The UK's most complete GLP-1 guide
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- 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 Going Up In Price — What You Need to Know
Mounjaro (tirzepatide) costs in the UK are increasing, and understanding your access options is important if you're considering this prescription weight loss medication. Whether you're eligible for NHS specialist services or exploring private prescription routes, the cost and availability of Mounjaro vary significantly depending on how you access it. This guide explains the current UK pricing landscape, how to access Mounjaro affordably, and what factors affect the cost you'll pay.
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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.
UK Mounjaro Costs and Private Prescription Pricing
Private prescription costs for Mounjaro in the UK typically range from £129 to £320 per month, depending on the dose you're prescribed and the provider. Starting doses (2.5 mg) are usually at the lower end of this range, while higher maintenance doses (15 mg) cost significantly more. Prices have been rising gradually across most UK private providers as demand has increased and supply chain costs have changed. The dose titration schedule means you'll spend 4 weeks on each dose before escalating — so your first month cost may differ from your maintenance costs.
- 2.5 mg starting dose: typically £129–£150/month
- 5–7.5 mg mid-range doses: typically £160–£220/month
- 10–15 mg maintenance doses: typically £240–£320/month
These are approximate ranges; costs vary between GPhC-registered online prescribing services. Unlike traditional pharmacies, online prescription services typically include the consultation fee, prescription, and dispensing in one transparent price. Always check what's included before proceeding — some services charge consultation separately.
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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.
NHS vs Private Access: Understanding Your Options
NHS access to Mounjaro is free at the point of use, but availability is very limited. NICE (National Institute for Health and Care Excellence) has approved tirzepatide for use within NHS tier 3 specialist weight management services, but you'll need a GP referral and will face waiting lists that can stretch months to years depending on your region. NHS access typically requires BMI ≥30 or ≥27 with weight-related health conditions, and assessment by a specialist multidisciplinary team. Private prescription access is faster — you can have a consultation within days through an online prescriber — but you'll pay for the full cost yourself. Use our GLP-1 weight loss calculator to project potential outcomes, and our BMI calculator to check your eligibility before exploring either route.
- 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 is Mounjaro getting more expensive in the UK?
Mounjaro prices have risen due to increased demand, manufacturing costs, supply chain pressures, and the growing popularity of GLP-1 medications for weight management. As more people seek access, providers have adjusted pricing upward. This is typical for newer prescription medications as they become more widely used.
Is Mounjaro cheaper on the NHS than private prescription?
Yes — NHS access is free at the point of use once prescribed. However, NHS waiting lists are very long in most regions, sometimes 6–12+ months. Private prescription costs £129–£320/month depending on dose. For many people, the cost of private access is offset by quicker availability versus lengthy NHS waiting times.
Can I switch between NHS and private Mounjaro prescription?
Once you start private prescription, you'll typically continue privately unless you're referred to NHS specialist services through your GP. If you later access NHS services, you may need to restart the dose titration schedule. Always discuss with your prescriber before switching routes to avoid interruptions.
Does the Mounjaro KwikPen cost differ between NHS and private?
No — the actual KwikPen device and medication are the same. The difference is whether you're paying privately per pen (approximately one pen per month at starting doses) or receiving it free through the NHS. Each KwikPen contains 4 weekly doses.
Will Mounjaro prices continue to increase?
It's difficult to predict, but prices may stabilise as more competitors enter the market and generic tirzepatide becomes available in future years. For now, comparing providers and checking current costs is worthwhile if you're considering private prescription — costs do vary between services.
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.