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 Cost and Access in the UK
Mounjaro (tirzepatide) pricing in Europe varies significantly by country, but in the UK, costs depend on whether you access the medication through the NHS or privately. This guide explains UK pricing, how to access Mounjaro as a prescription-only medicine, and the differences between NHS and private routes. Understanding your options helps you make informed decisions about weight management treatment in the UK.
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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.
Mounjaro Cost: NHS vs Private Access in the UK
NHS Access: Mounjaro is available through NHS specialist weight management services (tier 3 and tier 4), but access varies significantly by region. In some areas, it may be available without charge through the NHS, whilst in others, waiting lists are extremely long or access is limited. You typically cannot get Mounjaro directly from your GP — you must be referred to a specialist weight management service, which can involve months of waiting.
Private Access: Through private prescription routes in the UK, Mounjaro costs typically range from £150 to £320 per month, depending on your dose and the provider. A single KwikPen (containing 4 weekly doses) usually costs between £150 and £220. The dose-based pricing breakdown: lower starting doses (2.5–5 mg) are at the lower end; higher maintenance doses (10–15 mg) are at the premium end. Private online prescribing services conduct clinical assessments before issuing a prescription to a GPhC-registered pharmacy.
Costs can be reduced through patient assistance programmes offered by manufacturers in some cases, though eligibility varies. Always check directly with your chosen provider for current pricing and any available discounts.
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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.
How to Access Mounjaro: The Private Prescription Route
Accessing Mounjaro privately in the UK involves an online clinical assessment with a UK-licensed prescriber. The process typically takes 24–48 hours: complete a detailed health questionnaire, discuss your medical history and weight management goals, and the prescriber assesses your eligibility based on BMI and health factors. If approved, a prescription is issued to a GPhC-registered pharmacy, which dispenses and delivers your medication. Use our free BMI calculator above to check your starting point before your consultation.
Private access is faster than NHS referral routes but requires you to pay the full cost. Importantly, prescription weight loss medication should be used alongside lifestyle changes — dietary modifications and increased physical activity. Our GLP-1 weight loss calculator can help you estimate potential results with Mounjaro at different doses, and our progress tracker lets you log your weight loss journey.
- 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.
Why does Mounjaro cost more in some UK regions than others?
Pricing varies between private providers based on their operating costs, supplier agreements, and overheads. NHS availability also differs by region — some areas have better access through specialist services whilst others have very limited options. Always compare pricing across a few reputable providers before committing.
Is Mounjaro available on the NHS in the UK?
Yes, but access is limited to NHS specialist weight management services (tier 3/4) and varies greatly by region. NICE has approved tirzepatide for NHS use, but availability depends on your local Integrated Care Board (ICB) funding and waiting lists can be extremely long. Ask your GP about NHS referral options in your area.
What does a Mounjaro KwikPen cost privately?
A single KwikPen (4 weekly doses) typically costs £150–£220 privately in the UK, depending on the dose strength and provider. Lower starting doses (2.5–5 mg) are usually cheaper; higher doses (10–15 mg) cost more. Total monthly costs range from approximately £150–£320.
Can I get a discount on Mounjaro prescription costs?
Some manufacturers offer patient assistance or support programmes, but eligibility varies. Check with your provider or prescriber about available schemes. Some private services occasionally offer package discounts for longer-term commitments, though this varies.
How long does it take to get Mounjaro on private prescription?
The private route is faster than NHS referral. Most online prescribing services complete assessment and issue a prescription within 24–48 hours, with medication delivered within 2–5 working days. NHS referral can involve waiting lists of months to over a year depending on your region.
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.