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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Compare Mounjaro Prices in the UK
Mounjaro (tirzepatide) prices in the UK vary significantly depending on whether you access it through the NHS or privately. If you're considering this prescription-only weight management injection, understanding the cost differences and eligibility routes is essential. This guide explains both pathways, what affects pricing, and how to determine which route may be suitable for you based on your circumstances.
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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 vs Private Access — What You Need to Know
NHS access to Mounjaro: NICE (National Institute for Health and Care Excellence) has approved tirzepatide for use within NHS specialist weight management services. However, NHS access is limited to tier 3 and tier 4 specialist weight management services — not available through standard GP prescription. You'll typically need referral from your GP to a specialist service in your region. Availability varies significantly by area, and waiting lists can extend several months to over a year depending on your local Integrated Care Board (ICB). When prescribed through the NHS, there is no direct cost to you at the point of use.
Private access to Mounjaro: Private prescriptions are available through GPhC-registered online pharmacies following a clinical assessment with a UK-licensed prescriber. Private costs typically range from £150 to £300+ per month depending on your dose. Starting doses (2.5 mg) are generally cheaper than maximum maintenance doses (15 mg). Private access does not require NHS referral and is often faster — typically available within days rather than months. You can also compare Mounjaro prices with Wegovy (semaglutide), another GLP-1 injection, which may have different pricing structures.
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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.
Cost Factors and Practical Considerations
Several factors influence what you'll pay for Mounjaro privately: your starting dose, whether you're titrating (gradually increasing) or at a maintenance dose, and the specific pharmacy you use. A standard 4-week supply of a single dose (one KwikPen with 4 injections) costs between £150–£250 privately, though this varies. NHS eligibility requires a BMI of 30 or above, or 27–29.9 with weight-related health conditions like type 2 diabetes, hypertension, or sleep apnoea. If you're waiting for NHS assessment or don't meet current availability criteria in your area, private access can be an alternative. Use our free BMI calculator to check where you stand, and our GLP-1 weight loss calculator can help you estimate potential outcomes alongside cost considerations.
- 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.
How much does Mounjaro cost privately in the UK?
Private Mounjaro costs typically range from £150 to £300+ per month depending on your dose. Lower starting doses (2.5 mg) are cheaper, while higher maintenance doses (15 mg) cost more. Prices vary between pharmacies, so it's worth comparing. This is the cost you pay directly out of pocket.
Is Mounjaro available on the NHS in the UK?
Yes, NICE has approved tirzepatide (Mounjaro) for NHS use, but only through specialist tier 3 and tier 4 weight management services. You cannot get it through standard GP prescription. You'll need referral to your regional specialist service, and availability varies by area with waiting lists often very long.
What's the difference between NHS and private Mounjaro access?
NHS access is free at point of use but requires specialist referral and can involve months-long waits. Private access has upfront costs (£150–£300+/month) but is faster, doesn't require NHS referral, and doesn't depend on regional availability. Both require a clinical assessment before prescription.
Do I qualify for NHS Mounjaro?
You may qualify if you have a BMI of 30 or above, or 25–29.9 with weight-related health conditions. South Asian, Chinese, Black African, or Black Caribbean adults may qualify at lower BMI thresholds. Your GP can assess eligibility and refer you to a specialist service if appropriate.
How does Mounjaro pricing compare to Wegovy?
Mounjaro and Wegovy (semaglutide) have similar private pricing (around £150–£300/month), but costs can vary by dose and provider. Mounjaro uses a different mechanism (dual GIP+GLP-1 agonist) versus Wegovy (GLP-1 only). Your prescriber can advise which may be more suitable and discuss pricing with you.
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.