, dose adjustments, or meal timing changes. Sulphur burps are a known, usually temporary side effect. Your prescriber can help you manage them safely.
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.