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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What's the cheapest way to get Mounjaro in the UK?
Mounjaro (tirzepatide) costs vary significantly in the UK depending on whether you access it through the NHS or private prescription. There is no single "cheapest" option because pricing depends on the dose, pharmacy, and your eligibility route. This guide explains UK Mounjaro costs, how to find affordable access, and what affects the price you'll pay for this prescription weight loss injection.
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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.
Understanding Mounjaro pricing in the UK
Mounjaro pricing in the UK ranges from approximately £130 to £320 per month, depending on the dose and provider. Starting doses (2.5 mg) are typically the cheapest, while the maximum dose (15 mg) costs the most. Each KwikPen contains four weekly injections, so pricing is quoted per pen or per month. Private online prescribing services often advertise competitive pricing, but costs vary between providers. Some offer tiered pricing based on dose, meaning you pay less initially and more as you titrate up. NHS access is free if prescribed through a specialist weight management service, but NHS availability is extremely limited and waiting lists can be 12–24+ months in many areas. Your total annual cost through private prescription could range from £1,560 to £3,840 depending on dose progression and provider.
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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.
How to access affordable Mounjaro
The most affordable option is NHS prescription if you're eligible, but this requires referral to a tier 3 specialist weight management service through your GP—availability varies dramatically by region (ICB). If NHS access isn't available in your area, private prescription through a UK-licensed online prescriber is the main alternative. Compare pricing across GPhC-registered pharmacies, as costs do vary. Some providers offer loyalty discounts or reduced prices for longer-term prescriptions. Starting on a lower dose (2.5 mg) costs less than jumping to higher doses, so budget for gradual titration. Use our free GLP-1 weight loss calculator to estimate your potential dose progression, which helps you forecast total costs.
- 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?
Mounjaro is free on the NHS if prescribed by a specialist weight management service, but NHS access is severely limited. You must be referred by your GP to a tier 3 service, and many areas have waiting lists exceeding 12–24 months. NICE has approved tirzepatide for use within NHS specialist services, but practical availability is extremely variable across the UK.
What's the average private prescription cost for Mounjaro in the UK?
Private Mounjaro costs typically range from £130–£320 per month depending on dose. Starting dose (2.5 mg) is cheapest; maximum dose (15 mg) is most expensive. A KwikPen contains four weekly injections. Annual costs through private prescription range from approximately £1,560–£3,840.
Why does Mounjaro cost more at some pharmacies than others?
Pricing varies because private pharmacies set their own rates. Factors include brand markup, service costs, clinical assessment fees, and competition. Comparing GPhC-registered providers can help you find more competitive pricing. Some offer bulk discounts or loyalty rates.
Should I start on a lower Mounjaro dose to save money?
Lower starting doses (2.5 mg) do cost less initially, but you'll still need to titrate up for effectiveness—typically reaching 10–15 mg over 16+ weeks. Budgeting for the full titration journey is more realistic than staying on starting doses long-term.
Can I get cheaper Mounjaro by using a different brand name or generic version?
Tirzepatide (the active ingredient in Mounjaro) is currently only available under the brand name Mounjaro in the UK. No generic tirzepatide is available yet. Generic versions may become available in future years, but pricing is currently set by Mounjaro availability only.
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.