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 Burping — Why It Happens and How to Manage It
Burping and excessive gas are common side effects reported by people taking Mounjaro (tirzepatide) for weight management in the UK. This happens because Mounjaro slows how quickly food moves through your stomach, which can cause gas buildup and digestive discomfort. Understanding why this occurs and how to manage it can help you decide whether Mounjaro is right for you. This guide explains the cause, what to expect, and how to access Mounjaro through the NHS or private prescription in the UK.
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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 Mounjaro Causes Burping and Digestive Gas
Burping and gas are common gastrointestinal side effects of Mounjaro because the medication works by slowing gastric emptying — the rate at which food leaves your stomach. When food moves through your digestive system more slowly, gases accumulate, leading to belching, bloating, and flatulence. This is a known effect of GLP-1 and GIP/GLP-1 receptor agonists like Mounjaro and is listed in the medicine information.
These symptoms typically appear early in treatment, often within the first few weeks, and often improve over time as your body adjusts to the medication. The burping and gas may be more noticeable after eating larger meals or foods that are harder to digest.
- Burping usually lessens as your body adapts (often within 4–8 weeks)
- Gas buildup is directly linked to slowed stomach emptying
- Symptoms may worsen temporarily when increasing your Mounjaro dose
- Individual experiences vary significantly
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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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UK Access, Cost, and NHS Eligibility for Mounjaro
In the UK, Mounjaro is available through two routes: NHS specialist weight management services or private online prescription. NHS access requires referral to a tier 3 weight management service and eligibility assessment, though waiting lists can be lengthy in many areas. Private prescriptions through GPhC-registered pharmacies following an online consultation typically cost between £150–£280 per month depending on your dose level. Before starting Mounjaro, a licensed prescriber will assess whether the medication is suitable based on your BMI, health conditions, and medical history. Use our free GLP-1 weight loss calculator to explore potential outcomes with tirzepatide at different doses.
- 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.
Does burping from Mounjaro mean I should stop taking it?
Not necessarily. Burping and gas are very common side effects that usually improve within 4–8 weeks as your body adjusts. Talk to your prescriber if symptoms are severe or persistent. They can advise whether to continue, adjust your dose, or try dietary changes to manage the discomfort.
Can I do anything to reduce burping while taking Mounjaro?
Yes. Eat smaller, more frequent meals rather than large portions. Avoid carbonated drinks, chew food thoroughly, eat slowly, and limit foods that cause gas (beans, cruciferous vegetables, high-fat foods). These dietary adjustments often reduce symptoms significantly without stopping the medication.
How much does Mounjaro cost privately in the UK?
Private Mounjaro typically costs £150–£280 per month depending on your dose (starting at 2.5 mg up to 15 mg maximum). Prices vary between pharmacies. Some providers offer subscription discounts. Always check the specific cost with your chosen pharmacy before starting treatment.
Can I get Mounjaro on the NHS in the UK?
Yes, NICE has approved tirzepatide for NHS use through specialist tier 3 weight management services. Eligibility requires a BMI of 30 or above (or 27+ with weight-related health conditions). Access is via GP referral, though waiting lists vary significantly by region and ICB availability.
What's the difference between Mounjaro and Wegovy for burping?
Both Mounjaro (tirzepatide) and Wegovy (semaglutide) cause similar gastrointestinal side effects including burping because both slow gastric emptying. Mounjaro uses a dual GIP/GLP-1 mechanism while Wegovy uses GLP-1 only, but both produce comparable digestive symptoms that typically improve over time with continued use.
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.