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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What Is Moujourno and How Does It Work in the UK?
Moujourno appears to be a search variation or alternative spelling related to weight management medications available in the UK. If you're looking for information about prescription weight loss injections, MyWeightCheck provides comprehensive UK health guides on medications like Mounjaro and Wegovy. These are licensed prescription-only treatments that work alongside healthy weight management. Our NHS guidance explains eligibility criteria, how these medications function, and what to expect. Whether you're exploring options through NHS health advice or considering private prescribing, understanding the facts helps you make informed decisions about your health.
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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.
How Weight Management Medications Work
Weight management medications available in the UK work by activating natural hormone pathways in the body. GLP-1 receptor agonists like Wegovy signal to your brain that you feel full, reduce food cravings, and slow how quickly food leaves your stomach. Dual GIP/GLP-1 agonists like Mounjaro activate two hormone pathways, offering a different mechanism for appetite regulation.
These prescription medications are not replacements for healthy weight management. Instead, they're tools used alongside a reduced-calorie diet and increased physical activity. Clinical trials show that participants using these medications lost an average of 15–21% of body weight, though individual results vary significantly. Your prescriber will assess whether a medication is suitable based on your personal health profile, BMI, and any weight-related health conditions.
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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.
UK Eligibility and NHS Access Routes
In the UK, prescription weight loss medications are available through two main routes. NHS access requires referral to a specialist tier 3 weight management service through your GP, though availability varies by region and waiting lists can be lengthy. Private prescribing is available through registered online healthcare providers following a clinical assessment—no NHS referral needed.
You may be eligible if you have a BMI of 30 or above, or a BMI of 27–29.9 with weight-related health conditions like type 2 diabetes, high blood pressure, or sleep apnoea. Adults of South Asian, Chinese, Black African, or Black Caribbean heritage may qualify at lower BMI thresholds due to higher health risks. Use our free BMI calculator to check where you fall, then discuss options with your GP or a licensed prescriber.
- 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 there a medication called "moujourno"?
"Moujourno" doesn't appear to be an official UK medication name. You may be searching for Mounjaro (tirzepatide) or Wegovy (semaglutide)—both are licensed weight management injections in the UK. MyWeightCheck provides detailed information on both medications, including how they work, side effects, and eligibility criteria.
What's the difference between these weight loss injections?
Mounjaro is a dual GIP/GLP-1 agonist (maximum 15 mg weekly), while Wegovy is a GLP-1 agonist (maximum 2.4 mg weekly). Clinical trials show both help with weight loss—results average 15–21% body weight reduction, though individual outcomes vary. Your prescriber will discuss which suits your health profile.
Can I get these medications through the NHS?
Yes, both Mounjaro and Wegovy are available through NHS specialist weight management services, though access varies by region and waiting lists exist. They're also available privately through registered UK prescribers following an online clinical assessment. MyWeightCheck provides NHS health information to help you explore both routes.
How do I know if I'm eligible for weight loss medication?
Use our free BMI calculator to check your current BMI. If it's 30 or above, or 27–29.9 with health conditions like diabetes or high blood pressure, you may be eligible. Book a GP appointment to discuss NHS options, or contact a private prescriber for a clinical assessment. Your health history determines suitability.
Are these medications safe long-term?
Clinical trials show these medications are generally well-tolerated, though side effects like nausea and digestive changes are common, especially when starting. UK health guidance emphasises that these are prescription-only medicines requiring ongoing prescriber support. Always discuss any concerns with your healthcare provider, and inform them of all medications you're taking.
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.