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
Does Mounjaro Cause Burping and Gas?
Yes, burping and excessive gas are recognised side effects of Mounjaro (tirzepatide), though they're less commonly reported than nausea or constipation. These digestive symptoms typically occur early in treatment as your body adjusts to how the medication affects your stomach and digestive tract. Most people find these symptoms improve or resolve within a few weeks. If burping persists or becomes distressing, your GP or prescriber can offer practical strategies to manage it alongside your Mounjaro treatment.
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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.
How Mounjaro Causes Burping and Gas
Mounjaro is a dual GIP and GLP-1 receptor agonist — meaning it activates two natural hormone pathways that regulate appetite and digestion. One key way it works is by slowing gastric emptying: food moves more slowly from your stomach into your small intestine. This slower movement can trap gas in your stomach, leading to burping and bloating.
Additionally, Mounjaro may alter how your gut processes food and affects the balance of bacteria in your digestive system. The medication also reduces appetite and may cause you to eat differently — smaller portions, different food types, or eating patterns your gut isn't used to — which can create temporary gas and bloating.
The good news: gastric emptying typically normalises over time as your body adjusts. Most people find burping and gas ease significantly after 2–4 weeks on a stable dose, though individual timelines vary.
Clinically BackedWeight Loss
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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.
Managing Mounjaro Burping and When to Seek Advice
Practical steps to reduce burping and gas while taking Mounjaro:
- Eat slowly and chew thoroughly — this reduces the amount of air you swallow
- Avoid fizzy drinks and carbonated beverages — these add gas to your stomach
- Limit foods known to cause gas (beans, cruciferous vegetables, high-fat foods) temporarily
- Stay hydrated with still water rather than sparkling water
- Take short walks after meals to aid digestion
- Eat smaller, more frequent meals rather than large ones
- Ginger tea or peppermint tea may help settle your stomach
If burping and gas are severe, persistent beyond 4 weeks, or accompanied by severe stomach pain, contact your GP or prescriber. You can also track your symptoms using our free progress tracker to identify patterns and discuss them with your healthcare provider.
- 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 does burping last when taking Mounjaro?
Burping and gas typically improve within 2–4 weeks as your body adjusts to how Mounjaro affects your digestion. However, individual timelines vary — some people notice improvement sooner, while others may take longer. If symptoms persist beyond 4 weeks, discuss this with your prescriber.
Is burping a sign that Mounjaro isn't working?
No. Burping is a common side effect related to how Mounjaro slows stomach emptying, not a sign of ineffectiveness. Medication efficacy is measured by appetite reduction and weight loss over weeks and months, not by individual side effects.
Can I take anything to stop burping on Mounjaro?
Over-the-counter remedies like simethicone (WindSetlers) or peppermint oil capsules may help some people. However, always check with your GP or pharmacist before taking new supplements, as Mounjaro may affect how medications are absorbed. Dietary changes (avoiding fizzy drinks, eating slowly) are often most helpful.
Is burping dangerous or a sign of a serious problem?
Burping alone is not dangerous. However, if you experience severe stomach pain alongside burping, seek urgent medical advice — this could indicate pancreatitis. Mild to moderate burping and bloating are expected side effects that typically resolve as your body adjusts.
Should I stop Mounjaro if I have burping and gas?
Not necessarily. Speak to your prescriber before stopping. Most burping improves within weeks without stopping treatment. Your prescriber may suggest dose adjustments, dietary changes, or other strategies. Our GLP-1 weight loss calculator can help you understand what results are realistic at different doses.
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.