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
Mounjaro Injection Cost & Access in the UK
Mounjaro (tirzepatide) is a weekly 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 privately or through the NHS, and availability differs across regions. Understanding your options — including eligibility, pricing, and how to get a prescription — helps you make an informed decision about this GLP-1 receptor agonist treatment.
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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.
Private Mounjaro Cost in the UK
Private prescription pricing for Mounjaro typically ranges from £129 to £320 per month depending on the dose and provider. A standard KwikPen (4-week supply) at the 5mg starting dose costs approximately £129–£180, while the maximum 15mg dose may cost £250–£320 monthly. Prices vary because different GPhC-registered online pharmacies set their own costs — there is no fixed NHS price for private prescriptions. Private access is available without NHS referral; you complete an online clinical assessment with a UK-licensed prescriber who decides if Mounjaro is appropriate for you. This route offers faster access but requires you to cover the full cost. Many people choose private prescription because NHS waiting lists for specialist weight management services can be months or years in some areas.
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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 vs Private Access Routes
NHS access is free at point of use but limited. NICE has approved tirzepatide for NHS specialist tier 3 weight management services, meaning your GP can refer you to a specialist service in your area. However, availability varies significantly by region (ICB), and waiting lists can be very long. Private access is faster — you can start within days — but costs apply. Use our free GLP-1 weight loss calculator to explore potential outcomes, and our BMI calculator to confirm your eligibility (BMI ≥27 with health conditions, or ≥30). To access privately, you need a valid UK prescription from a licensed prescriber following an online consultation assessment.
- 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 Mounjaro KwikPen cost in the UK?
Private Mounjaro costs approximately £129–£320 per month depending on dose. Each KwikPen contains 4 weekly injections (4-week supply). Starting doses (2.5–5mg) cost around £129–£180, while maintenance doses (10–15mg) cost £200–£320. NHS access is free but subject to specialist referral and regional availability.
Can I get Mounjaro free on the NHS?
Yes, Mounjaro is available free through NHS specialist weight management services (tier 3). Your GP must refer you to your local service. However, NHS availability varies by region and waiting lists can be several months to over a year in some areas, which is why many people choose private prescription access.
What is the online consultation process for private Mounjaro?
You complete a confidential online health questionnaire with a UK-licensed prescriber who reviews your medical history, BMI, and weight-related conditions. If approved, a prescription is issued and dispensed by a GPhC-registered pharmacy. The entire process typically takes 24–48 hours. You'll need to confirm eligibility (BMI ≥27 with conditions, or ≥30) and declare any contraindications.
Is Mounjaro cheaper than Wegovy in the UK?
Costs are similar — both typically range £129–£320 monthly depending on dose and provider. Mounjaro is a dual GIP and GLP-1 receptor agonist, while Wegovy is GLP-1 only. Clinical trial data suggests Mounjaro may produce slightly higher average weight loss (15–21% vs 15%), but individual results vary significantly and prescriber availability may differ.
What happens if I can't afford private Mounjaro?
Request an NHS referral from your GP to a specialist weight management service in your area. This is free but may involve a waiting list. Alternatively, discuss payment options with private providers — some offer payment plans or reduced starter packages. Your GP can also explore other evidence-based weight management support at tier 1 or 2 NHS services.
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.