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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Mounjaro Burps — UK Guide to This Common Side Effect
Burping and belching are among the most frequently reported side effects when taking Mounjaro (tirzepatide) for weight management in the UK. This happens because Mounjaro slows how quickly food moves through your stomach, allowing gas to build up. While uncomfortable, burping typically decreases over time as your body adjusts to the medication. Understanding this side effect — and knowing how to access Mounjaro affordably in the UK — helps you make informed decisions about whether this prescription injection is right for you.
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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 Does Mounjaro Cause Burping and How to Manage It?
Mounjaro works by slowing gastric emptying, which means food stays in your stomach longer. This delayed movement allows gas to accumulate, leading to increased burping and belching — particularly after meals. This side effect is temporary and usually improves within 4–8 weeks as your body adapts to the medication.
- Burping often peaks in the first few weeks of starting Mounjaro or after a dose titration increase
- Eating smaller, more frequent meals rather than large portions can reduce gas accumulation
- Chewing food thoroughly and eating slowly may help minimise bloating
- Staying hydrated supports digestion, though carbonated drinks may worsen burping
- This side effect is listed as very common — affecting more than 1 in 10 people in clinical trials
If burping persists beyond 8 weeks or significantly affects your quality of life, speak to your GP or prescriber. However, for most people, it becomes much less noticeable as treatment continues.
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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.
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How to Access Mounjaro in the UK — NHS and Private Routes
In the UK, you can access Mounjaro (tirzepatide) through two main routes. NHS access requires a referral to your local specialist tier 3 weight management service — your GP can refer you if you meet NICE eligibility criteria (BMI ≥30, or BMI 27–29.9 with weight-related health conditions). However, NHS waiting lists are lengthy in many regions, sometimes extending several months.
Private access is faster: complete an online consultation with a UK-licensed prescriber, receive a prescription if clinically appropriate, and have Mounjaro dispensed by a GPhC-registered pharmacy. Private Mounjaro costs typically range from £129–£320 per month depending on your dose. Both routes require a prescription and clinical assessment — Mounjaro is never available without one.
- 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 Mounjaro burps last?
Burping typically decreases within 4–8 weeks as your body adjusts to how Mounjaro slows digestion. However, some people experience mild burping throughout treatment. If it persists beyond 8 weeks, discuss it with your prescriber — they may adjust your dose or suggest dietary changes to help.
Is burping a sign Mounjaro isn't working?
No. Burping is a side effect of how Mounjaro slows gastric emptying, not a sign of effectiveness or failure. Weight loss and burping are separate — you can experience burping while losing weight, or vice versa. Most people see the side effect reduce over time while weight loss continues.
How much does Mounjaro cost privately in the UK?
Private Mounjaro costs vary by dose and provider, typically ranging from £129–£320 per month. Starting doses (2.5–5mg) are usually at the lower end, while higher maintenance doses (10–15mg) cost more. This is roughly £1,500–£3,800 annually depending on your prescribed dose.
Can I get Mounjaro on the NHS in the UK?
Yes, through specialist tier 3 weight management services if you meet NICE eligibility criteria. Your GP can refer you, but waiting lists are often long (several months in many regions). Private prescription is faster but requires payment. Both require a clinical assessment confirming you're suitable for treatment.
What other side effects does Mounjaro cause besides burping?
Common side effects include nausea, diarrhoea, constipation, stomach pain, and loss of appetite — particularly in the first few weeks. These typically improve over time. Serious side effects are rare but can include severe stomach pain (possible pancreatitis) or gallbladder problems. Report any concerning symptoms to your prescriber immediately.
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.