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 Comparison — Understanding UK Costs
Mounjaro (tirzepatide) pricing in the UK varies significantly depending on whether you access it through the NHS or private prescription routes. The cost per dose depends on which tirzepatide strength you're prescribed, ranging from the starting 2.5 mg dose to the maximum 15 mg weekly injection. Understanding these costs, how pricing works, and what affects the overall expense can help you make an informed decision about weight management treatment. This guide breaks down real UK pricing, explains the differences between routes, and helps you understand what to expect financially if you're considering this prescription medication.
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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 Costs
NHS costs: If prescribed through the NHS, Mounjaro is free at the point of use — you only pay the standard prescription charge (currently £9.65 in England) regardless of dose. However, NHS access is extremely limited. You must be referred to a specialist tier 3 or tier 4 weight management service by your GP, and many ICBs (integrated care boards) have long waiting lists or restricted eligibility criteria. Some regions may not fund Mounjaro at all yet, as NICE approval is recent.
Private prescription costs: Through private online prescribing services, Mounjaro costs typically range from £129 to £320 per month depending on your dose. Lower doses (2.5–5 mg) are usually cheaper (around £129–£179/month), while higher maintenance doses (10–15 mg) cost more (£240–£320/month). Each KwikPen contains 4 weekly injections (one month's supply), so the price quoted is per pen. Private services require an online clinical assessment from a UK-licensed prescriber before issuing a prescription.
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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.
What Affects Mounjaro Pricing
Several factors influence how much you'll pay for Mounjaro. Dose escalation: You start at 2.5 mg and typically increase every 4 weeks, so your monthly cost will gradually rise as your dose increases — you won't pay maximum price immediately. Provider variation: Different GPhC-registered online pharmacies set their own prices, so comparing a few providers can save £20–£50/month. Bulk purchasing: Some services offer small discounts if you commit to multiple months upfront. Pharmacy location: UK-based pharmacies must follow MHRA and GPhC standards, but minor pricing differences exist between providers.
- 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?
Mounjaro is free on the NHS (except the standard £9.65 prescription charge in England). However, NHS access is very limited — you need referral to a specialist weight management service, and many areas have waiting lists of months to years. Availability varies significantly by region and ICB funding decisions.
What's the typical private cost per month for Mounjaro?
Private Mounjaro typically costs £129–£180/month for lower doses (2.5–5 mg) and £240–£320/month for higher maintenance doses (10–15 mg). Each KwikPen is a 4-week supply. Prices vary between providers, so it's worth comparing. Always ensure you're using a GPhC-registered pharmacy.
Why does Mounjaro cost more at higher doses?
Higher doses contain more tirzepatide active ingredient, so they cost more to manufacture and supply. As you titrate up from 2.5 mg to your maintenance dose (usually 10–15 mg), your monthly cost increases. You're not paying maximum price from week one — costs rise gradually over several weeks.
Is Mounjaro cheaper than Wegovy in the UK?
Pricing is similar — both typically cost £129–£320/month depending on dose through private services. Wegovy maximum dose is 2.4 mg, while Mounjaro goes to 15 mg, so direct price comparison is complex. Use our free GLP-1 weight loss calculator to compare projected costs and potential outcomes between the two options.
Can I get a cheaper Mounjaro prescription online?
Compare prices between different GPhC-registered online pharmacies — you'll find variation of £20–£50/month. Some pharmacies offer slightly lower prices or bulk discounts for 3–6 month commitments. Always verify the pharmacy is registered with the GPhC before ordering, and ensure a UK-licensed prescriber conducts a clinical assessment.
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.