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 Price Comparison in the UK
If you're considering Mounjaro (tirzepatide) for weight management in the UK, understanding the cost differences between NHS and private routes is essential. Mounjaro pricing varies significantly depending on whether you access it through the NHS or a private prescriber. This guide explains what affects the price, where you can get it, and what to expect from a financial perspective.
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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 vs Private Pricing for Mounjaro in the UK
NHS Access: Mounjaro is available through NHS specialist tier 3 weight management services, but access is limited and varies by region. Where available, the NHS covers the cost of the medication itself, though you'll pay standard prescription charges (currently £9.65 per item in England if eligible). However, NHS availability is extremely restricted, and waiting lists in many areas exceed 6–12 months or longer.
Private Access: Through private prescribers and GPhC-registered pharmacies, Mounjaro typically costs between £140–£320 per month depending on your dose. A 4-week KwikPen supply at the starting dose (2.5 mg) costs around £140–£160, while the maximum dose (15 mg) may cost £250–£320. Private costs include the prescription assessment fee (usually £40–£100) plus the medication cost.
- Starting doses (2.5–5 mg): approximately £140–£180/month privately
- Mid-range doses (7.5–10 mg): approximately £180–£240/month privately
- Maximum dose (15 mg): approximately £250–£320/month privately
The mounjaro kwikpen pen device itself is included in these prices and contains 4 weeks of doses at your current prescription strength.
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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 Cost and Your Access Route
Several factors determine whether you can access Mounjaro on the NHS or must use private prescribing. NHS eligibility requires referral to a tier 3 specialist weight management service through your GP, but these services have extremely limited capacity and long waiting lists. Regional variation means some ICBs (Integrated Care Boards) offer Mounjaro through the NHS whilst others do not.
For weight loss injection uk access, most people turn to private online prescribing, where eligibility is assessed against NICE criteria (BMI 30+, or 27+ with weight-related health conditions). Your current dose also affects monthly cost — the higher your dose titration level, the more expensive the medication. Use our free BMI calculator to check whether you may meet eligibility criteria for prescription weight loss treatment. When comparing Mounjaro costs with alternatives, our GLP-1 weight loss calculator can help project potential results and costs at different dose levels.
- 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?
If available through your local NHS tier 3 weight management service, the medication is free, though you'll pay a standard prescription charge of £9.65 per item (England) if not exempt. However, NHS access is extremely limited and varies by region — many areas have no availability or very long waiting lists.
Is Mounjaro cheaper on the NHS or through a private prescriber?
The medication itself is free on the NHS but access is severely restricted. Private prescribing costs £140–£320/month depending on dose but is immediately accessible without waiting lists. Private is more expensive upfront but available now, whereas NHS may involve months of waiting for no assures of access.
What's included in the private Mounjaro cost?
Private costs typically include the online consultation/assessment fee (£40–£100), the prescription itself, and the medication (KwikPen). Total monthly cost for medication ranges from £140–£320 depending on your current dose. Some providers bundle these; others charge separately.
How does tirzepatide UK pricing compare to Wegovy?
Mounjaro (tirzepatide) and Wegovy (semaglutide) have similar monthly costs in the UK, typically £140–£300 privately. Mounjaro may offer slightly better value at higher doses due to its dual GIP/GLP-1 mechanism, but individual pricing varies by provider. Consult your prescriber for specific cost comparisons.
Why does Mounjaro cost more at higher doses?
Each KwikPen contains four weekly doses at a fixed strength. As you titrate up through dose escalation, you move to a higher-strength pen, which costs more to manufacture and supply. Staying at a lower dose (5 mg) costs less monthly than the maximum dose (15 mg).
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.