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 in the UK?
Mounjaro (tirzepatide) is a prescription-only weight management injection available in the UK through NHS specialist services or private prescribers. The cost varies significantly depending on whether you access it through the NHS or privately. Understanding UK pricing, eligibility criteria, and access routes will help you make an informed decision about whether this medication is right for you.
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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 Pricing — NHS vs Private Access
NHS access: Mounjaro is available through NHS specialist weight management services, typically at tier 3 or tier 4 clinics. If prescribed through the NHS, there is no direct medication cost — you pay only the standard prescription charge (currently £9.90 per prescription in England, though some patients qualify for exemptions). However, NHS availability is extremely limited and varies significantly by region. Waiting lists in many ICBs (Integrated Care Boards) can stretch several months to over a year. Not all regions currently offer tirzepatide through NHS services.
Private prescribing: Through private GPhC-registered online prescribers, Mounjaro typically costs between £130–£320 per month depending on your dose. The KwikPen contains 4 weekly injections. Costs generally increase with higher doses (from 2.5 mg through to 15 mg). Private prescribers do not require an NHS referral, making this route faster for many patients, though the cost is your responsibility. Some private providers offer discount packages for bulk orders or multi-month supplies.
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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.
What Affects Mounjaro Pricing?
Several factors influence how much you pay for Mounjaro. Your current dose matters most — starting doses (2.5 mg) cost less than maintenance doses (10–15 mg). Your dose increases over time — you'll typically start at 2.5 mg and escalate every 4 weeks, so your monthly cost will likely rise as you progress through the titration schedule. Private provider variation — different pharmacies charge different prices for the same dose, so it's worth comparing. Payment plans — some private providers offer payment plans or monthly subscriptions that may work out cheaper than one-off purchases. Calculate your potential weight loss and associated costs using our GLP-1 weight loss calculator, which can help you project expenses based on a typical dose schedule.
NHS Eligibility vs Private RequirementsTo access Mounjaro through the NHS, you must be referred to a specialist weight management service by your GP and meet NICE eligibility criteria — typically a BMI of 30 or above, or 27–29.9 with weight-related health conditions. South Asian, Chinese, Black African, or Black Caribbean adults may have access at lower BMI thresholds. NHS waiting lists are long and access varies by region. For private prescribing, you need only complete an online clinical assessment with a UK-licensed prescriber. A prescriber will assess your medical history, BMI, and health status. Use our free BMI calculator above to check whether you may be eligible, then discuss your options with a healthcare professional or private prescriber.
- 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 cheaper on the NHS or privately in the UK?
Through the NHS, Mounjaro costs only the standard prescription charge (£9.90 per prescription in England), but availability is extremely limited and waiting lists can be very long. Privately, Mounjaro typically costs £130–£320 per month depending on dose. Private access is faster but costs are your responsibility.
How much does a Mounjaro KwikPen cost?
A single KwikPen (containing 4 weekly injections) costs approximately £130–£320 depending on the dose strength and private provider. Prices vary between different GPhC-registered pharmacies, so comparing options is worthwhile.
Does the dose affect how much Mounjaro costs?
Yes, significantly. Lower starting doses (2.5 mg) cost less than higher maintenance doses (10–15 mg). As you progress through dose titration, your monthly cost will typically increase. Your prescriber will discuss dose progression and costs with you.
Can I get Mounjaro free on the NHS in the UK?
Yes, if prescribed through NHS specialist weight management services, you pay only the standard prescription charge. However, NHS access is very limited and regional availability varies. Your GP can refer you to a local specialist tier 3 service if available in your area.
What's the difference between Mounjaro cost and Wegovy cost in the UK?
Both typically cost £130–£320 per month privately, though exact pricing varies by provider and dose. Mounjaro has a higher maximum dose (15 mg vs Wegovy's 2.4 mg) and different titration schedule, which may affect your overall costs. Compare both options with a prescriber.
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.