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 Weight Loss Cost and Access in the UK
Mounjaro (tirzepatide) is a prescription-only weekly weight loss injection available in the UK through both NHS and private routes. If you're considering this treatment, understanding the cost and how to access it is essential. The price varies significantly depending on whether you go through the NHS or obtain a private prescription, and eligibility criteria differ between the two pathways. This guide explains the real costs, access options, and what to expect at each stage of the process.
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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.
Private Prescription Costs and Access Routes
In the UK, private Mounjaro typically costs between £129 and £320 per month, depending on your dose and the provider. A standard 4-week supply (one KwikPen containing four weekly injections) ranges from approximately £150 to £280. The cost per dose increases at lower doses and decreases at higher doses — for example, the starting dose (2.5 mg) may cost more per injection than the maximum dose (15 mg).
- Starting dose (2.5 mg): approximately £35–£50 per injection
- Standard maintenance (5–10 mg): approximately £30–£45 per injection
- Maximum dose (15 mg): approximately £35–£50 per 4-week supply
Private access requires an online consultation with a UK-licensed prescriber. If approved, your prescription is dispensed by a GPhC-registered pharmacy. Most private providers operate on a subscription model, with monthly auto-renewal. Always check whether your chosen provider offers dose flexibility and what happens if you need to pause or stop treatment.
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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.
NHS Access and Specialist Services
NHS tirzepatide is free at the point of use, but access is through specialist tier 3 weight management services — not standard GP prescription. You'll need referral from your GP to your local integrated care board (ICB) specialist weight management service. Waiting times vary dramatically by region; some areas have waiting lists of 12–24 months or longer, whilst others have shorter timescales. Once assessed by the specialist team, treatment is provided free, but availability depends on local commissioning. Not all ICBs currently commission tirzepatide — some still only offer older treatments. Use our free GLP-1 weight loss calculator to estimate potential outcomes, and discuss both routes with your GP to understand your local options.
- 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 between £129–£320 per month depending on your dose. A 4-week supply (one KwikPen with four injections) typically costs £150–£280. Starting doses may cost more per injection than higher maintenance doses. Always confirm the exact price with your provider before starting treatment.
Can I get Mounjaro free on the NHS in the UK?
Yes, but only through specialist tier 3 weight management services via NHS referral. Standard GPs cannot prescribe it. You need referral from your GP to your local integrated care board specialist service. Waiting times vary from months to over a year depending on your region and local commissioning decisions.
What is the difference between NHS and private Mounjaro?
The medication is identical — the difference is access and cost. NHS is free but involves waiting lists and referral to specialist services. Private requires an online consultation with a UK-licensed prescriber, costs £129–£320 monthly, and is typically available much faster. Both require clinical assessment.
How do I get a private Mounjaro prescription in the UK?
Book an online consultation with a UK-registered prescriber. You'll complete a health questionnaire and may have a video or phone assessment. If approved, your prescription is sent to a GPhC-registered pharmacy for dispensing. The entire process typically takes 24–48 hours. You'll need to provide delivery and payment details.
Is Mounjaro cheaper than Wegovy in the UK?
Prices are broadly similar — both typically cost £129–£320 monthly depending on dose and provider. Mounjaro's maximum dose (15 mg) may be slightly cheaper per month than Wegovy's maximum dose (2.4 mg) at some providers, but individual pricing varies. Compare quotes from multiple providers before deciding.
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.