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
Manjourno — What You Need to Know
Manjourno is not a recognised weight management medication licensed in the UK. If you've seen this term online, it may be a misspelling, unverified product, or unregulated treatment. This guide explains what actual, evidence-based weight loss options are available through the NHS and UK private healthcare, and why getting accurate health information matters. Always consult your GP before starting any weight management treatment.
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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.
Actual UK-Licensed Weight Management Medications
The UK has three prescription-only medications licensed specifically for weight management in adults:
- Mounjaro (tirzepatide) — dual GIP and GLP-1 receptor agonist, once-weekly injection, doses 2.5 mg to 15 mg. Clinical trials showed average weight loss of 15–21% of body weight alongside diet and activity changes.
- Wegovy (semaglutide) — GLP-1 receptor agonist, once-weekly injection, doses 0.25 mg to 2.4 mg. STEP trial data showed average weight loss of approximately 15% of body weight.
- Saxenda (liraglutide) — GLP-1 receptor agonist, once-daily injection, doses 0.6 mg to 3 mg. Effective for weight management in UK adults meeting eligibility criteria.
All three require a prescription from a UK-licensed prescriber following a clinical assessment. Eligibility typically includes BMI 30 or above, or BMI 27–29.9 with weight-related health conditions. Try our GLP-1 weight loss calculator to explore potential results with licensed medications.
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 Safe Weight Loss Treatment in the UK
Weight management is available through two main routes in the UK. The NHS route involves referral to a tier 3 specialist weight management service via your GP, though waiting lists vary by region. The private route offers faster access through GPhC-registered online pharmacies following an online clinical assessment with a UK-licensed prescriber.
Before pursuing any weight loss treatment, calculate your BMI using our free BMI calculator to understand your current health status. Your GP can also provide personalised nhs health advice about whether medication is suitable for you. Sustainable weight management combines prescription support with reduced-calorie diet and increased physical activity — medications are not a substitute for lifestyle changes.
- 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.
What is Manjourno?
Manjourno is not a recognised weight management medication licensed in the UK or by major health regulators. If you've encountered this term, it may be a misspelling, unverified product, or unregulated treatment. Always verify medication names through the MHRA or your GP, and be cautious of unregulated weight loss products online.
What are the actual licensed weight loss injections in the UK?
The three prescription-only weight loss injections licensed in the UK are Mounjaro (tirzepatide), Wegovy (semaglutide), and Saxenda (liraglutide). All require a prescription following a clinical assessment. Individual results vary significantly. Use our GLP-1 calculator to explore potential outcomes.
How do I know if a weight management medication is genuine?
Only take medications prescribed by a UK-licensed prescriber through the NHS or a GPhC-registered pharmacy. Check the MHRA website for approved medicines. Be wary of unverified product names, overseas suppliers without UK regulation, or extremely cheap medications — these are warning signs of unregulated products.
Can my GP prescribe weight loss medication?
Your GP can refer you to NHS specialist tier 3 weight management services where prescription medications may be offered. Alternatively, private GPhC-registered online pharmacies can prescribe licensed weight loss medications following an online clinical assessment. NHS access varies significantly by region.
What's the difference between healthy weight management and unregulated treatments?
Safe, evidence-based weight management combines prescribed medications (if appropriate), reduced-calorie diet, increased activity, and GP support. Unregulated treatments lack clinical testing, carry unknown risks, and often make unrealistic claims. Always use our healthy weight UK guidance, speak to your GP, and check the MHRA before starting any treatment.
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.