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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Mounjaro Prices in the UK — What You Need to Know
Mounjaro (tirzepatide) pricing in the UK varies significantly depending on whether you access it through the NHS or privately. If you're considering this Eli Lilly injection for weight management, understanding the cost and access routes is essential. This guide explains NHS eligibility, private costs, and how the KwikPen dose titration system affects pricing. Use our free GLP-1 weight loss calculator to estimate potential outcomes before discussing options with your GP or a licensed prescriber.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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.
NHS Access and Eligibility for Mounjaro in the UK
Mounjaro is available through the NHS via specialist tier 3 and tier 4 weight management services, but access is heavily restricted and varies by region. NICE has approved tirzepatide for use within NHS specialist services for adults with a BMI of 30 or above, or 27–29.9 with weight-related health conditions including type 2 diabetes, hypertension, or cardiovascular disease.
For South Asian, Chinese, Black African, or Black Caribbean adults, lower BMI thresholds apply (from BMI 27.5). However, waiting lists for NHS specialist services are extremely long in most areas — often 12–24 months or longer. You must be referred by your GP to a tier 3 weight management service; direct access is not available. If NHS access is offered, there is no direct patient cost, but availability depends entirely on your local Integrated Care Board (ICB) commissioning decisions.
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.
Private Mounjaro Pricing and Access in the UK
Private prescribing offers faster access without NHS waiting lists. Private Mounjaro costs typically range from £150–£320 per month depending on the dose (starting dose 2.5 mg is cheaper; maximum dose 15 mg is most expensive). Each KwikPen contains four weekly doses, so costs are per four-week supply. Private prescriptions require an online clinical assessment with a UK-licensed prescriber via a GPhC-registered pharmacy — no GP referral needed. Some private providers offer payment plans to spread costs. Check your eligibility using our BMI calculator, then compare private prescribers to find transparent pricing before committing.
- 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.
Does the NHS prescribe Mounjaro for weight loss?
Yes, the NHS prescribes Mounjaro (tirzepatide) through specialist tier 3 weight management services for eligible adults. However, availability is extremely limited, and most areas have very long waiting lists (often 12+ months). Your GP must refer you to a specialist service; you cannot access it directly.
How much does Mounjaro cost privately in the UK?
Private Mounjaro costs typically £150–£320 per month depending on your dose. Starting doses are cheaper; the maximum 15 mg dose is most expensive. Costs are per four-week supply (one KwikPen with four weekly injections). Prices vary between private prescribers, so compare before purchasing.
What is the difference between Mounjaro and Ozempic pricing?
Mounjaro (tirzepatide) and Ozempic (semaglutide) are different medications with separate pricing. Mounjaro is Eli Lilly's dual GIP/GLP-1 agonist; Ozempic is Novo Nordisk's GLP-1-only product. Private pricing differs, and NHS availability varies. Ask your prescriber which is suitable and cost-effective for you.
Can I get Mounjaro on the NHS without waiting?
No. NHS Mounjaro access requires referral to a specialist tier 3 weight management service, and most have long waiting lists. Private prescribing is the only way to avoid NHS waiting times. Your GP can advise you on both NHS and private options available locally.
Is Mounjaro cheaper than Wegovy in the UK?
Pricing is similar — both Mounjaro and Wegovy typically cost £150–£320 monthly privately, depending on dose. Mounjaro (tirzepatide) is a dual GIP/GLP-1 agonist; Wegovy (semaglutide) is GLP-1-only. Cost should not be the only factor — discuss which medication your prescriber recommends based on your health profile.
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.