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 and private online prescribing. If you're looking for low-price Mounjaro access, it's important to understand how UK pricing works, where to get it, and what affects the cost. Prices vary significantly depending on your dose and which route you choose — NHS or private. This guide explains your options and what to expect when accessing this medication 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.
Private Mounjaro Costs in the UK
Private prescription Mounjaro costs in the UK typically range from £129 to £320 per month, depending on your dose and the prescribing provider. The starting dose (2.5 mg) is usually at the lower end of this range, while the maximum dose (15 mg) sits at the higher end. Each KwikPen contains 4 weeks' supply — one pen per dose level.
- 2.5 mg dose: approximately £129–£160 per month
- 5–10 mg doses: approximately £180–£240 per month
- 15 mg dose (maximum): approximately £280–£320 per month
These prices reflect the cost of the medication itself plus the online clinical assessment fee charged by GPhC-registered pharmacies. Prices vary between providers, so it's worth comparing. Many people access Mounjaro privately to avoid NHS waiting lists, which in some regions can extend many months. Your GP can advise whether private access is appropriate for your situation, though you don't need an NHS referral to pursue private prescribing.
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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.
NHS vs Private Access Routes
In the UK, Mounjaro is available through two main routes: NHS specialist weight management services (tier 3) and private online prescribing. NHS access is free at the point of use but typically requires a GP referral and assessment by a specialist weight management team — waiting times vary significantly by region, from weeks to over a year in some areas. Private access is faster: you complete an online clinical consultation with a UK-licensed prescriber, receive a prescription if approved, and collect from a GPhC-registered pharmacy. The private route requires you to pay for the medication and consultation, but there's no waiting list. Your GP can discuss which route suits your circumstances. Use our free GLP-1 weight loss calculator to explore potential outcomes before deciding on treatment, and our BMI calculator to confirm your eligibility baseline.
- 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.
What's the cheapest way to access Mounjaro in the UK?
Private online prescribing typically costs £129–£320/month depending on dose, with no waiting list. NHS access is free but involves waiting times that vary by region. Neither route assures "low price" Mounjaro — both have associated costs (either medication cost privately, or NHS waiting). Comparing both with your GP is wise.
Do prices vary between private providers for Mounjaro?
Yes, significantly. GPhC-registered pharmacies set their own pricing for the medication and consultation fees. Prices can differ by £30–£50 per month between providers for the same dose. Always ask about total costs upfront — including the clinical assessment fee — before proceeding.
Is Mounjaro cheaper than Wegovy in the UK?
Pricing is similar — both typically cost £129–£320/month privately, depending on dose. Wegovy's maximum dose (2.4 mg) is lower than Mounjaro's (15 mg), so direct dose-to-dose comparison is complex. Your prescriber will recommend the most appropriate option based on your health profile.
Can I get Mounjaro on the NHS without paying?
Yes, NHS access is free at point of use. However, you need a referral to a tier 3 specialist weight management service, and waiting times vary from weeks to over a year depending on your region and local service capacity. Ask your GP about NHS eligibility and estimated wait times in your area.
What's included in the price when I buy Mounjaro privately?
Private prices typically include the medication itself and the online clinical assessment by a UK-licensed prescriber. Some providers bundle ongoing support or follow-up consultations; others charge separately for these. Always clarify what's included before purchasing. You'll also need to check if repeat prescriptions incur additional consultation fees.
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.