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 Mounjora? A UK Health Guide to Weight Management
Mounjora is not a currently recognised medication name in the UK weight management landscape. You may be searching for Mounjaro (tirzepatide) or Wegovy (semaglutide), both of which are prescription-only weight management injections available through NHS specialist services or private prescribing. This guide clarifies what these licensed medications are, how they work, and who may be eligible. Understanding your options for healthy weight management is an important first step — whether through lifestyle changes, prescription medication, or a combination of both. Our free BMI calculator and GLP-1 weight loss calculator can help you explore where you currently stand and what outcomes might look like with professional support.
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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.
Understanding Licensed Weight Management Injections in the UK
If you've heard the term "mounjora" in conversations about weight loss, you may be encountering a misspelling or variation of Mounjaro (tirzepatide), which is a prescription-only weight management injection licensed in the UK. Mounjaro is manufactured by Eli Lilly and works as a dual GIP and GLP-1 receptor agonist — meaning it activates two natural hormone pathways that help regulate appetite and blood sugar control.
- Mounjaro: Once-weekly injection, doses from 2.5 mg to 15 mg, approved for adults with a BMI of 30 or above, or 27+ with weight-related health conditions like type 2 diabetes or high blood pressure
- Wegovy (semaglutide): Alternative GLP-1 injection, also once-weekly, doses up to 2.4 mg — similar eligibility criteria
- Both are prescription-only: Require a clinical assessment by a licensed prescriber before dispensing
In clinical trials, Mounjaro helped participants lose an average of 15–21% of their body weight over 72 weeks, alongside a reduced-calorie diet and increased physical activity. Individual results vary significantly. Always consult your GP or a licensed prescriber to determine which medication, if any, is suitable for your circumstances.
Clinically BackedWeight Loss
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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.
How to Access Weight Management Treatment in the UK
Access to Mounjaro and similar weight management medications in the UK follows two main routes. The NHS route involves referral to a specialist tier 3 weight management service through your GP, where a multidisciplinary team assesses your eligibility and prescribes treatment. NHS availability varies significantly by region and waiting lists can be lengthy. The private route allows you to have an online consultation with a UK-licensed prescriber, and if appropriate, the prescription is dispensed by a GPhC-registered pharmacy without NHS referral.
Before pursuing any weight management treatment, understand your current health status. Use our free weight converter to track measurements in both kg and stone, and try our BMI calculator to see where you fall on the NHS healthy weight scale. A healthy BMI is 18.5–24.9 for most adults, though lower thresholds apply for some ethnic groups. Weight management medications work best alongside dietary changes and increased physical activity — they are not a standalone solution.
- 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 Mounjoro the same as Mounjaro?
Mounjoro is likely a misspelling of Mounjaro (tirzepatide). Mounjaro is the licensed UK brand name for this weight management injection. Always ensure you have the correct spelling when discussing medications with your GP or prescriber to avoid confusion.
How much weight can I expect to lose with Mounjaro?
Clinical trials showed participants lost an average of 15–21% of their body weight over 72 weeks at the highest dose (15 mg), alongside diet and exercise. Individual results vary considerably. Some people lose more, others less. Your prescriber can discuss realistic expectations based on your personal health profile.
Can I get Mounjaro on the NHS in the UK?
Yes, Mounjaro is available through NHS specialist weight management services, but access varies by region and is typically available at tier 3 or 4 of the NHS weight management pathway. Your GP can refer you, but waiting lists may be several months. Private access is also available through online prescribers.
What are the main side effects of Mounjaro?
Very common side effects include nausea, diarrhoea, vomiting, constipation, and stomach pain. These often improve over time as your body adjusts. Less common side effects include fatigue, dizziness, and injection site reactions. Serious side effects are rare but include severe stomach pain (possible pancreatitis) — seek immediate medical attention if this occurs.
Do I need to follow a diet while taking Mounjaro?
Yes. Mounjaro works best alongside a reduced-calorie diet and increased physical activity. The medication helps reduce appetite and cravings, but weight loss still requires a calorie deficit. Your GP or prescriber will discuss dietary and exercise recommendations tailored to your needs.
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.