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
Mounjaro Weight Loss Cost in the UK
Mounjaro (tirzepatide) is a prescription-only, once-weekly weight loss injection licensed in the UK, but the cost varies significantly depending on whether you access it through the NHS or privately. If you're considering this dual GIP and GLP-1 receptor agonist, understanding the financial landscape is essential. This guide covers NHS eligibility, private pricing, dose costs, and what to expect when budgeting for treatment. Use our free GLP-1 weight loss calculator to explore potential outcomes at different doses alongside cost information.
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 vs Private Mounjaro Cost in the UK
NHS access: Mounjaro is available through specialist tier 3 and tier 4 NHS weight management services following NICE approval, meaning there is no direct cost to patients when prescribed through the NHS. However, NHS availability varies significantly by region and integrated care board (ICB), and waiting lists can be lengthy — some areas have waits of several months to years. You typically need a GP referral to specialist services and must meet specific BMI and health criteria.
Private access: Private prescriptions range from approximately £129 to £320 per month depending on your dose level. A single Mounjaro KwikPen contains 4 weekly doses (one month's supply). Private prescriptions are issued following an online clinical assessment with a UK-licensed prescriber through a GPhC-registered pharmacy — no NHS referral required. Private access is faster, typically available within days to weeks.
Dose and cost relationship: Starting doses (2.5 mg) are typically at the lower end of the private pricing range, while higher maintenance doses (10–15 mg) cost more. Most users spend 4 weeks on each dose before titrating up, so budget planning should account for escalating costs over the first 4–5 months of treatment.
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.
What Affects Your Mounjaro Cost?
Several factors influence Mounjaro pricing: dose level is the primary cost driver — starting at 2.5 mg and potentially reaching 15 mg over several months; provider choice — private prescribing services vary in pricing; frequency of purchases — some people buy a single month's supply, others purchase longer blocks at discounted rates; and NHS vs private pathway — which determines whether you pay anything at all. Additionally, if you're taking other medications or have health conditions requiring monitoring, GP appointments may incur costs in private services. Calculate your potential weight loss outcomes using our GLP-1 weight loss calculator, then discuss realistic timelines and costs with your prescriber before starting treatment.
- 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 cover Mounjaro for weight loss in the UK?
Yes, Mounjaro is available through NHS specialist weight management services (tier 3 and tier 4) following NICE approval. There is no direct cost to patients when prescribed through the NHS, but availability varies by region and waiting lists can be very long. You need a GP referral and must meet specific BMI criteria. Private access is faster but costs approximately £129–£320 per month depending on dose.
Why is Mounjaro more expensive at higher doses?
Each KwikPen contains a fixed dose (2.5 mg, 5 mg, 7.5 mg, 10 mg, 12.5 mg, or 15 mg). You start at 2.5 mg and increase every 4 weeks, so higher doses require different pens with higher manufacturing and supply costs. Maximum dose is 15 mg weekly. Private providers typically charge more for higher-dose pens.
How long does a Mounjaro KwikPen last?
Each KwikPen contains 4 weekly doses, so one pen lasts exactly 4 weeks. You'll need a new pen every month. Starting dose of 2.5 mg will cost less than a 15 mg pen at higher maintenance levels, so your monthly cost will increase as you titrate up during the first few months of treatment.
Can I get Mounjaro free through my GP?
Only if you're referred to and accepted by an NHS specialist weight management service in your area. Standard GP prescriptions do not cover Mounjaro for weight loss. You must be assessed as meeting BMI criteria (typically BMI ≥30, or ≥27 with weight-related health conditions) and referred to tier 3 services. NHS waiting lists vary by region.
Is Mounjaro cheaper than Wegovy in the UK?
Pricing between Mounjaro and Wegovy through private providers is generally similar, ranging £129–£320 monthly depending on dose level. Clinical trials showed Mounjaro (dual GIP/GLP-1 mechanism) achieved slightly higher average weight loss (~21% body weight) than semaglutide Wegovy (~15%), though individual results vary. Your prescriber can advise which is appropriate for you.
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.