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 Prices Increase — What You Need to Know
Mounjaro (tirzepatide) pricing has been subject to change in the UK market, with costs varying between NHS and private prescription routes. Understanding your access options—whether through NHS specialist weight management services or private online prescribing—is essential for managing the financial side of weight loss treatment. This guide explains current UK pricing, eligibility, and how to find affordable options.
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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.
What Does Mounjaro Cost in the UK?
Private prescription costs for Mounjaro in the UK typically range from £129 to £320 per month, depending on your dose and the prescribing provider. Starting doses (2.5 mg and 5 mg) are generally at the lower end of this range, while maximum doses (12.5 mg and 15 mg) cost more. Each KwikPen contains four weekly injections, so monthly supply equates to one pen per dose level.
Pricing varies between different online prescription services, so it's worth comparing costs before committing. Some providers offer discount schemes for longer-term commitments. NHS access is free at the point of care, but availability is limited and typically only through tier 3 specialist weight management services in your region. Waiting times for NHS specialist services can be significant—often several months to over a year in many areas.
- Starting dose (2.5–5 mg): approximately £129–£180/month privately
- Mid-range dose (7.5–10 mg): approximately £180–£240/month privately
- Maximum dose (12.5–15 mg): approximately £240–£320/month privately
- NHS route: free, but limited availability and longer waiting times
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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
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NHS vs Private: How to Access Mounjaro in the UK
NHS access requires referral from your GP to a tier 3 specialist weight management service. NICE has approved tirzepatide for NHS use, but availability depends on your region and local integrated care board (ICB) funding decisions. Many areas have significant waiting lists.
Private access is faster: complete an online clinical assessment with a UK-licensed prescriber, receive a prescription if appropriate, and have medication dispensed by a GPhC-registered pharmacy—usually within 2–5 days. You'll need to meet eligibility criteria (BMI ≥30 or ≥27 with weight-related health conditions) and disclose relevant medical history. Try our GLP-1 weight loss calculator to estimate potential outcomes, and use the BMI calculator to confirm your eligibility before pursuing either route.
Mounjaro vs Wegovy cost comparison: Both are prescription-only once-weekly injections. Mounjaro and Wegovy pricing is similar in the UK private market (£129–£320/month), though Mounjaro may offer slightly higher average weight loss in clinical trials. The choice between them depends on individual suitability, which a prescriber will assess. Both require dose titration starting at lower doses, so initial costs are typically lower than maximum-dose prices. Check with your prescriber about cost-effectiveness based on your specific health profile.
- 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 have Mounjaro prices increased in the UK?
Pharmaceutical pricing fluctuates due to manufacturing costs, supply and demand, currency exchange rates, and company pricing strategies. Tirzepatide demand has increased significantly as awareness of GLP-1 weight loss injections has grown, which can affect availability and cost. Private providers set their own prices, so costs vary between prescribing services.
Is Mounjaro available through the NHS in the UK?
Yes, NICE approved tirzepatide (Mounjaro) for NHS use in specialist tier 3 weight management services. However, availability varies significantly by region, and many areas have lengthy waiting lists. Your GP can refer you to your local specialist service if you meet eligibility criteria.
How much does a month's supply of Mounjaro cost privately?
Private Mounjaro costs typically range from £129–£320 per month depending on your dose. Starting doses (2.5–5 mg) cost around £129–£180/month, while maximum doses (12.5–15 mg) cost £240–£320/month. Prices vary between online prescribing services.
Can I get Mounjaro for free on the NHS, and how long does it take?
Mounjaro is free through the NHS for eligible adults, but access requires referral to a specialist weight management service and can involve waiting several months or longer. Private online prescribing is faster (typically 2–5 days) but requires payment.
How does Mounjaro pricing compare to Wegovy in the UK?
Both Mounjaro and Wegovy cost similarly in the private UK market—approximately £129–£320 per month depending on dose. Mounjaro is a dual GIP+GLP-1 agonist, while Wegovy is a GLP-1 agonist only. A prescriber will help determine which is more suitable based on your individual health and eligibility.
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.