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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5mg Mounjaro Cost in the UK — Access & Pricing
If you're considering Mounjaro (tirzepatide) for weight management in the UK, understanding the costs and access routes is essential. The 5mg dose is a common maintenance or escalation dose during treatment. Costs vary significantly depending on whether you access Mounjaro through the NHS or private prescription. This guide explains what you can expect to pay, how to access Mounjaro, and the differences between NHS and private routes 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 Mounjaro costs in the UK typically range from £129 to £320 per month depending on the dose, provider, and whether you're accessing a 1-month or 4-week supply. The 5mg dose (a KwikPen containing four weekly injections) generally costs around £180 to £240 per month through GPhC-registered online pharmacies following a private online clinical assessment. Each KwikPen lasts four weeks and contains a single month's doses. Prices can vary between providers, so it's worth comparing costs across several registered services. Private prescription routes do not require an NHS referral and can be faster than waiting for NHS specialist services — though individual eligibility and suitability must be assessed by a UK-licensed prescriber during an online consultation. Many people using Mounjaro privately also use our GLP-1 weight loss calculator to project potential outcomes at different doses, which can help inform cost-benefit decisions.
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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 Access vs Private Prescription Routes
NHS access: Mounjaro is approved by NICE for use within NHS specialist weight management services (tier 3/4). However, NHS access is limited and typically requires referral from your GP to a specialist service. Regional availability varies significantly, with some areas having waiting lists of months or even years. Once approved, Mounjaro is provided at no cost through the NHS. Private access: Available through UK-licensed online prescribers without NHS referral. You complete an online consultation, and if clinically appropriate, you receive a prescription to be dispensed by a GPhC-registered pharmacy. Private costs apply, but access is faster. Both routes require clinical assessment to confirm eligibility based on BMI and health status — you can check your personal BMI using our free BMI calculator above to understand whether you may be eligible.
- 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 a 5mg Mounjaro KwikPen cost privately in the UK?
Private costs typically range from £180 to £240 per month for the 5mg dose through UK online pharmacies. Each KwikPen contains four weekly injections (one month's supply). Prices vary by provider, so comparing several services is recommended. Some providers offer subscription packages with slight discounts for regular orders.
Is Mounjaro available on the NHS in the UK?
Yes, Mounjaro is approved by NICE for NHS specialist weight management services. However, access is through referral to tier 3/4 services only — not standard GP prescription. Regional availability and waiting times vary significantly. Once approved, it is provided free through the NHS.
What is the difference between Mounjaro and Wegovy, and how do their costs compare?
Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist, while Wegovy (semaglutide) is a GLP-1 agonist only. Mounjaro's maximum dose is 15mg weekly versus Wegovy's 2.4mg. Private costs are similar (£129–£320/month), but individual clinical outcomes and suitability differ. Your GP or prescriber can advise which is appropriate for you.
How long does a 5mg Mounjaro KwikPen last?
Each 5mg KwikPen contains four pre-filled doses (one per week), lasting exactly four weeks. You would need one pen per month to maintain continuous treatment at 5mg, or you may escalate to higher doses after minimum four-week intervals on your prescriber's guidance.
Can I get Mounjaro through my GP without NHS specialist referral?
Not routinely. GPs can refer you to NHS specialist weight management services, but standard GP prescription of Mounjaro is not common. Private online prescribers can assess and prescribe Mounjaro without NHS referral if you meet clinical criteria. Ask your GP about local specialist services or explore private prescription options.
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.