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 15mg Price in the UK
The cost of Mounjaro 15mg in the UK varies significantly depending on whether you access it through the NHS or a private prescription. Mounjaro (tirzepatide) is the maximum dose available, typically reached after weeks of dose titration starting from 2.5mg. Pricing, availability, and eligibility depend on your route of access and your individual health circumstances. This guide explains what you can expect to pay and how to access Mounjaro 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 Pricing — NHS vs Private Access
NHS Access: If prescribed through an NHS specialist weight management service, you may not pay for the medication directly — it's provided as part of your treatment plan. However, NHS access to Mounjaro is limited and varies by region. You'll typically need referral from your GP to a tier 3 specialist service, and waiting lists can be lengthy.
Private Prescription: Via private online consultation with a UK-licensed prescriber, Mounjaro 15mg typically costs between £250–£350 per month, depending on the pharmacy and any package deals offered. This price usually covers a four-week supply (one KwikPen containing four doses of 15mg). Some providers offer discounts for bulk orders or annual subscriptions.
Cost Comparison: At the maximum 15mg dose, monthly costs may be higher than lower doses. Many people begin at 2.5mg (lower cost) and titrate upward over 16+ weeks, so your initial expenditure may be less than the maximum-dose price.
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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.
Dose Titration and What Affects Your Price
Mounjaro dosing follows a strict schedule: 2.5mg weeks 1–4, then 5mg, 7.5mg, 10mg, 12.5mg, and finally 15mg — with minimum four weeks between each increase. Most people don't reach 15mg immediately, meaning your first month's cost will be lower than maximum-dose pricing. Individual response varies, so some people achieve their weight loss goals at 10mg or 12.5mg and may not need to progress to 15mg. Use our free GLP-1 weight loss calculator to explore potential outcomes at different dose levels. Your prescriber will assess which dose is right for you based on your individual response and health circumstances.
- 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 15mg available on the NHS?
Mounjaro is NICE-approved for NHS specialist weight management services. However, regional availability is limited and waiting lists can be very long. Access depends on your local Integrated Care Board (ICB). Ask your GP about tier 3 specialist services in your area. Private access is typically faster.
What's the difference between Mounjaro and Wegovy pricing?
Both are prescription-only injectables for weight management. Mounjaro 15mg typically costs £250–£350/month privately. Wegovy's maximum dose (2.4mg) usually costs £129–£200/month privately. Mounjaro uses dual GIP+GLP-1 mechanism versus Wegovy's single GLP-1 mechanism. Individual response and prescriber choice determine which is appropriate for you.
Can I get Mounjaro cheaper if I'm on a lower dose?
Yes. Mounjaro pricing is usually dose-dependent. Starting doses (2.5mg–5mg) cost less than maximum dose (15mg). Since most people titrate gradually over weeks, your initial cost will be lower. Check with your chosen pharmacy for their specific dose pricing. Use our BMI calculator to explore your personal health baseline.
What does the 15mg KwikPen contain?
One KwikPen contains four pre-filled injection pens at 15mg each — a four-week supply (one injection per week). Price usually refers to the full four-week supply, not per injection. After using your four doses, you'll need a new prescription and KwikPen for the following month.
Are there any hidden costs with private Mounjaro prescriptions?
Private prescriptions require an online consultation fee (usually £20–£50) plus the medication cost. Some providers bundle these. Storage and needle disposal costs are minimal. Always check the full quoted price before committing. NHS prescriptions have no medication cost if accessed through specialist services, though GP referral and initial assessment are free.
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.