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 loss injection available in the UK through both NHS specialist services and private prescription routes. The cost varies significantly depending on whether you access it through the NHS or privately. This guide explains current UK pricing, how to get a prescription, and what factors affect availability. Use our free GLP-1 weight loss calculator to estimate potential outcomes at different doses before discussing Mounjaro with your prescriber.
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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.
UK Private Mounjaro Costs and Prescription Routes
Private prescription costs for Mounjaro in the UK typically range from £129 to £320 per month depending on your dose. A KwikPen device contains four weekly injections (one month's supply). Starting doses (2.5 mg) are usually at the lower end of this range, while higher maintenance doses (15 mg) are at the top. Costs may vary between GPhC-registered online pharmacies and private clinics. Private access does not require NHS referral — you can obtain a prescription following an online clinical assessment with a UK-licensed prescriber. Many people choose the private route to avoid NHS waiting lists, which in some regions can extend several months or longer. Some private providers offer dose escalation packages or subscription models that may affect overall cost.
- Starting dose (2.5 mg): typically £129–£160 per month
- Maintenance doses (5–10 mg): typically £160–£250 per month
- Maximum dose (15 mg): typically £280–£320 per month
- Private prescribers assess eligibility independently of NHS thresholds
- You'll need a clinical assessment, usually completed online within 24–48 hours
Clinically BackedWeight Loss
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.
NHS Access vs Private: How to Get Mounjaro
NHS access to Mounjaro is through tier 3 specialist weight management services, which requires a GP referral. NICE has approved tirzepatide as a GIP receptor agonist for NHS use, but availability is limited by regional funding and waiting lists. Many areas have waiting times of 6–18 months or longer. Private access is faster: you complete an online consultation with a licensed UK prescriber (usually within 24–48 hours), and if approved, your prescription is sent to a GPhC-registered pharmacy for dispensing. Private costs are out-of-pocket; the NHS does not reimburse private Mounjaro prescriptions. Track your progress alongside treatment using our free progress tracker to monitor weight loss outcomes and dose adjustments over time.
- 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.
Can I get Mounjaro on the NHS in the UK?
Yes, Mounjaro (tirzepatide) is approved by NICE for NHS use in specialist tier 3 weight management services. However, availability varies by region, and waiting lists can be very long (6–18 months in many areas). You'll need a GP referral. Many people choose private prescription to avoid NHS waiting times.
What is the typical cost of Mounjaro on prescription in the UK?
Private Mounjaro prescriptions in the UK typically cost £129–£320 per month depending on your dose. A KwikPen contains four weekly injections (one month's supply). Starting doses are cheaper; maximum dose (15 mg) is most expensive. Costs may vary between different private providers.
How quickly can I get a private Mounjaro prescription in the UK?
Private prescription timelines are much faster than NHS. Most online consultations with a UK-licensed prescriber are completed within 24–48 hours. If approved, your prescription is sent to a pharmacy and can be dispatched within 1–3 business days. Total time from consultation to first dose is typically 3–5 days.
Do I need a GP referral for private Mounjaro?
No. Private Mounjaro prescriptions do not require a GP referral. You can apply directly to a private prescriber online, complete a clinical assessment, and receive a prescription independently of NHS services. Your GP doesn't need to be involved unless you choose to inform them.
Is Mounjaro more expensive than Wegovy in the UK?
Costs are similar overall, though they vary by provider and dose. Mounjaro and Wegovy typically range £129–£320 per month privately in the UK. Exact pricing depends on the specific dose you're prescribed and which pharmacy or provider you use. Compare providers before committing.
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.