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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Why Does Mounjaro Make You Burp? Cost & Access in the UK
Mounjaro (tirzepatide) commonly causes burping, bloating, and gas — particularly when first starting or after dose increases. This happens because the medication slows how food moves through your stomach and can trap air in your digestive system. While uncomfortable, these side effects often improve over time as your body adjusts. If you're considering Mounjaro and want to know costs and how to access it in the UK — whether through private prescription or NHS referral — this guide covers everything you need to know about accessing this weight management injection and managing its effects.
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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.
Understanding Burping and Gas on Mounjaro — And UK Access Costs
Burping, belching, and intestinal gas are among the most frequently reported side effects of Mounjaro in clinical trials and real-world use. These happen because tirzepatide slows gastric emptying — the rate at which food leaves your stomach — which can cause air to become trapped in your digestive system. This mechanism is actually how Mounjaro helps you feel fuller for longer, but it comes with this uncomfortable trade-off.
Why does this happen specifically? Mounjaro activates both GIP and GLP-1 receptors, which slow stomach contractions. Food moves more slowly, gas accumulates, and you experience burping and bloating — especially in the first 4–8 weeks.
Managing burping on Mounjaro:
- Eat smaller, more frequent meals rather than large portions
- Avoid carbonated drinks and fizzy beverages
- Chew food slowly and thoroughly — don't rush meals
- Reduce high-fat and high-fibre foods temporarily if they worsen symptoms
- Stay hydrated with still water rather than sparkling water
- Light walking after meals may help ease gas
Most users find burping improves significantly after 8–12 weeks as the body adapts to the medication. If severe or persistent, speak to your prescriber about dose adjustments.
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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.
Mounjaro Cost and Access in the UK — NHS Versus Private Routes
NHS access: Mounjaro is available through NHS specialist weight management services (tier 3), but access varies significantly by region and availability is limited. You'll need a referral from your GP to a specialist tier 3 service in your local integrated care board (ICB). Waiting lists can be months to years in many areas. If approved, the NHS covers all costs.
Private access: Mounjaro is available through UK-licensed private prescribers via online consultation. You'll typically need a BMI of 30 or above, or 27–29.9 with weight-related health conditions. Private costs range from approximately £160–£300 per month depending on your dose — a KwikPen containing 4 weeks of doses is dispensed by a GPhC-registered pharmacy. Try our GLP-1 weight loss calculator above to estimate potential costs and outcomes at different Mounjaro 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.
Is Mounjaro available on the NHS in the UK?
Yes, but only through specialist tier 3 weight management services following a GP referral. NICE has approved tirzepatide for NHS use, but availability is limited and varies by region. Many areas have long waiting lists. Private prescription is faster — typically available within days following an online assessment with a UK-licensed prescriber.
How much does Mounjaro cost privately in the UK?
Private Mounjaro costs approximately £160–£300 per month depending on your dose. Starting doses (2.5 mg) cost less; maximum doses (15 mg) cost more. Each KwikPen contains 4 weeks of injections. Prices vary between private providers, so it's worth comparing before committing.
Does burping on Mounjaro ever go away?
Yes — most users find burping and gas improve significantly after 8–12 weeks as the body adjusts. Eating smaller meals, avoiding carbonated drinks, and chewing slowly can help in the meantime. If burping persists severely, your prescriber may adjust your dose or timing of medication.
What's the difference between Mounjaro and Wegovy for burping?
Both can cause burping and gas because both slow gastric emptying. Mounjaro (tirzepatide) uses a dual GIP+GLP-1 mechanism; Wegovy (semaglutide) uses GLP-1 only. Some users report slightly more digestive symptoms with Mounjaro initially, though experiences vary widely. Compare both with our GLP-1 weight loss calculator.
Can I get Mounjaro prescribed privately without NHS referral?
Yes. You can access Mounjaro through private online consultations with a UK-licensed prescriber without NHS involvement. You'll need a clinical assessment to confirm eligibility (BMI 30 or above, or 27–29.9 with weight-related health conditions). Prescriptions are dispensed by GPhC-registered pharmacies.
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.