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 Do You Get Burps On Mounjaro?
Burping and excessive gas are common side effects reported by people taking Mounjaro (tirzepatide), a prescription-only GLP-1 and GIP receptor agonist used for weight management in UK adults. This happens because Mounjaro slows how quickly food moves through your stomach and digestive system, which can lead to gas buildup. The good news is that this side effect typically improves over time as your body adjusts to the medication. Understanding why it happens and how to manage it can help you feel more confident during your Mounjaro journey.
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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.
How Mounjaro Causes Burping and Gas
Mounjaro works by activating GIP and GLP-1 receptors, which signals to your body that you are full and reduces appetite. One effect of this mechanism is delayed gastric emptying — food moves more slowly from your stomach into your small intestine. This slower movement of food and digestive juices creates gas and air in your stomach, which your body releases as burps.
Additionally, eating smaller portions (because you feel fuller faster on Mounjaro) and changes to what you eat can affect digestion. Some foods — particularly those high in fibre or fat — are harder to digest and may increase gas production. Swallowing air while eating more slowly, or from carbonated drinks, can also contribute to burping.
- Gas buildup is a natural consequence of slower digestion
- More common in the first 4–8 weeks as your body adapts
- Usually improves as your digestive system adjusts to the medication
- Not dangerous — just uncomfortable
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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 Burps and Gas While on Mounjaro
Most people find that burping becomes less bothersome after a few weeks on Mounjaro, especially once they reach a stable dose. In the meantime, several practical strategies can help.
- Eat slowly and chew food thoroughly — this reduces swallowed air and aids digestion
- Avoid carbonated drinks — fizzy beverages add extra gas to your stomach
- Stay hydrated with still water — aim for 6–8 glasses daily to support digestion
- Avoid foods that cause bloating — beans, lentils, cruciferous vegetables (broccoli, cabbage) and high-fat foods can increase gas
- Take a short walk after eating — gentle movement helps food move through your digestive system
- Space out meals — eating smaller, more frequent meals may be easier to digest than larger ones
If burping persists beyond 8 weeks or becomes severe, speak to your GP or the prescriber managing your Mounjaro treatment.
- 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 burping on Mounjaro dangerous?
No. Burping and gas are uncomfortable but not dangerous side effects of Mounjaro. They occur because the medication slows digestion. If you experience severe abdominal pain alongside burping, contact your GP immediately, as this could indicate a different issue like pancreatitis (though this is rare).
How long does burping last on Mounjaro?
Burping is most common in the first 4–8 weeks while your digestive system adapts to the medication. Most people find it improves significantly after this period. If it persists beyond 12 weeks, discuss this with your prescriber — they may adjust your dose or suggest additional strategies.
Can I take something to stop burping on Mounjaro?
Over-the-counter remedies like antacids or simeticone (Windstone, Infacol) may help manage gas and bloating. However, Mounjaro may affect how your body absorbs oral medications, so check with your GP or pharmacist before taking anything new. Peppermint tea and ginger can also support digestion naturally.
Does burping mean Mounjaro isn't working?
No. Burping is a side effect unrelated to how well Mounjaro is working for weight management. Many people experience burping while still losing weight effectively. Track your progress using our free GLP-1 weight loss calculator to monitor your results independently of side effects.
Should I stop taking Mounjaro if I have severe burping?
Do not stop taking Mounjaro without speaking to your prescriber first. If burping is severe or affecting your quality of life, contact your GP or the service managing your prescription. They can discuss dose adjustments, timing strategies, or other options. Never stop a prescription medication without professional guidance.
Ready to take control of your weight loss journey?
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