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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Mounjaro Prices Compared — What You'll Pay in the UK
Mounjaro (tirzepatide) pricing in the UK varies significantly depending on whether you access it through the NHS or private providers. This guide compares costs across different pathways, explains what affects pricing, and helps you understand the investment required for this prescription-only weight management injection. Prices, eligibility, and availability differ by region and provider, so understanding your options is essential before starting 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.
How Much Does Mounjaro Cost in the UK?
Mounjaro is available through two main routes in the UK:
- NHS: Typically free if prescribed through specialist tier 3 weight management services (covered by your ICB), though regional availability varies dramatically and waiting lists can be months to years in many areas.
- Private online prescribing: Costs range from approximately £129 to £320 per month depending on dose and provider. Most private providers charge per dose or per four-week supply (four pens).
Pricing usually increases with dose — a starting 2.5 mg dose may cost less than a maintenance 15 mg dose. Some providers offer tiered pricing or subscription discounts. Private costs also reflect prescriber assessment fees (typically £20–£50) and delivery costs. NHS access requires referral to a specialist service and is subject to local commissioning decisions and availability.
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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.
Comparing Mounjaro to Other Weight Loss Options
When comparing prices, it's important to consider the full picture. Wegovy (semaglutide) typically costs £129–£250 per month privately, making it broadly comparable to Mounjaro but with different dosing schedules and mechanisms. Saxenda (liraglutide) is a daily injection costing roughly £120–£180 monthly. Clinical trial data showed Mounjaro may produce slightly larger average weight loss (~20% body weight) compared to Wegovy (~15%), though individual results vary significantly. Try our free GLP-1 weight loss calculator above to estimate potential outcomes and compare options for your situation.
- 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 typical cost of Mounjaro per dose in the UK?
Private Mounjaro costs typically range from £30 to £80 per dose depending on strength (2.5 mg to 15 mg) and provider. A four-week supply (one KwikPen with four doses) costs approximately £129–£320. NHS provision is free if prescribed through specialist services, though regional availability and waiting times vary significantly across England, Scotland, Wales, and Northern Ireland.
Why do Mounjaro prices vary so much between providers?
Prices differ based on dose strength, provider overheads, prescriber assessment fees, delivery costs, and whether discounts apply for ongoing patients. Some private providers offer subscription pricing or bulk discounts for longer commitments. NHS pricing is standardized but affected by regional commissioning and availability of specialist services in your area.
Is Mounjaro cheaper than Wegovy in the UK?
Pricing is broadly comparable — both typically cost £129–£320 monthly privately. Clinical trial data suggested Mounjaro may support slightly larger average weight loss (~20% vs ~15% body weight), though results vary individually. Your choice should be based on clinical suitability, prescriber assessment, and personal factors, not price alone.
Can I get Mounjaro on the NHS?
Yes, but only through specialist tier 3 weight management services following GP referral. Availability depends heavily on your region and ICB commissioning. Many areas have substantial waiting lists. If you don't qualify for NHS access, private online prescribing is available following a clinical assessment with a UK-licensed prescriber.
Does the price change if I increase my Mounjaro dose?
Yes — prices typically increase with dose strength. Starting doses (2.5 mg) cost less than maintenance doses (15 mg). However, many providers use tiered or subscription pricing, so the cost per week may be lower if you commit longer term. Always confirm pricing for your target dose before starting 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.