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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Mounjaro 5mg Cost in the UK — NHS and Private Routes
Mounjaro 5mg is a prescription-only weight management injection containing tirzepatide, typically used as a maintenance dose after dose titration. The cost of Mounjaro in the UK varies significantly depending on whether you access it through the NHS or via private prescription. This guide explains NHS eligibility, how the NHS tier 3 specialist system works, and what private options cost, so you can understand the full picture of 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.
NHS Access and Eligibility for Mounjaro in the UK
NICE approval: Tirzepatide (Mounjaro) has been approved by NICE for use within NHS specialist weight management services. However, NHS availability is significantly limited and varies by region. Access is typically through tier 3 or tier 4 specialist weight management services, not standard GP prescription.
- You must be referred by your GP to a specialist service in your region
- Eligibility: BMI 30+, or BMI 27–29.9 with weight-related health conditions (type 2 diabetes, hypertension, sleep apnoea, cardiovascular disease)
- Lower thresholds apply for South Asian, Chinese, Black African, and Black Caribbean adults (BMI 27.5+)
- Waiting lists for NHS specialist services can be several months to over a year in many regions
- If approved through NHS, there is no prescription cost (subject to standard NHS prescription charges)
Check your local Integrated Care Board (ICB) website to find tier 3 weight management services in your area. Our BMI calculator can help you confirm whether you meet the initial eligibility criteria.
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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
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Private Mounjaro Access and Costs in the UK
Private prescription access is faster but involves direct costs. You can obtain Mounjaro through GPhC-registered online pharmacies following a clinical assessment with a UK-licensed prescriber. Costs typically range from £120–£300+ per month depending on your dose and the pharmacy provider.
- 5mg dose: usually £120–£180 per month (single KwikPen = 4-week supply)
- 10mg and higher doses: typically £200–£300+ per month
- No waiting list — usually dispensed within 1–2 weeks of approved prescription
- Clinical assessment required (online consultation) — similar to NHS assessment but faster
- You pay the full cost privately unless your private health insurance covers weight management medication
Our GLP-1 weight loss calculator can help you estimate projected weight loss outcomes at the 5mg dose to 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.
What is the difference between Mounjaro 5mg on the NHS and private?
NHS access is free (standard prescription charge applies) but requires specialist referral and may involve long waiting lists. Private access is faster (1–2 weeks) but costs £120–£180 monthly for 5mg. Both require prescription from a licensed UK prescriber following clinical assessment.
How much does Mounjaro 5mg cost privately in the UK?
Private Mounjaro 5mg typically costs £120–£180 per month through GPhC-registered pharmacies. Costs vary by provider and may be higher or lower depending on the specific service. This covers a 4-week supply (one KwikPen with four 5mg doses).
Can I get Mounjaro 5mg on the NHS without waiting?
No. NHS access is through tier 3 specialist weight management services, which usually have significant waiting lists. Private prescription is the fastest route, typically dispensed within 1–2 weeks of approved online consultation. Check your local ICB for NHS service availability.
Do I need a prescription to buy Mounjaro 5mg in the UK?
Yes. Mounjaro is prescription-only in the UK — you cannot buy it without a prescription from a licensed UK prescriber. You can obtain a prescription through NHS specialist services or private online consultation following clinical assessment.
Is Mounjaro 5mg the right dose for me?
Mounjaro 5mg is typically a starting or early adjustment dose during dose titration. Most users progress to higher doses (10mg, 15mg) based on response and tolerance. Your prescriber will assess which dose is appropriate for you during your clinical assessment. Use our BMI calculator to confirm eligibility first.
Ready to take control of your weight loss journey?
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