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 available in the UK through both NHS specialist services and private prescription routes, though costs and access differ significantly. If you're considering this prescription-only injection for weight management, understanding your options — and what it actually costs — is essential. This guide explains UK pricing, how to access Mounjaro, and what to expect at each step.
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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.
Mounjaro Pricing: NHS vs Private Access
NHS access: Mounjaro is approved by NICE for use within NHS specialist tier 3 weight management services. However, NHS availability is free at point of care but access is limited and varies by region. Most people access Mounjaro through NHS specialist services after GP referral, with no direct prescription cost — though waiting lists can extend several months in many areas.
Private prescription costs: Through private online prescribing, Mounjaro typically costs between £129 and £320 per month depending on dose. Starting doses (2.5 mg) are usually at the lower end of this range; higher doses (10–15 mg) cost more. Costs typically include the consultation fee and prescription, dispensed by a GPhC-registered pharmacy. Some providers offer tiered pricing or dose-based discounts.
- Starter dose (2.5 mg): approximately £129–£160/month
- Maintenance doses (5–10 mg): approximately £180–£250/month
- Higher doses (15 mg): approximately £280–£320/month
Prices vary between providers — comparing options is worthwhile.
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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 Mounjaro in the UK: The Two Routes
NHS route: Ask your GP about referral to your local tier 3 weight management service. Eligibility requires BMI ≥30 (or ≥27.5 with weight-related health conditions). Referral leads to specialist assessment; if approved, Mounjaro is prescribed at no cost but involves clinic attendances.
Private route: Complete an online health questionnaire with a UK-licensed prescriber. If approved, a prescription is issued and dispensed by a GPhC-registered pharmacy for home delivery. This typically takes 2–5 working days from consultation. Private access does not require NHS referral or waiting lists, but you pay per dose. Use our GLP-1 weight loss calculator to estimate projected outcomes at different doses to help inform your decision.
- 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.
Is Mounjaro available on the NHS for weight loss?
Yes, Mounjaro (tirzepatide) is approved by NICE for NHS use within specialist tier 3 weight management services. However, availability varies significantly by region, and waiting lists can be long. Access requires GP referral and assessment. Once prescribed on the NHS, there is no prescription cost.
How much does Mounjaro cost privately in the UK?
Private Mounjaro costs typically range from £129 to £320 per month depending on dose. Starting doses (2.5 mg) are usually £129–£160/month, while higher maintenance doses (10–15 mg) cost £250–£320/month. Prices vary between providers — it's worth comparing options.
Can I get Mounjaro without an NHS referral?
Yes. Private prescribing allows you to access Mounjaro without NHS referral. You complete an online health assessment with a UK-licensed prescriber. If approved, a prescription is issued and dispensed by a pharmacy for home delivery. This avoids NHS waiting lists but involves private costs.
What is the difference between Mounjaro and a KwikPen?
Mounjaro is the medication (tirzepatide). A KwikPen is the delivery device — a pre-filled injection pen containing Mounjaro. Each KwikPen holds four weekly doses. The KwikPen is how Mounjaro is administered; they are part of the same product.
How long does it take to get Mounjaro through private prescription?
After your online consultation, if approved, a prescription is typically issued the same day or next working day. Dispensing and delivery usually take 2–5 working days. Total time from initial consultation to first injection is usually 5–10 working days.
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.