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 Manjano? UK Health Information
Manjano is not a recognised or licensed weight loss medication in the UK. If you're searching for information about weight management injections, you may be looking for medications like Mounjaro (tirzepatide) or Wegovy (semaglutide), which are prescription-only treatments available through NHS specialist services or private prescribing. This guide explains what licensed options are available, how they work, and how to access proper NHS health advice on weight management through your GP.
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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.
Licensed Weight Loss Medications in the UK
The UK has three prescription-only medications licensed specifically for weight management in adults:
- Mounjaro (tirzepatide) — a once-weekly injection that activates dual GIP and GLP-1 hormone pathways. Clinical trials showed average weight loss of 15–21% of body weight when combined with a reduced-calorie diet and increased physical activity.
- Wegovy (semaglutide) — a once-weekly GLP-1 receptor agonist injection. The STEP-1 clinical trial demonstrated approximately 15% average body weight loss at the maximum dose of 2.4 mg.
- Saxenda (liraglutide) — a daily GLP-1 injection, the older option. Less commonly prescribed in the UK now.
All three are prescription-only and require a clinical assessment by a licensed prescriber to determine eligibility. Access through the NHS involves referral to a tier 3 specialist weight management service, which varies significantly by region and waiting times.
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 healthy weight management pathway begins with your GP. Your GP can assess your current weight using our free BMI calculator and discuss whether you meet eligibility criteria — typically a BMI of 30 or above, or 27–29.9 with weight-related health conditions like type 2 diabetes or high blood pressure. Your GP may refer you to tier 3 specialist services where prescription medications may be considered alongside lifestyle support. If you prefer private access, weight loss medications are available through GPhC-registered online pharmacies following a remote clinical assessment with a UK-licensed prescriber.
- 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 manjano available in the UK?
No. Manjano is not a recognised or licensed weight loss medication in the UK. You may be thinking of Mounjaro or Wegovy, which are prescription-only weight management injections. Check the spelling of any medication you're researching and confirm it's licensed by the MHRA.
What should I do if I'm looking for weight loss treatment?
Start by speaking to your GP about weight management options. They can assess your BMI using our free BMI calculator, discuss your health history, and refer you to NHS specialist services if appropriate. Alternatively, prescription weight loss medications are available privately through licensed online prescribers.
How do Mounjaro and Wegovy differ?
Both are once-weekly injections licensed for weight management in the UK. Mounjaro (tirzepatide) uses a dual GIP+GLP-1 mechanism and showed 15–21% average weight loss in trials. Wegovy (semaglutide) is a GLP-1 agonist with approximately 15% average weight loss. Individual results vary significantly.
Can I get weight loss injections on the NHS?
Yes, but access is through tier 3 specialist weight management services via GP referral. Availability and waiting times vary significantly by region. Private prescribing through online consultations is an alternative if you meet clinical eligibility criteria.
What's the difference between Wegovy and Ozempic?
Both contain semaglutide but are different medicines. Wegovy is licensed in the UK specifically for weight management at doses up to 2.4 mg. Ozempic is licensed for type 2 diabetes at doses up to 2 mg — using it for weight loss is off-label. Always use the correct licensed medication as prescribed.
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.