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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Finding the Best Mounjaro Provider in the UK
If you're looking for Mounjaro (tirzepatide) in the UK, you have two main routes: NHS specialist weight management services or private prescribing. The best provider depends on your eligibility, location, and whether you want NHS-funded treatment or are willing to access it privately. This guide explains both pathways, eligibility criteria, and how to find a registered provider that meets your needs.
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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.
NHS Mounjaro Access: Eligibility and Tier 3 Services
NICE has approved tirzepatide (Mounjaro) for use within the NHS, but access is through specialist tier 3 weight management services, not standard GP prescription. Your GP can refer you to your local tier 3 service if you meet eligibility criteria.
- BMI 30 or above, or BMI 27–29.9 with weight-related health conditions (type 2 diabetes, high blood pressure, sleep apnoea, cardiovascular disease)
- Lower thresholds for South Asian, Chinese, Black African, and Black Caribbean adults: BMI 27.5 or above due to higher disease risk at lower weights
- Age 18 or over and not pregnant or breastfeeding
NHS availability varies significantly by region. Some areas have well-established tier 3 services with relatively short waiting times; others have lengthy waiting lists of 6–12 months or longer. Contact your GP to check what's available in your ICB (Integrated Care Board) area.
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.
Private Mounjaro: How to Access It Quickly
Private prescribing allows access to Mounjaro without NHS referral or waiting lists. You complete an online consultation with a UK-licensed prescriber, provide health information, and receive a prescription if clinically appropriate. Dispensing is then handled by GPhC-registered pharmacies.
Private costs range from approximately £129–£320 per month depending on dose. Starting doses (2.5–5 mg) are typically cheaper than maintenance doses (10–15 mg). Private providers offer flexibility—you can start immediately and adjust doses weekly under prescriber guidance, rather than waiting months for NHS assessment.
Using our free GLP-1 weight loss calculator can help you estimate potential outcomes at different doses before you commit to either route.
Key differences: NHS is free but involves waiting and referral; private is fast but costs money. Both require a clinical assessment—no reputable provider will dispense Mounjaro without evaluating your health status first. Whatever route you choose, expect ongoing support from a qualified healthcare professional who monitors your progress and adjusts your dose.
- 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's the difference between NHS and private Mounjaro in the UK?
NHS access is free but involves referral to tier 3 services and potential waiting lists. Private access is faster—usually within days—but costs money (typically £129–£320/month depending on dose). Both require a prescription from a UK-licensed prescriber and proper clinical assessment.
How do I know if I'm eligible for Mounjaro on the NHS?
You need a BMI of 30 or above, or 27–29.9 with weight-related health conditions like type 2 diabetes or high blood pressure. Lower thresholds apply if you're of South Asian, Chinese, Black African, or Black Caribbean heritage. Ask your GP to refer you to your local tier 3 weight management service.
How long are NHS waiting lists for Mounjaro?
Waiting times vary significantly by region. Some areas offer assessment within weeks; others have waiting lists of 6–12 months or longer. Contact your local ICB or ask your GP what the current wait is in your area.
Can I switch from NHS to private Mounjaro mid-treatment?
Yes, you can switch between routes, but discuss this with your current prescriber first. If switching from NHS to private, your private prescriber will need to assess your current dose and adjust accordingly. There's no automatic transfer of medical records between NHS and private services.
What should I look for in a Mounjaro provider?
Ensure they're GPhC-registered (if prescribing privately) or NHS-approved (if tier 3). They should ask detailed health questions, explain side effects honestly, provide clear dosing guidance, and offer ongoing support. Avoid providers that studied results or skip clinical assessment—any legitimate prescriber will take your health history seriously.
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.