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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How To Stop Bloating On Mounjaro
Bloating and digestive discomfort are common side effects when starting Mounjaro (tirzepatide), especially during the dose titration phase. The good news is that these symptoms often settle within a few weeks, and there are practical strategies you can use to minimise bloating and improve your comfort. This guide covers evidence-based approaches to managing bloating, alongside information about accessing Mounjaro in the UK and what it costs.
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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.
Managing Bloating: Practical Strategies And Dos
Bloating typically occurs because Mounjaro slows how quickly food leaves your stomach (gastric emptying), which can cause gas accumulation and a heavy feeling. Most people find this effect reduces significantly after 4–8 weeks as the body adjusts. In the meantime, these strategies can help:
- Eat smaller, more frequent meals — instead of three large meals, try five or six smaller portions throughout the day
- Avoid high-fat and high-fibre foods temporarily — fat and fibre slow digestion further; gradually reintroduce them as bloating improves
- Eat slowly and chew thoroughly — this aids digestion and reduces gas formation
- Stay hydrated — drink water throughout the day, but avoid large amounts with meals
- Gentle movement after eating — a 10-minute walk can help ease bloating and improve gastric function
- Try ginger or peppermint tea — both have anti-inflammatory properties and may ease digestive discomfort
- Avoid carbonated drinks and artificial sweeteners — these increase gas and bloating
If bloating is severe or does not improve after 8 weeks, contact your prescriber — they may adjust your dose or suggest medication to support digestion.
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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.
Accessing Mounjaro In The UK: NHS Vs Private Routes
Mounjaro is prescription-only in the UK and available through two routes:
- NHS access: via specialist tier 3 weight management services following GP referral. Availability varies significantly by region and ICB (Integrated Care Board). Many areas have substantial waiting lists. Your GP can refer you if you meet NHS eligibility criteria (BMI ≥30, or ≥27.5 with weight-related health conditions).
- Private access: through online consultations with UK-licensed prescribers, typically costing £129–£250 per month depending on dose. A clinical assessment is required before prescription. No NHS referral needed, and treatment can begin much faster than NHS routes.
Both routes require a valid prescription from a licensed healthcare professional. Your prescriber will assess your individual suitability before issuing a prescription.
If choosing private prescription: You'll complete an online health questionnaire and have a consultation (video or telephone) with a UK-licensed prescriber. They'll assess your medical history, current medications, and weight loss goals. If approved, a prescription is sent to a GPhC-registered pharmacy. Costs cover the consultation and prescription itself — delivery times vary but typically arrive within 2–5 working days. Always verify that any provider uses GPhC-registered pharmacies and UK-qualified prescribers before committing. Use our GLP-1 weight loss calculator to explore potential outcomes at different Mounjaro doses, and our free BMI calculator to check your current BMI and eligibility baseline.
- 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 bloating last on Mounjaro?
Bloating typically improves significantly within 4–8 weeks as your body adjusts to how Mounjaro slows gastric emptying. Most people experience a noticeable reduction in discomfort by week 8. If bloating persists beyond 8 weeks or worsens, contact your prescriber — dose adjustment or additional support may help.
Will bloating go away completely?
For most people, yes. As your body adapts and you adjust to smaller portions, bloating usually resolves entirely. Some people experience mild bloating intermittently if they eat too much too quickly, but the severe bloating of the early weeks typically disappears within 2–3 months.
How much does private Mounjaro cost in the UK?
Private Mounjaro (tirzepatide) typically costs £129–£250 per month depending on your dose and provider. A 2.5 mg starter dose may cost less than a 15 mg maintenance dose. Costs include the online consultation, prescription, and medication. Always confirm exact pricing with your chosen provider before starting.
Can I get Mounjaro on the NHS in the UK?
Mounjaro is available through NHS specialist tier 3 weight management services, but access varies significantly by region. You'll need a GP referral and must meet NHS eligibility criteria (BMI ≥30, or ≥27.5 with weight-related comorbidities). Waiting lists can be very long — many areas have waits of 6–12 months or more. Private prescription routes are typically faster.
What's the difference between Mounjaro and Wegovy when it comes to bloating?
Both Mounjaro (tirzepatide) and Wegovy (semaglutide) slow gastric emptying and can cause bloating initially. Mounjaro uses a dual GIP/GLP-1 mechanism versus Wegovy's single GLP-1 action, but both typically produce similar bloating in early weeks. Individual responses vary — some people tolerate one better than the other. Your prescriber can discuss which is more suitable for you.
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.