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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How Much Does Mounjaro Cost A Month In The UK?
Mounjaro (tirzepatide) costs vary significantly depending on whether you access it through the NHS or privately in the UK. Private prescriptions typically cost between £129 and £320 per month depending on your dose, whilst NHS access is free at the point of use but availability is extremely limited and regional. Understanding the pricing structure and access routes can help you make an informed decision about weight loss treatment. This guide explains current UK costs, dose-related pricing, and how to access Mounjaro affordably.
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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.
Mounjaro Pricing By Dose — Private UK Costs
Private Mounjaro pricing in the UK ranges from approximately £129 to £320 per month, depending on which dose you're prescribed and which provider dispenses it. Each Mounjaro KwikPen contains four weeks' supply of one dose — so you receive one pen per month.
- Starting doses (2.5mg): typically £129–£160 per month
- Mid-range doses (5mg–10mg): typically £180–£240 per month
- Higher doses (12.5mg–15mg): typically £260–£320 per month
Prices vary between private GPhC-registered pharmacies and prescribing services — it's worth comparing providers. Some services offer discount codes or bundle pricing if paying upfront for multiple months. Your prescriber will start you on the lowest dose and may increase every 4 weeks, so your monthly cost typically increases as you progress through the dose escalation schedule.
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 To Mounjaro In The UK
Mounjaro is free through the NHS if you're referred to a specialist tier 3 or tier 4 weight management service. However, NHS access is extremely limited — waiting lists can be months or even years in many areas, and availability depends entirely on your local Integrated Care Board (ICB).
To access Mounjaro through the NHS, your GP must refer you to a specialist weight management service. You cannot request it directly from your GP practice. NICE (National Institute for Health and Care Excellence) has approved tirzepatide for use within NHS specialist services, but actual prescribing varies dramatically by region. Check with your local ICB or ask your GP about current waiting times and eligibility in your area.
- 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 available on the NHS in the UK?
Yes, Mounjaro is NICE-approved for NHS specialist weight management services and is free at the point of use. However, availability is extremely limited and regional. You'll need a GP referral to a tier 3 specialist service. Waiting times vary from months to years depending on your location. Private access is quicker but costs £129–£320 per month depending on dose.
Why does Mounjaro cost more at higher doses?
Each Mounjaro KwikPen contains a single dose (2.5mg, 5mg, 10mg, 12.5mg, or 15mg) for four weeks. Higher concentrations of tirzepatide cost more to manufacture and supply. You'll typically start at 2.5mg and increase every 4 weeks, so your monthly cost increases as you progress through dose escalation until you reach your maintenance dose.
Can I get Mounjaro prescribed through my GP privately?
Your GP can issue a private prescription for Mounjaro if they're willing, though many won't due to liability concerns. Most private Mounjaro access is through online consultation services with UK-licensed prescribers, who assess you remotely and issue a prescription to a GPhC-registered pharmacy for dispensing. This costs £129–£320 per month depending on dose.
Is Mounjaro the same as Ozempic?
No. Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist — a different mechanism from Ozempic (semaglutide), which is a GLP-1 agonist only. Ozempic is licensed for type 2 diabetes, not weight loss in the UK. Wegovy is the licensed UK weight loss version of semaglutide. They're different medications with different costs and eligibility criteria.
Are there any payment plans or discounts available for Mounjaro?
Some private prescribing services and pharmacies offer payment plans, subscription discounts, or upfront purchase discounts. Prices vary between providers, so it's worth comparing. The NHS offers it free if you can access it through a specialist service, though waiting times may be long. Our free GLP-1 weight loss calculator can help you estimate costs at different doses.
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.