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 Is Mounjaro Price Going Up in the UK?
Mounjaro prices have increased significantly across the UK private market since its weight management approval in 2023. Supply constraints, manufacturing demand, and currency fluctuations have all contributed to rising costs. Whether you're accessing tirzepatide through NHS specialist services or private prescribing, understanding the reasons behind these increases — and your options — matters. This guide explains what's driving UK Mounjaro pricing and how to access weight management support affordably.
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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 Driving Mounjaro Price Increases in the UK?
Global supply and demand pressures: Mounjaro (tirzepatide) has seen unprecedented demand worldwide since its approval for weight management. Eli Lilly's manufacturing capacity has struggled to keep pace, creating shortages and supplier constraints that directly impact UK pricing.
Currency and import costs: Mounjaro is manufactured globally and imported into the UK. Post-2020 currency volatility and increased logistics costs have raised the base cost of importing the medication.
Tier 3 NHS specialist service pressures: NHS weight management services (tier 3) have faced significant demand, with waiting lists extending months or years in many regions. This has shifted some patients toward private routes, increasing private market competition and pricing.
Manufacturing investment: Eli Lilly has announced major manufacturing expansions to meet demand. These capital costs are often reflected in higher wholesale prices, which pharmacies pass to consumers.
- Wholesale prices have increased 15–25% since 2023
- Retail prices vary by dose and private provider (typically £129–£320 monthly at maximum dose)
- NHS access remains free at point of use for eligible patients
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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 Access — How Pricing Affects Your Options
NHS route: If you're eligible for weight management services through your NHS tier 3 specialist service, Mounjaro (tirzepatide) is provided free of charge. However, NHS access is limited by regional availability and waiting lists can extend 6–12 months in many areas. You'll need a referral from your GP and assessment of eligibility against NICE guidance criteria.
Private route: Private prescribing allows access without NHS referral but requires payment. Rising costs mean private providers have increased prices alongside wholesale increases. Use our free GLP-1 weight loss calculator to compare potential outcomes at different doses, and discuss costs with your prescriber before starting treatment. Check eligibility criteria — you must meet BMI thresholds and have clinical assessment.
NHS route: If you're eligible for weight management services through your NHS tier 3 specialist service, Mounjaro (tirzepatide) is provided free of charge. However, NHS access is limited by regional availability and waiting lists can extend 6–12 months in many areas. You'll need a referral from your GP and assessment of eligibility against NICE guidance criteria.
Private route: Private prescribing allows access without NHS referral but requires payment. Rising costs mean private providers have increased prices alongside wholesale increases. Use our free GLP-1 weight loss calculator to compare potential outcomes at different doses, and discuss costs with your prescriber before starting treatment. Check eligibility criteria — you must meet BMI thresholds and have clinical assessment.
- 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.
Will Mounjaro prices continue to rise in 2025?
Price stabilisation is expected as Eli Lilly completes manufacturing expansions. However, short-term increases are likely to continue through 2025. NHS provision remains free. Private prices may gradually stabilise once supply catches up with demand.
Is there a cheaper alternative to Mounjaro in the UK?
Yes. Wegovy (semaglutide), another GLP-1 injection, is also available privately at similar costs. Saxenda (liraglutide) is a once-daily alternative, though less commonly prescribed. NICE-approved NHS access to any medication depends on your BMI, health conditions, and regional ICB funding.
How can I access Mounjaro through the NHS without waiting?
NHS wait times are unavoidable — tier 3 specialist services are the only NHS route. Private prescribing offers faster access but requires payment. Speak to your GP about your region's specialist weight management services and current waiting times.
Why is Mounjaro more expensive than similar weight loss injections?
Mounjaro (tirzepatide) is a dual GIP and GLP-1 agonist, making it mechanically different from single GLP-1 medications like Wegovy. It's newer, patent-protected, and manufactured by a single supplier globally, which limits pricing competition compared to more established medications.
Can I get Mounjaro on prescription through my GP?
In the UK, Mounjaro prescriptions for weight management come through NHS tier 3 specialist services (referral required) or private prescribers (online or in-person). Standard GP prescribing is not available — weight management medication requires specialist assessment and monitoring.
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.