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
Are Mounjaro Prices Going Down in the UK?
Mounjaro (tirzepatide) pricing in the UK is complex and varies significantly depending on whether you access it through the NHS or private prescribing. The short answer: private prices have fluctuated but show modest downward pressure as competition increases, whilst NHS availability remains limited and geographically inconsistent. This guide explains current UK costs, what affects pricing, and your access options.
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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.
Mounjaro Pricing in the UK Private Market
Private prescription costs for Mounjaro KwikPens in the UK typically range from £129 to £320 per month, depending on dose strength and the online prescriber or pharmacy. The 2.5 mg starting dose is usually at the lower end (around £129–£180), while the maximum 15 mg dose is at the higher end (around £250–£320). Several factors influence private pricing: dose titration schedules (you start low and increase weekly), competition between GPhC-registered online pharmacies, bulk purchasing agreements, and supplier costs. There is some evidence of price stabilisation and modest decreases in certain doses as more providers enter the market, though prices remain high compared to equivalent GLP-1 medications like Wegovy semaglutide. Private access does not require NHS referral—you can consult a UK-licensed prescriber online, receive a prescription if clinically appropriate, and have it dispensed by a regulated pharmacy.
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
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 Access and Regional Availability
Mounjaro has been approved by NICE (the National Institute for Health and Care Excellence) for use within NHS weight management services, but actual access remains extremely limited. Most regions have no current availability, and where NHS Mounjaro is prescribed, it is typically through specialist tier 3 or tier 4 weight management services following a GP referral. NHS prescriptions are free at point of use (you pay standard prescription fees), but waiting lists can extend many months or years. Regional variation is significant—some integrated care boards (ICBs) have begun pilot programmes while others have no access. If you meet NHS eligibility criteria (BMI ≥30, or ≥27 with weight-related health conditions), ask your GP about NHS referral options in your area, though be prepared for potential waiting times.
- 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 getting cheaper in the UK?
Private prices show modest stabilisation and occasional discounts as more online pharmacies enter the market, but remain expensive (typically £129–£320/month depending on dose). NHS prescriptions are free but availability is very limited. Prices are unlikely to drop dramatically unless tirzepatide licensing expands or manufacturing costs fall significantly.
Why is Mounjaro so expensive compared to other weight loss injections?
Mounjaro uses a dual GIP/GLP-1 mechanism (versus single GLP-1 in other medications), involves complex manufacturing by Eli Lilly, and demand currently exceeds supply in many markets. Patent protection also limits generic competition. As more competitors enter the market, prices may gradually decrease.
Can I get Mounjaro on the NHS in the UK?
NICE has approved tirzepatide for NHS use, but actual availability is extremely limited and varies by region. You would need GP referral to a specialist weight management service. Most areas have significant waiting lists. Contact your GP to check NHS access in your region.
What's the difference between private Mounjaro costs and Wegovy costs?
Mounjaro typically costs £129–£320/month depending on dose. Wegovy (semaglutide) costs range £129–£300/month depending on dose strength. Prices are broadly similar, though individual pharmacies and doses vary. Your GP or prescriber can advise which is most cost-effective for you.
Do I need to pay the full Mounjaro cost upfront when prescribed privately?
No—private online pharmacies typically charge per prescription (per four-week KwikPen supply). Most accept payment at point of prescription. Some offer subscription discounts if you commit to regular refills. Always check the pharmacy's payment terms before ordering.
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.