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 Price in the UK — NHS and Private Options
Mounjaro (tirzepatide) is a prescription-only weight management injection available in the UK through both NHS specialist services and private prescribing routes. The cost varies significantly depending on whether you access it through the NHS or privately. This guide explains UK pricing, how to access Mounjaro through the NHS, private costs, and what affects the overall expense of treatment. Understanding your options helps you make an informed decision about weight management.
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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.
NHS Access and Eligibility for Mounjaro in the UK
NHS access to Mounjaro is through specialist tier 3 and tier 4 weight management services, not standard GP prescription. Your GP can refer you to these specialist services if you meet eligibility criteria.
- BMI of 30 kg/m² or above, OR BMI of 27–29.9 kg/m² with weight-related health conditions (type 2 diabetes, prediabetes, hypertension, dyslipidaemia, or sleep apnoea)
- Lower thresholds apply for South Asian, Chinese, Black African, and Black Caribbean adults (BMI 27.5 or above)
- Must have tried lifestyle changes first
NICE has approved tirzepatide for use within NHS specialist weight management services. However, NHS availability is extremely limited — many areas have waiting lists of 12 months or longer. Some ICBs (Integrated Care Boards) have very restricted access or require additional criteria. Costs to the NHS per prescription vary by dose, but patients typically pay nothing (standard prescription charges may apply in England, Scotland, Wales, or Northern Ireland depending on your circumstances).
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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 Cost and Prescription Access in the UK
Private prescriptions for Mounjaro are available through GPhC-registered online pharmacies following an online clinical assessment with a UK-licensed prescriber.
- Starting dose (2.5 mg): approximately £129–£160 per pen
- Standard doses (5–10 mg): approximately £160–£220 per pen
- Higher doses (12.5–15 mg): approximately £220–£320 per pen
- Each pen contains 4 weekly injections (4 weeks' supply)
Private costs depend on the dose you're prescribed and the provider. Treatment typically costs £600–£1,300 per month for ongoing use. A clinical assessment fee (usually £50–£100) applies on your first visit. Many people use private prescribing because NHS waiting times are prohibitively long in their area.
- 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 Mounjaro free on the NHS in the UK?
Mounjaro can be prescribed through NHS specialist tier 3 weight management services if you meet eligibility criteria, though availability is extremely limited and waiting lists are long in most areas. If you access it through the NHS, you typically pay standard prescription charges. Private prescription costs range from £129–£320 per pen depending on dose.
How much does a Mounjaro KwikPen cost privately in the UK?
A private Mounjaro KwikPen costs approximately £129–£160 for the starting 2.5 mg dose, £160–£220 for standard 5–10 mg doses, and £220–£320 for higher 12.5–15 mg doses. Each pen contains 4 weekly injections. Costs vary slightly between private prescribing providers.
Can my GP prescribe Mounjaro directly?
Not routinely. Mounjaro is typically prescribed through NHS specialist tier 3 weight management services, not standard GP practice. Your GP can refer you to these services. Privately, you can obtain a prescription through an online clinical assessment with a UK-licensed prescriber, then have it dispensed by a GPhC-registered pharmacy.
How do I access Mounjaro through the NHS?
Ask your GP for a referral to your local tier 3 or tier 4 weight management service. You must meet eligibility criteria (BMI ≥30 or ≥27 with weight-related health conditions). Many areas have long waiting lists. Your weight management service will assess you and prescribe if appropriate. Use our free BMI calculator above to check your current BMI category.
What's the difference between NHS and private Mounjaro access?
NHS access is free (or standard prescription charges apply) but involves long waiting lists and limited availability. Private access is faster and doesn't require NHS referral, but costs £129–£320 per pen depending on dose. Both routes require clinical assessment. Private is typically chosen when NHS waiting times are unacceptable in your area.
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.