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 Injection Cost in the UK?
Mounjaro (tirzepatide) is a prescription-only weekly weight loss injection available in the UK through both NHS specialist services and private prescribing. The cost varies significantly depending on whether you access it through the NHS or privately, and which dose you're prescribed. This guide explains the pricing structure, what affects the cost, and how to access Mounjaro 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.
Mounjaro Costs: NHS vs Private Access
NHS access: Mounjaro is available through NHS specialist tier 3 weight management services, but availability varies significantly by region. If you qualify through your local Integrated Care Board (ICB), there is no direct cost to you — it's provided free on the NHS. However, NHS waiting lists can be very long in many areas, and access depends on meeting strict eligibility criteria including a BMI of 30 or above (or 27+ with weight-related health conditions).
Private prescribing: Through private online consultations with a UK-licensed prescriber and GPhC-registered pharmacy, Mounjaro typically costs between £180–£320 per month depending on your dose. Each KwikPen contains 4 weekly injections (one month's supply). Private access is faster — usually within days — but requires payment upfront. Prices vary between providers, so it's worth comparing.
Your GP can advise on NHS eligibility and waiting times for your local area, while private prescribing platforms provide immediate access following an online clinical assessment.
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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.
Free Weight Loss Tools & Guides
Everything you need to understand your weight, explore medication options, and track your progress — completely free.
Mounjaro Doses and Pricing Breakdown
Mounjaro comes in six doses: 2.5 mg, 5 mg, 7.5 mg, 10 mg, 12.5 mg, and 15 mg. You start at 2.5 mg and increase every 4 weeks until you reach an effective dose — typically 5–10 mg for most people. Each dose has a slightly different private price due to manufacturing costs. Lower starter doses (2.5–5 mg) typically cost £180–£200 per month, while higher doses (10–15 mg) range from £250–£320 per month. Your prescriber will recommend the dose that balances effectiveness with tolerability. Use our GLP-1 weight loss calculator to explore potential outcomes at different doses 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.
Is Mounjaro available on the NHS in the UK?
Yes, Mounjaro is available through NHS specialist weight management services (tier 3), but access varies by region and involves waiting lists that can be months or years long. Your GP can refer you to your local service to check eligibility and current waiting times. Private prescribing offers faster access but requires payment.
What does Mounjaro cost privately in the UK?
Private Mounjaro typically costs £180–£320 per month depending on your dose. Starter doses are lower cost, higher doses (10–15 mg) are more expensive. Prices vary between private prescribing platforms, so compare options. Each pen contains 4 weekly injections.
Are there cheaper alternatives to Mounjaro for weight loss?
Wegovy (semaglutide) is an alternative weekly weight loss injection, often similarly priced. Saxenda (liraglutide) is a daily injection that may be cheaper. Compare costs across providers and ask your prescriber about options suitable for your health profile and budget.
Does the cost include everything I need?
Private costs typically cover the medication and prescriber consultation. You may need to budget separately for GP follow-ups or private monitoring if required. Ask your provider exactly what's included before paying. NHS care includes full clinical support once you access the service.
How can I check if I qualify for NHS Mounjaro?
Contact your GP and ask about referral to your local tier 3 weight management service. Eligibility requires BMI 30+ (or 27+ with weight-related conditions like diabetes, high blood pressure, or sleep apnoea). Your GP will assess you and refer if appropriate — waiting lists vary by region.
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.