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
Free tracker included with every download this week
How Much Does Mounjaro Cost in the UK?
Mounjaro (tirzepatide) is available in the UK through both NHS specialist services and private online prescribing, with costs varying significantly between the two routes. If you're considering this prescription weight loss injection, understanding the pricing and access pathways is essential. The cost depends on whether you access Mounjaro through the NHS or private healthcare, your dose level, and your region. This guide breaks down both options so you can make an informed decision about cost and accessibility.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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.
Private Mounjaro Cost and Access in the UK
Private prescription costs for Mounjaro in the UK typically range from £129 to £320 per month, depending on the dose prescribed. A standard KwikPen device contains four weekly injections (one month's supply). Starting doses (2.5 mg) are usually at the lower end of this range, whilst higher maintenance doses (10–15 mg) cost more.
- Starting dose (2.5 mg per week): approximately £129–£160 per month
- Mid-range doses (5–7.5 mg per week): approximately £180–£240 per month
- Higher doses (10–15 mg per week): approximately £240–£320 per month
Private access involves an online consultation with a UK-licensed prescriber, typically costing £20–£50 (though this is often waived if you proceed with a prescription). The prescription is then dispensed by a GPhC-registered online pharmacy. Private access does not require NHS referral, making it faster than the NHS route — you can usually receive your first prescription within 2–5 days of consultation.
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 Route for Mounjaro
NHS access to Mounjaro is free at the point of use (after standard prescription charge of £9.90 per item if eligible). However, NHS availability is limited and varies significantly by region. NICE approved tirzepatide (Mounjaro) for NHS use, but access is through specialist tier 3/4 weight management services, not routine GP prescription. You must be referred by your GP to a local NHS weight management service, and waiting lists can extend from several months to over a year in many areas.
Use our free BMI calculator to check your personal BMI and understand your eligibility starting point. When you access the NHS route, your prescriber can also discuss projected weight loss using clinical evidence — our GLP-1 weight loss calculator can help you explore potential outcomes at different doses.
- 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 in the UK?
Yes, Mounjaro (tirzepatide) is approved by NICE for NHS use in specialist weight management services (tier 3/4). However, availability is limited and varies by region (ICB). NHS access is free but requires GP referral and can involve waiting lists of several months to over a year.
How much does a private Mounjaro prescription cost per month?
Private Mounjaro costs typically range from £129–£320 per month depending on dose. Starting doses (2.5 mg) cost around £129–£160; mid-range doses (5–7.5 mg) around £180–£240; and higher doses (10–15 mg) around £240–£320. Each KwikPen contains four weekly injections.
What is included in the private Mounjaro cost?
Private costs cover the prescription fee (usually £20–£50 for online consultation, sometimes waived), the medication itself, and dispensing by a GPhC-registered pharmacy. Ongoing costs are per-prescription dose — you pay only for the dose your prescriber recommends, typically monthly.
How long does it take to get Mounjaro privately vs NHS?
Private access is faster — usually 2–5 days from consultation to first prescription. NHS access requires GP referral to a specialist weight management service and can involve waiting lists of 3–12+ months depending on your region.
Do I need a prescription to buy Mounjaro in the UK?
Yes, Mounjaro is prescription-only in the UK. Private access requires an online clinical assessment from a UK-licensed prescriber; NHS access requires GP referral to a specialist tier 3/4 service. No pharmacy can dispense Mounjaro without a valid prescription.
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.