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
Is Manjero a Real Weight Loss Medication in the UK?
"Manjero" is not a recognised weight loss medication in the UK or anywhere else. You may have encountered this term online, but it's not an approved prescription medicine. If you're searching for information about weight loss injections available in the UK, there are three licensed GLP-1 medications with proven NHS guidance backing. This guide clarifies what's real, what works, and how to access genuine weight management support through UK health services.
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.
Real Weight Loss Injections Licensed in the UK
Three prescription-only weight loss injections are currently licensed for use in the UK:
- Mounjaro (tirzepatide) — a dual GIP and GLP-1 receptor agonist approved for weight management. Once-weekly injection with doses ranging from 2.5 mg to 15 mg. Clinical trials showed average weight loss of 15–21% of body weight.
- Wegovy (semaglutide) — a GLP-1 receptor agonist licensed for weight loss. Once-weekly injection with a maximum dose of 2.4 mg. STEP trials demonstrated average weight loss of approximately 15% of body weight.
- Saxenda (liraglutide) — a daily GLP-1 injection (not weekly) with a maximum dose of 3 mg per day. Results vary based on individual response.
All three are prescription-only medicines requiring a clinical assessment before dispensing. They are not available without a prescription, and access in the UK is through NHS specialist weight management services or private online prescribing.
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.
Why "Manjero" Might Confuse Your Search
Search engines occasionally pick up misspelled or altered drug names, especially when people are searching on mobile devices or with voice commands. "Manjero" could be a typo for Mounjaro, which is a genuine medication. Always verify medication names through NHS resources or your GP to avoid confusion. If you're exploring weight loss options in the UK, use the GLP-1 weight loss calculator on this page to understand how these real medications might affect potential weight loss, and check your healthy weight range using the BMI calculator. Your GP can assess whether you're eligible for prescription weight loss treatment based on your individual health.
- 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 Manjero the same as Mounjaro?
No. Manjero is not a real medication. You may be thinking of Mounjaro (tirzepatide), which is a genuine prescription weight loss injection licensed in the UK. Always check the exact spelling of any medication with your GP or pharmacist.
What's the difference between Mounjaro and Wegovy?
Mounjaro (tirzepatide) is a dual GIP/GLP-1 agonist with a maximum dose of 15 mg weekly. Wegovy (semaglutide) is a GLP-1 agonist with a maximum dose of 2.4 mg weekly. Both are once-weekly injections. Clinical trials show Mounjaro may produce slightly higher average weight loss, but individual results vary significantly.
Can I get weight loss injections on the NHS?
Yes, through NHS specialist tier 3 weight management services. You'll need a GP referral. Availability varies significantly by region. Private access is also available through online prescribers following a clinical assessment. Waiting times for NHS services can be lengthy in many areas.
How do GLP-1 medications work for weight loss?
GLP-1 receptor agonists mimic the natural hormone glucagon-like peptide-1, which regulates appetite and blood sugar. They signal fullness to the brain, reduce food cravings, and slow how quickly food leaves the stomach. This helps people feel satisfied with smaller meals.
What should I do if I'm looking for weight loss medication?
Speak to your GP first. They can assess your BMI, health conditions, and eligibility. Use the BMI calculator on this page to check your personal BMI. Your GP can refer you to NHS specialist services or discuss private options. Remember that medication works alongside diet and physical activity, not instead of them.
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.