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) is a prescription-only weight loss injection available in the UK through both NHS specialist services and private online prescribing. Costs vary significantly depending on whether you access it through the NHS or privately, your dose, and your location. This guide breaks down UK pricing, explains the difference between NHS and private access, and helps you understand what to expect when seeking Mounjaro treatment in the UK.
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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.
Private Mounjaro Costs in the UK
Private prescription costs for Mounjaro vary between providers, typically ranging from £129 to £320 per month depending on your dose and supplier. A single KwikPen device contains four weeks' worth of injections (one dose per week).
- Starting doses (2.5 mg) are usually at the lower end of the price range, around £129–£180 per month
- Maintenance doses (5–10 mg) typically cost £180–£250 per month
- Higher doses (12.5–15 mg) may cost £250–£320 per month or higher
These prices are for the tirzepatide KwikPen injection itself and do not include the private online consultation fee, which is usually £30–£100 depending on the prescribing service. Prices vary between GPhC-registered pharmacies and online prescribing services, so it's worth comparing providers. Some services offer subscription models or multi-month discounts that can reduce the cost per month.
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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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NHS vs Private Access Routes
NHS access to Mounjaro is free at the point of use but available only through specialist tier 3 weight management services. You must be referred by your GP and meet NICE eligibility criteria (BMI ≥30, or ≥27.5 with weight-related health conditions). NHS waiting lists vary significantly by region — some areas have waiting times of 12–24 months or longer.
Private access does not require NHS referral. You complete an online consultation with a UK-licensed prescriber, and if suitable, receive a prescription dispensed by a GPhC-registered pharmacy. This route is faster but comes at a cost. Use our free GLP-1 weight loss calculator to estimate potential costs and outcomes at different doses, helping you decide whether private treatment suits your circumstances.
What affects Mounjaro pricing? Dose escalation means costs typically increase over 20 weeks as you move from 2.5 mg up to your maintenance dose (usually 10–15 mg). Supply availability also influences pricing — during high demand periods, some providers may have longer wait times or higher costs. Always check whether the quoted price includes just the medication or additional fees like repeat prescription charges or follow-up consultations. Compare at least two providers before committing, and ask about their refund or satisfaction policy in case the medication doesn't suit you.
- 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 on the NHS in the UK?
Mounjaro is free on the NHS if prescribed through a specialist weight management service. However, you must be referred by your GP and meet NICE eligibility criteria. NHS availability varies by region, and waiting lists can be very long — sometimes 12–24 months or more depending on your local integrated care board (ICB).
What's the typical private cost of Mounjaro per month in the UK?
Private Mounjaro costs typically range from £129 to £320 per month depending on dose. Starting doses (2.5 mg) are usually around £129–£180, while higher maintenance doses (12.5–15 mg) may cost £250–£320 or more. Add £30–£100 for the initial online consultation fee.
Why does Mounjaro cost more at higher doses?
Higher doses require more active ingredient, so pharmaceutical costs increase. Your dose will likely increase over 20 weeks during the titration phase as your prescriber adjusts it to find your optimal maintenance dose. This means your monthly costs will typically rise as you progress through treatment.
Can I get Mounjaro through the NHS without waiting months?
NHS access depends on your local area and availability within your integrated care board. Some regions offer shorter waiting times than others. If the NHS wait is too long, private prescribing is available immediately following an online clinical assessment. Our BMI calculator can help you confirm whether you meet NHS eligibility criteria.
Is Mounjaro the most expensive weight loss injection in the UK?
Mounjaro and Wegovy (semaglutide) have similar private costs, typically £129–£320 per month. Saxenda (liraglutide) is a daily injection rather than weekly, and pricing varies. Compare prices between suppliers, as costs differ between GPhC-registered pharmacies and online prescribing services. Your prescriber can advise which option suits you best.
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.