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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Why Are Mounjaro Prices Going Up in the UK?
Mounjaro (tirzepatide) prices have risen significantly in the UK in recent months, reflecting supply pressures, manufacturing costs, and international market dynamics. If you're considering this prescription-only weight management injection or already using it, understanding the cost landscape and your NHS and private options is essential. This guide explains what's driving price increases and how to access affordable treatment through both NHS specialist services and private prescribing routes.
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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's Behind Mounjaro Price Increases?
Several factors explain recent Mounjaro price increases across the UK:
- Global demand surge: Mounjaro demand has exceeded supply worldwide, particularly as both tirzepatide for type 2 diabetes and weight management uses have expanded rapidly.
- Manufacturing capacity: Eli Lilly has invested heavily in increasing production, but supply constraints remain in 2024–2025.
- Currency fluctuations: The pound's value against the US dollar affects drug pricing in the UK.
- NHS commissioning pressures: Specialist services managing Mounjaro KwikPen prescriptions face increased costs, which may be passed to private users.
- Private sector competition: As more online prescribing services offer tirzepatide, competitive pricing initially stabilised costs, but manufacturer wholesale prices have now risen, reflected in private prescriptions.
Current private Mounjaro costs typically range from £150–£320 per month depending on dose and provider, up from approximately £129–£200 per month in 2023.
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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: Your Cost Options for Mounjaro
NHS route: If eligible, Mounjaro through tier 3 specialist weight management services is free at the point of use, though waiting lists can be 6–18 months depending on your integrated care board. NHS eligibility requires a BMI of 30 or above, or 27–29.9 with weight-related health conditions such as type 2 diabetes, high blood pressure, or sleep apnoea.
Private route: Online prescribing services offer faster access (often within days) but involve private cost. With Mounjaro dose titration starting at 2.5 mg and increasing to 15 mg over 20 weeks, you'll typically spend £600–£2,400 over a full titration course. Using our GLP-1 weight loss calculator can help you estimate total costs for your treatment journey. Compare providers carefully — prices and support vary significantly.
- 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 cost privately in the UK right now?
Private Mounjaro typically costs £150–£320 per month depending on the dose (2.5 mg to 15 mg) and prescribing provider. Starting doses are cheaper than maximum doses. Over a full 20-week titration course, expect to spend £600–£2,400 before reaching maintenance. Always check individual provider pricing as costs vary.
Why is Mounjaro more expensive than Wegovy?
Mounjaro (tirzepatide, dual GIP/GLP-1 agonist) and Wegovy (semaglutide, GLP-1 agonist only) have similar UK pricing, though Mounjaro may be slightly higher due to manufacturing complexity. The primary cost driver is the prescribing provider, not the drug mechanism. Mounjaro vs Wegovy pricing varies between services.
Can I get Mounjaro free on the NHS if prices keep rising?
Yes, if you meet NHS eligibility criteria (BMI ≥30, or ≥27 with weight-related conditions). Your GP can refer you to your local tier 3 specialist weight management service. However, NHS waiting lists remain very long in many areas. Discuss both NHS and private options with your GP.
Will Mounjaro prices come down?
It's uncertain. Prices may stabilise once Eli Lilly increases manufacturing capacity significantly, but global demand remains high. If you're considering treatment, comparing current costs across providers and exploring NHS eligibility now is practical.
Is Mounjaro still worth it at higher prices?
Clinical trials showed tirzepatide helps people lose an average of 15–21% of body weight alongside dietary and lifestyle changes. Whether higher cost represents value depends on your health needs, available alternatives, and personal circumstances. Discuss this with your GP or prescriber.
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.