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
Free tracker included with every download this week
What Is Mounjaeo? A UK Health Guide
Mounjaeo is a misspelling or variant name sometimes used when searching for Mounjaro, the prescription weight management injection licensed in the UK. If you're looking for information about GLP-1 or weight loss medications, this guide clarifies what's available in the UK healthcare system. Whether you're exploring NHS guidance on healthy weight management or considering prescription options, understanding the correct names and how these treatments work is essential for making informed health decisions.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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 Mounjaro (Not Mounjaeo)
The term "mounjaeo" appears to be a misspelling of Mounjaro, a prescription-only weight management injection licensed in the UK. Mounjaro contains tirzepatide, a dual GIP and GLP-1 receptor agonist that may help support weight loss alongside a reduced-calorie diet and increased physical activity.
- Mounjaro is a once-weekly injectable medication manufactured by Eli Lilly
- It's available through NHS specialist weight management services or private prescription
- In clinical trials, Mounjaro helped participants lose an average of 15–21% of body weight — though individual results vary significantly
- Adults with a BMI of 30 or above, or 27–29.9 with weight-related health conditions, may be eligible
- It requires a clinical assessment before prescription and regular monitoring during treatment
If you're searching for weight loss information, our free GLP-1 weight loss calculator can help you estimate potential outcomes at different doses, and our BMI calculator shows whether you fall within eligibility ranges.
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
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 Support in the UK
The NHS offers weight management support through a structured pathway. Tier 1 includes self-help tools and community programmes; Tier 2 covers primary care interventions; Tier 3 is where specialist services prescribe medications like Mounjaro; Tier 4 considers bariatric surgery for severe cases.
To access NHS prescription weight loss treatment, speak to your GP about a referral to your local specialist weight management service. Waiting times vary significantly by region. Alternatively, prescription weight loss medications are available privately through UK-licensed online prescribers following a clinical assessment. Both routes require a prescription from a qualified healthcare professional — these are not available over the counter.
Use our free weight converter to track your progress in stone, pounds, or kilograms, whichever feels most natural to you.
- 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 "mounjaeo" a real medication?
Mounjaeo is not a recognised spelling. You're likely searching for Mounjaro (tirzepatide), a prescription weight management injection. Mounjaro is licensed in the UK and available through NHS specialist services or private prescription. Always check the correct spelling with your prescriber or healthcare provider.
What's the difference between Mounjaro and Wegovy?
Both are prescription weight loss injections available in the UK, but they work differently. Mounjaro (tirzepatide) is a dual GIP and GLP-1 agonist; Wegovy (semaglutide) is a GLP-1 agonist only. In clinical trials, both showed similar average weight loss results (14–21% of body weight), but individual responses vary. Your prescriber will assess which is appropriate for you.
Can I get Mounjaro on the NHS?
Yes, Mounjaro is approved for NHS use through specialist tier 3 weight management services. You'll need a GP referral and a clinical assessment. NHS availability and waiting times vary by region (ICB). Private prescription is also available through UK-licensed online prescribers without NHS referral.
What are the main side effects of Mounjaro?
Common side effects include nausea, diarrhoea, constipation, and stomach pain — usually mild and temporary. Serious side effects are rare but can include severe stomach pain (possible pancreatitis) or gallbladder problems. Always report persistent or concerning symptoms to your healthcare provider immediately.
How much weight can I expect to lose with Mounjaro?
Clinical trials showed average weight loss of 15–21% of body weight over 72 weeks, alongside a reduced-calorie diet and increased physical activity. Individual results vary significantly — some people lose more, others less. Our free GLP-1 weight loss calculator provides estimates based on current research, but a prescriber can give you personalised guidance.
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.