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- How GLP-1 medications work
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- Side effects & solutions
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- FAQs answered
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Mounjaro 15mg Price Comparison in the UK
Mounjaro (tirzepatide) at the maximum 15mg dose is available in the UK through both NHS specialist services and private prescription routes. Costs vary significantly depending on which route you choose and where you access treatment. This guide explains the current price landscape for Mounjaro 15mg in the UK, how NHS access works, what private prescriptions typically cost, and what factors affect pricing across different providers. We'll help you understand your options so you can make an informed decision about weight management treatment.
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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 Mounjaro 15mg Costs in the UK
Private Mounjaro 15mg typically costs between £250 and £350 per month in the UK, though prices vary by provider. Most private prescribing services charge per KwikPen (4-week supply) rather than per injection. At the maximum 15mg dose, you're using the highest-strength pen, which generally costs more than lower doses like 5mg or 10mg.
What affects the price:
- Dose level — 15mg is the maximum, so costs are typically at the higher end
- Consultation fees — some providers include GP consultations, others charge separately (typically £20–£50)
- Service model — some offer subscription/ongoing management, others one-off prescriptions
- Pharmacy location — prices vary slightly between different UK-registered online pharmacies
- Repeat prescriptions — some providers offer discounts for continued treatment
All private Mounjaro prescriptions must come from a UK-licensed prescriber and be dispensed by a GPhC-registered pharmacy. This is a legal requirement and ensures you're receiving genuine, quality-assured medication.
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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.
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NHS vs Private: Access Routes for Mounjaro
NHS access: Mounjaro (tirzepatide) is approved by NICE for use in NHS specialist weight management services. However, NHS availability is limited and varies by region. You'll typically need a GP referral to tier 3 specialist weight management services, and waiting lists can be several months to over a year in many areas. Once approved, the NHS covers the cost entirely.
Private access: You can access Mounjaro privately without an NHS referral by consulting a UK-licensed prescriber online. The consultation process usually takes 10–20 minutes, and if approved, your prescription is sent to a GPhC-registered pharmacy for dispensing. This route is faster but involves out-of-pocket costs. Use our GLP-1 weight loss calculator to estimate potential outcomes and help inform your decision about treatment.
Online private consultation process: Most private providers operate similarly: complete an online health questionnaire, have a video or phone consultation with a UK prescriber, receive a prescription if clinically appropriate, and collect your Mounjaro from a registered pharmacy. The entire process typically takes 1–3 working days. Your prescriber will assess your eligibility based on your BMI, health conditions, and medication history — not everyone will be approved. Honesty about your health history is essential for safe prescribing.
- 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 15mg cost on the NHS in the UK?
Mounjaro 15mg is free on the NHS if prescribed through specialist tier 3 weight management services. However, NHS access requires a GP referral and specialist assessment, and waiting times vary by region — some areas have waiting lists of 12+ months. Availability depends on your local ICB (Integrated Care Board) commissioning decisions.
Why does Mounjaro cost more at the 15mg dose than lower doses?
The 15mg dose is the maximum strength available, and each KwikPen contains 4 injections at that dose. Higher-strength medications generally carry higher manufacturing and supply costs. Additionally, the 15mg pen is typically only prescribed after dose titration, meaning patients have already committed to treatment.
Are there cheaper alternatives to Mounjaro 15mg in the UK?
Wegovy (semaglutide) is another prescription weight loss injection available in the UK, with costs typically between £150–£250 monthly depending on dose. Saxenda (liraglutide) is an older GLP-1 injection available on the NHS and privately. Clinical trials suggest Mounjaro may offer slightly higher weight loss, but individual results vary and individual needs differ.
Can I get a private Mounjaro prescription without seeing a GP first?
Yes. Private online prescribers can issue Mounjaro prescriptions directly following an online consultation — you don't need a GP referral. However, the prescriber will ask detailed health questions and may request information from your NHS records to ensure it's safe for you. This process is faster than NHS referral but involves private costs.
Does the price of Mounjaro 15mg include the consultation fee?
This varies by provider. Some private services bundle the prescription and consultation into one monthly fee (typically £250–£350), while others charge consultation fees separately (£20–£50). Always check the full cost breakdown before committing, including any follow-up consultation charges if you need dose adjustments or ongoing management.
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.