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 15mg Price in the UK
The cost of Mounjaro 15mg in the UK varies significantly depending on whether you access it through the NHS or privately. The maximum dose of tirzepatide is prescribed by specialist weight management services or private prescribers following clinical assessment. This guide explains pricing, eligibility, and how to access Mounjaro in the UK, helping you understand the financial and health factors involved in this prescription-only weight management treatment.
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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.
NHS Access and Costs for Mounjaro
Mounjaro (tirzepatide) is available through NHS specialist tier 3 and tier 4 weight management services for eligible adults. The NHS does not charge for prescription medications once you have been prescribed them — you pay the standard prescription charge (currently £9.90 per item in England for adults, though some groups are exempt). This means accessing Mounjaro 15mg through the NHS costs only the flat prescription charge, not the drug cost itself.
However, NHS access involves significant practical considerations. You must be referred to a specialist weight management service by your GP, which requires meeting eligibility criteria: a BMI of 30 kg/m² or above, or BMI of 27–29.9 kg/m² with weight-related health conditions such as type 2 diabetes, high blood pressure, or cardiovascular disease. Regional availability varies greatly — some NHS areas have lengthy waiting lists (months to years in some regions), whilst others have limited services. Access also depends on your integrated care board (ICB) commissioning these services.
- Standard prescription charge applies in England (£9.90 per item)
- Referral through your GP required
- Assessment by specialist tier 3 service needed
- Regional waiting lists and availability vary
- Eligibility criteria must be met
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 Prescription Costs and Alternatives
Private access to Mounjaro 15mg is available through UK-licensed online prescribers and GPhC-registered pharmacies without requiring an NHS referral. Private costs typically range from £250–£400 per month depending on the dose (15mg is the maximum maintenance dose) and provider. A single Mounjaro KwikPen contains four weekly doses, so monthly cost reflects one pen supply. Private prescribers conduct online clinical assessments to determine suitability, and treatment is dispensed directly by regulated pharmacies.
Private access advantages include no NHS waiting lists and faster treatment initiation. However, costs are entirely out-of-pocket. Some private providers offer discount packages or subscription models. Importantly, tirzepatide (Mounjaro) requires dose titration starting at 2.5mg and escalating weekly, meaning lower costs initially. Use our free GLP-1 weight loss calculator to estimate potential outcomes at different doses, and our BMI calculator to check your starting point before pursuing any route.
Private access to Mounjaro 15mg is available through UK-licensed online prescribers and GPhC-registered pharmacies without requiring an NHS referral. Private costs typically range from £250–£400 per month depending on the dose (15mg is the maximum maintenance dose) and provider. A single Mounjaro KwikPen contains four weekly doses, so monthly cost reflects one pen supply. Private prescribers conduct online clinical assessments to determine suitability, and treatment is dispensed directly by regulated pharmacies.
Compared to Mounjaro, Wegovy (semaglutide) is another GLP-1 injection available privately at similar price points. The choice between them depends on clinical suitability and individual response — your prescriber will assess which is appropriate for you. Private access advantages include no NHS waiting lists and faster treatment initiation. However, costs are entirely out-of-pocket. Some private providers offer discount packages. Since tirzepatide requires dose titration starting at 2.5mg and escalating weekly, initial costs are lower. Use our free GLP-1 weight loss calculator to estimate potential outcomes at different doses, and our BMI calculator to check your baseline before pursuing 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.
Is Mounjaro 15mg free on the NHS?
Mounjaro is free on the NHS through specialist weight management services — you only pay the standard prescription charge (£9.90 per item in England). However, NHS access requires GP referral, eligibility assessment, and availability varies significantly by region. Many areas have substantial waiting lists.
How much does Mounjaro 15mg cost privately in the UK?
Private Mounjaro 15mg typically costs £250–£400 per month through online prescribers and regulated pharmacies. Cost varies by provider and may be lower on subscription plans. Remember you start at 2.5mg and titrate up, so initial costs are lower than the maximum dose price.
What's the difference between NHS and private Mounjaro access?
NHS access is cheaper but requires referral, assessment, and may involve waiting lists. Private access is faster, no waiting lists, but costs are out-of-pocket. Both routes require clinical assessment to confirm suitability based on your health and eligibility.
Can I switch between NHS and private Mounjaro treatment?
In theory yes, but switching requires clinical assessment each time. If you start privately then move to NHS, your GP would need to refer you to specialist services. Continuity of care may be easier if you stay on one route once established.
How does Mounjaro 15mg pricing compare to Wegovy?
Both typically cost £250–£400 monthly privately in the UK. NHS pricing is identical (standard prescription charge). The choice depends on which medication your prescriber recommends based on your health profile — both are GLP-1 based but Mounjaro adds a GIP component, requiring different dose escalation schedules.
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.