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 — Cost Comparison Guide
Mounjaro (tirzepatide) is a prescription-only weight loss injection licensed in the UK, and pricing varies significantly depending on whether you access it through the NHS or privately. This guide explains actual Mounjaro costs at different doses, how NHS access works, what you'll pay through private prescribing, and factors that affect the total cost of your treatment. Understanding pricing helps you plan your weight management journey.
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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.
NHS vs Private Mounjaro Access — Cost Differences
NHS access: Mounjaro is available through the NHS, but only via specialist tier 3 or tier 4 weight management services — not standard GP prescriptions. Access and cost depend on your local Integrated Care Board (ICB). Some regions offer it free at point of use; others have restricted access or waiting lists of many months. You'll need referral from your GP to specialist services.
Private access: Through GPhC-registered online pharmacies, Mounjaro typically costs between £140–£320 per month depending on your dose level. A clinical assessment with a UK-licensed prescriber is required before dispensing. Private costs are entirely out-of-pocket — there's no NHS subsidy. Each dose lasts 4 weeks (one KwikPen with 4 injections).
Regional variation: NHS availability varies widely. Some areas prioritise Mounjaro; others primarily offer Wegovy or GLP-1 medications. Contact your local weight management service for specific access and timeline information.
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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.
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Mounjaro Dose-by-Dose Pricing — What Each Strength Costs
Private Mounjaro prices typically follow this structure (prices vary by provider and may change):
- 2.5 mg (starting dose): approximately £140–£160 per month
- 5 mg (first maintenance): approximately £160–£180 per month
- 7.5 mg to 15 mg (higher doses): approximately £200–£320 per month
Higher doses cost more because each KwikPen contains a higher concentration of tirzepatide. You'll typically spend 4–12 weeks at each dose level before escalating, so your monthly spend may increase gradually as you progress through the titration schedule. Use our GLP-1 weight loss calculator to project your potential outcomes at different doses.
- 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.
How much does Mounjaro cost in the UK privately?
Private Mounjaro costs typically range from £140–£320 per month depending on your dose level and provider. Starting doses (2.5–5 mg) are around £140–£180/month; higher doses (7.5–15 mg) cost £200–£320/month. Prices vary between GPhC-registered pharmacies, so it's worth comparing before committing.
Is Mounjaro free on the NHS in the UK?
Mounjaro is available on the NHS but only through specialist weight management services (tier 3/4), not standard GP prescription. You'll need referral from your GP. Whether you pay depends on your region — some ICBs offer it free at point of use; others have restricted access or long waiting lists. Contact your local weight management service for details.
Why does Mounjaro cost more than Wegovy?
Mounjaro (tirzepatide) is a dual GIP/GLP-1 agonist — it works differently from Wegovy (semaglutide), which is a GLP-1-only medication. Different manufacturing, different mechanism, and different licensing agreements affect pricing. Clinical trials suggest Mounjaro may produce slightly greater average weight loss, which may justify the cost difference for some people.
What's included in the Mounjaro price — injection pen cost or medication only?
The price you pay typically covers the KwikPen pre-filled injection device and four weeks' worth of tirzepatide. You don't pay separately for the device. Each pen is disposable and contains enough medication for four weekly injections. Repeat prescriptions follow the same pricing structure each month.
Are there ways to reduce the cost of Mounjaro in the UK?
Check NHS access first — if you qualify for specialist services in your region, you may get it free or at reduced cost. Some private providers offer package discounts for 3- or 6-month upfront payment. Compare prices across GPhC-registered pharmacies — pricing varies. Ask about patient assistance schemes when you apply. Always use a reputable registered provider.
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.