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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Will Mounjaro Go Down In Price In The UK?
Mounjaro (tirzepatide) pricing in the UK is currently high, and whether prices will drop depends on several factors including patent protection, NHS commissioning, and generic alternatives. Right now, private prescriptions cost between £150–£320 per month depending on your dose, while NHS access through specialist services is free but availability is limited. This guide explains the factors affecting Mounjaro costs and what pricing trends might look like over time.
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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.
Factors That Could Affect Mounjaro Pricing
Patent protection is the main factor keeping Mounjaro prices high. Eli Lilly holds the patent for tirzepatide until approximately 2032, meaning no generic versions can be manufactured before then. Once patents expire, generic tirzepatide may become available at lower cost — similar to what happened with other medications after patent expiry.
NHS commissioning also influences UK pricing. NICE approved tirzepatide (Mounjaro) for weight management in specialist tier 3 services, but regional availability varies significantly. As demand increases and more NHS services commission it, bulk purchasing power may reduce costs, or conversely, supply pressures could maintain higher prices.
International pricing affects UK costs too. If tirzepatide becomes significantly cheaper in other countries, UK pricing may adjust to remain competitive. Currently, private Mounjaro KwikPen costs reflect the manufacturer's pricing strategy and pharmacist margins.
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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 Mounjaro Costs Today
On the NHS, Mounjaro is free once prescribed through a specialist weight management service — but access requires GP referral and specialist assessment, and waiting lists can be very long in many regions.
Through private prescribing, you pay per dose: typically £129–£320 monthly depending on whether you're on the starting dose (2.5 mg) or maximum dose (15 mg). Costs vary between providers. You'll also need an online clinical assessment, which is usually included in the consultation fee.
Use our free GLP-1 weight loss calculator to estimate projected weight loss at different Mounjaro doses, which can help you decide whether private treatment offers value for your situation.
If cost is a concern, discuss NHS referral with your GP — this is free but may involve waiting. Some private providers offer dose-stacking (building up slowly) which can reduce monthly costs initially. Generic tirzepatide is unlikely before 2032, but prices may gradually decrease as competition between private providers increases and NHS demand scales up.
- 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.
When will Mounjaro get cheaper in the UK?
Mounjaro is patent-protected until approximately 2032. Generic tirzepatide may become available after patent expiry, which could lower prices significantly. Private pricing may decrease gradually as provider competition increases, but NHS access remains free today — though availability is limited.
How much does Mounjaro cost privately right now?
Private Mounjaro costs £129–£320 per month depending on your dose and provider. Starting doses (2.5–5 mg) cost less; maximum dose (15 mg) costs more. Prices include the online clinical assessment and prescription.
Is Mounjaro cheaper on the NHS?
Yes — Mounjaro is completely free on the NHS once prescribed through a specialist tier 3 weight management service. However, access requires GP referral and specialist assessment. Waiting times for NHS services vary significantly by region.
Will Mounjaro prices drop when generics arrive?
Yes, likely significantly. When tirzepatide patents expire around 2032, generic versions will compete with the branded Mounjaro KwikPen. Historical precedent shows generic medications cost 80–90% less than branded versions.
How does Mounjaro pricing compare to Wegovy?
Both Mounjaro and Wegovy typically cost £129–£320 monthly through private prescribing, depending on dose. Mounjaro reaches a higher maximum dose (15 mg vs Wegovy's 2.4 mg), so pricing may differ based on your individual dose titration. Both are free via NHS specialist services where available.
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.