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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Moujarno — Understanding This UK Weight Management Option
Moujarno is a prescription-only weight management injection available in the UK. If you've heard about this medication and want to understand how it fits into UK health guidance, what it does, and whether it might be right for you, this UK health guide covers everything you need to know. We'll explore how the NHS approaches weight management, UK eligibility criteria, and the practical steps to access treatment through either NHS specialist services or private prescription routes.
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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.
What You Need to Know About Moujarno in the UK
Moujarno is the brand name for tirzepatide, a prescription-only injection licensed for weight management in UK adults. It's a dual GIP and GLP-1 receptor agonist, meaning it works on two natural hormone pathways to help regulate appetite and support feeling fuller after meals. This dual mechanism distinguishes it from single-action GLP-1 medications like Wegovy (semaglutide).
In clinical trials, Moujarno helped participants lose an average of 15–21% of their body weight over 72 weeks, though individual results vary significantly. The medication is administered as a once-weekly injection, with doses ranging from 2.5 mg up to 15 mg. Moujarno works alongside a reduced-calorie diet and increased physical activity — it's not a replacement for lifestyle changes but a support tool. Common side effects include nausea, diarrhoea, constipation, and stomach discomfort, which typically improve over time as your body adjusts.
Use our free BMI calculator above to check whether you might meet the initial eligibility criteria for weight management treatment in the UK.
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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 Moujarno in the UK — NHS and Private Routes
In the UK, Moujarno access depends on your route. Via the NHS: NICE has approved tirzepatide for specialist weight management services (tier 3/4). You'll need a GP referral to a specialist service, and availability varies significantly by region — waiting lists can be lengthy. Via private prescription: You can access Moujarno through an online consultation with a UK-licensed prescriber, followed by dispensing from a GPhC-registered pharmacy, without an NHS referral.
Whichever route you choose, a clinical assessment is essential. Your prescriber will review your health history, BMI, weight-related conditions (such as type 2 diabetes, high blood pressure, or cardiovascular disease), and any medications you're taking. Use our weight converter if you need to check your weight in different units — many prescribers work in both metric and imperial measurements.
- 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.
Who is eligible for Moujarno in the UK?
UK adults with a BMI of 30 kg/m² or above, or 25–29.9 with weight-related health conditions, may be eligible. Lower thresholds apply for South Asian, Chinese, Black African, or Black Caribbean heritage adults due to higher health risks at lower BMI. Your GP or prescriber will assess your individual circumstances.
How long does Moujarno take to work?
Most people notice changes in appetite and fullness within the first 2–4 weeks of starting Moujarno. Measurable weight loss typically appears after 4–8 weeks. Peak effects are usually seen around week 16 onwards. Results vary based on your starting weight, diet, and activity level.
Can I get Moujarno on the NHS in my area?
NICE has approved tirzepatide, but NHS access depends on your region (ICB) and local specialist services availability. Contact your GP to ask about referral to a tier 3 weight management service, or enquire about waiting lists in your area.
What's the difference between Moujarno and Wegovy?
Moujarno (tirzepatide) is a dual GIP and GLP-1 agonist; Wegovy (semaglutide) is a GLP-1 agonist only. Moujarno typically produces greater average weight loss in clinical trials, though individual results vary. Wegovy may suit some people better. Both require prescription and clinical assessment.
What if I miss a dose of Moujarno?
If you miss an injection within 4 days of your scheduled date, take it as soon as you remember and continue your regular weekly schedule. If more than 4 days have passed, skip the missed dose and inject on your normal day. Never double up doses.
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.