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 Get Cheaper in the UK?
Mounjaro (tirzepatide) pricing in the UK depends on how you access it — through the NHS or privately. Currently, private costs range from around £150–£300 per month depending on dose. Whether Mounjaro will get cheaper depends on NHS expansion, patent timelines, and generic availability. Here's what affects pricing and what the future may hold for affordability of this weight management injection.
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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.
Current Mounjaro Pricing in the UK
NHS access: Mounjaro is now approved by NICE for use within NHS specialist tier 3 weight management services, but availability varies significantly by region. Where available through the NHS, there is no cost to patients. However, waiting lists can be lengthy in many areas, and not all ICBs (Integrated Care Boards) have commissioned the service yet.
Private access: Through GPhC-registered online prescribing services, Mounjaro costs typically range from £150–£320 per month depending on your dose. The starting dose (2.5 mg) is usually cheaper than higher maintenance doses (10 mg, 15 mg). Each KwikPen contains four weekly injections. Some providers offer dose-based pricing; others charge per pen.
- 2.5 mg starting dose: approximately £150–£180/month
- 5–7.5 mg maintenance dose: approximately £180–£240/month
- 10–15 mg higher doses: approximately £250–£320/month
Prices vary between providers and may change. Always compare costs across regulated services before purchasing.
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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.
Will Mounjaro Become Cheaper Over Time?
Several factors could lower Mounjaro costs in future:
- Generic competition: Tirzepatide's patent expires in 2033 in most territories. Once generic versions become available after patent expiry, prices typically fall significantly — potentially by 50–80%.
- NHS expansion: As more ICBs commission Mounjaro through specialist services, NHS access will improve, eliminating private costs for eligible patients.
- Biosimilar development: Biosimilar versions of tirzepatide may launch before full patent expiry, introducing price competition.
- Increased demand: Manufacturing scale and market competition among providers may gradually reduce private pricing.
However, prescription-only status means prices will remain regulated and likely higher than over-the-counter products. Check with your GP about NHS eligibility first — it remains the most affordable route where available.
- 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 cheaper on the NHS than privately?
Yes. Through NHS specialist weight management services, Mounjaro is free at point of use (no prescription cost). Private prescriptions cost £150–£320/month depending on dose. However, NHS availability varies by region and waiting times can be long. Check with your GP whether your local ICB offers Mounjaro through specialist services.
Why does Mounjaro cost so much?
Tirzepatide (Mounjaro) is an expensive medication to manufacture — it's a complex peptide. Eli Lilly holds the patent until 2033, meaning no generic competition currently exists. Regulatory approval, clinical trials, and ongoing safety monitoring also add to costs. Patent protection allows pharmaceutical companies to set higher prices.
Will Mounjaro get cheaper when the patent expires?
Yes, likely significantly. Tirzepatide's patent expires in 2033. Once generic or biosimilar versions can be manufactured and approved, prices typically drop by 50–80% within a few years. This is what happened with other medications after patent expiry. However, 2033 is still several years away.
Can I get Mounjaro on the NHS for weight loss?
Yes, if eligible. NICE has approved tirzepatide for NHS specialist tier 3 weight management services. You need a BMI of 30+ (or 27+ with weight-related health conditions) and referral from your GP. Availability and waiting times vary by region. Ask your GP about your local NHS options first.
What's the difference between Mounjaro and Wegovy pricing in the UK?
Both are similarly priced privately (£150–£320/month) depending on dose. Mounjaro and Wegovy are different medications — tirzepatide vs semaglutide respectively — and work slightly differently. Both are available through NHS specialist services where commissioned. Your prescriber will assess which is most appropriate for you. ```
Ready to take control of your weight loss journey?
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