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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Trapped Wind and Mounjaro — What You Need to Know
Trapped wind and bloating are common side effects that some people experience when taking Mounjaro (tirzepatide) for weight management. This happens because Mounjaro slows how quickly food moves through your digestive system, which can lead to gas buildup and discomfort. Understanding why this occurs and knowing practical strategies to manage it can help you stay comfortable whilst on this prescription-only weight loss medication. Most people find these symptoms improve over time as their body adjusts.
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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 Trapped Wind and Bloating
Mounjaro is a dual GIP and GLP-1 receptor agonist that works by slowing gastric emptying—the rate at which food leaves your stomach and enters your small intestine. This delay in digestion can cause food to ferment in your gut, creating excess gas and bloating. Additionally, Mounjaro may alter how your gut bacteria process food, contributing to wind and discomfort. These effects are particularly noticeable in the first few weeks of starting tirzepatide or when your dose increases. The good news is that your digestive system often adapts over 4–8 weeks as your body adjusts to the medication. Trapped wind is listed as a common side effect in clinical trials, affecting up to 1 in 10 people, though severity varies considerably between individuals.
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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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Managing Trapped Wind on Mounjaro — Practical Strategies
Several practical approaches can help reduce trapped wind whilst taking Mounjaro. Eat slowly and chew food thoroughly to ease digestion. Choose smaller, more frequent meals rather than large ones, and avoid foods known to cause gas—such as beans, broccoli, carbonated drinks, and artificial sweeteners. Stay hydrated by drinking plenty of water throughout the day, which supports digestion. Gentle movement like walking after meals can help gas move through your system more easily. Over-the-counter remedies containing simethicone may provide temporary relief. If trapped wind persists beyond 8 weeks or becomes severe, contact your GP or the prescriber who initiated your Mounjaro treatment—they may adjust your dose or suggest additional support.
- 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 trapped wind last on Mounjaro?
Most people experience trapped wind for 2–8 weeks as their body adjusts to tirzepatide. It often improves significantly by weeks 4–6. However, duration varies between individuals. If it persists beyond 8 weeks, contact your GP for personalised advice.
Can I take over-the-counter remedies for Mounjaro bloating?
Yes, simethicone-based remedies (like Infacol or Wind-Eze) may help. Peppermint tea and ginger can also ease digestive discomfort. Always inform your prescriber of any over-the-counter medicines you're taking, as some may interact with Mounjaro.
Should I stop Mounjaro if trapped wind is severe?
Do not stop without guidance from your prescriber. Severe trapped wind is uncommon but should be reported to your GP or the prescriber who initiated your tirzepatide treatment. They can assess your symptoms and adjust your dose if needed.
Does trapped wind mean Mounjaro isn't working?
No. Trapped wind is a side effect related to how Mounjaro slows digestion, not a sign it's ineffective. Clinical trials showed Mounjaro helps with weight management alongside a reduced-calorie diet and increased physical activity—trapped wind doesn't affect its mechanism.
Are there foods I should avoid to reduce wind?
Yes. Reduce high-fibre foods initially (beans, whole grains, cruciferous vegetables), carbonated drinks, sugar alcohols (sorbitol, xylitol), and fatty foods. Gradually reintroduce these as your symptoms improve. Use our GLP-1 weight loss calculator to track your progress alongside dietary adjustments.
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.