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
Free tracker included with every download this week
Will Mounjaro Come Down In Price?
Mounjaro (tirzepatide) prices in the UK are unlikely to drop significantly in the short term, but understanding the factors that influence cost can help you plan. Currently, private prescription costs range from around £150–£250 per month depending on dose and provider. NHS access through specialist weight management services is free but involves waiting lists. This guide explains what affects Mounjaro pricing in the UK and your treatment options.
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Calculate Your BMI Instantly
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 Affects Mounjaro Pricing in the UK?
Several factors influence Mounjaro costs. Eli Lilly, the manufacturer, sets the wholesale price for the UK market. The KwikPen device (containing four weekly doses) is priced per dose tier — higher doses cost more. Private online prescribers add their own consultation and dispensing fees, which vary significantly between providers. Currently, a 2.5 mg dose costs around £130–£150, while 15 mg doses reach £250–£320 per month. NHS access is free but requires referral to tier 3 specialist weight management services, though waiting times can be substantial. Generic alternatives (like tirzepatide from other manufacturers) may eventually enter the UK market after Eli Lilly's patent protection expires, which could reduce prices — but this is likely years away. Our GLP-1 weight loss calculator can help you estimate potential costs at different doses.
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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.
When Might UK Mounjaro Prices Fall?
Price reductions typically occur when generic competition enters the market — this happens after patent expiry. Eli Lilly's tirzepatide patents extend into the 2030s in most jurisdictions, so significant price drops are unlikely before then. Increasing competition between private prescribers may cause modest price variations year-on-year. NHS prices are negotiated nationally and tend to remain stable once approved. If you're considering Mounjaro, use our free BMI calculator to check your eligibility now — waiting for price drops could delay treatment. Your GP can also discuss NHS options, which carry no direct cost to you if you qualify for specialist services.
- 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 private prescription?
Yes — NHS Mounjaro is free for eligible patients, but access requires specialist tier 3 referral from your GP and can involve waiting lists of months. Private prescription costs £130–£320/month depending on dose, but you don't need an NHS referral.
Why does Mounjaro cost more than Wegovy in some clinics?
Mounjaro and Wegovy are different medications — tirzepatide (Mounjaro) is a dual GIP/GLP-1 agonist, while semaglutide (Wegovy) is a GLP-1 agonist only. Dosing schedules differ, and clinic pricing varies. Direct price comparison depends on the specific dose and provider.
Can I get Mounjaro cheaper by switching providers?
Yes — private online clinic prices for Mounjaro vary between £130–£320/month for the same dose. Shopping around and comparing consultation fees can save you money. Always ensure the provider is GPhC-registered and requires a proper clinical assessment.
Will Mounjaro become cheaper when generic tirzepatide is available?
Possibly, but likely not for several years. Eli Lilly holds patent protection on tirzepatide into the 2030s. Once patents expire, generic versions may enter the market and prices could fall — but this is typical for prescription medications and cannot be assured.
What should I do if Mounjaro costs are too high?
Discuss NHS options with your GP — referral to a specialist weight management service may grant you free access if you meet eligibility criteria (BMI ≥30, or ≥27 with weight-related health conditions). Alternatively, ask your prescriber about alternative GLP-1 medications like Wegovy or Saxenda, which may have different pricing structures.
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.