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 Cost and Access in the UK
Mounjaro (tirzepatide) is a prescription-only weight loss injection available through both NHS specialist services and private prescribing in the UK. However, access and cost vary significantly depending on which route you choose. Understanding your options — including NHS eligibility, waiting times, and private costs — helps you decide the right pathway for your situation. This guide covers current UK pricing, how to access Mounjaro, and what the clinical assessment process involves.
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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 Cost in the UK
Private Mounjaro costs in the UK typically range from £129 to £320 per month, depending on your dose and the prescribing provider. Starting doses (2.5 mg) are usually at the lower end, while maintenance doses like 10 mg or 15 mg cost more. Each KwikPen device contains four weekly injections, so monthly costs reflect your specific dose. Prices can vary between GPhC-registered online pharmacies, so comparing options is worth doing. Some private providers offer tirzepatide as a lower-cost alternative to branded Mounjaro, which may be slightly cheaper. Private access does not require an NHS referral — you can book an online consultation with a licensed prescriber, and if approved following clinical assessment, your prescription is dispensed by a registered pharmacy. This route typically takes days to a week, making it faster than NHS pathways in many areas.
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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 vs Private Access and How to Get Mounjaro
NHS access requires referral to a tier 3 or tier 4 specialist weight management service through your GP. NICE has approved tirzepatide for NHS use, but availability varies by region (Integrated Care Board) and demand often creates waiting lists of several months to years. If you do not wish to wait for the NHS, or your region has no immediate specialist availability, private prescribing offers faster access. Private access involves a consultation with a UK-licensed prescriber (usually online), who assesses your medical history, BMI, and weight-related health conditions. If suitable, they issue a prescription to a GPhC-registered pharmacy. You'll need to provide honest health information and confirm you meet eligibility criteria (BMI 30+ or 27+ with weight-related conditions). Use our free GLP-1 weight loss calculator to understand potential outcomes and our BMI calculator to check your eligibility baseline.
- 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, NICE has approved tirzepatide (Mounjaro) for use on the NHS through specialist tier 3 and tier 4 weight management services. However, access is restricted to these services and requires a GP referral. Availability varies significantly by region, and many areas have long waiting lists.
How much does Mounjaro cost privately per month?
Private Mounjaro typically costs £129–£320 per month in the UK, depending on your dose. Lower starting doses (2.5 mg) cost less, while higher maintenance doses (15 mg) cost more. Costs can vary between providers, so compare options before choosing.
How do I get a private Mounjaro prescription in the UK?
Book an online consultation with a UK-licensed prescriber through a GPhC-registered provider. Provide your medical history and weight information. If approved following clinical assessment, the prescriber issues a prescription to a registered pharmacy, which dispenses your medication.
How long does it take to get Mounjaro privately vs NHS?
Private prescribing typically takes 3–7 days from consultation to receiving your first injection. NHS access requires a GP referral and specialist assessment, which can take months to years depending on waiting lists and regional availability.
What eligibility criteria must I meet to access Mounjaro?
You must have a BMI of 30 kg/m² or above, or 27–29.9 with at least one weight-related health condition (type 2 diabetes, high blood pressure, cardiovascular disease, or sleep apnoea). South Asian and Black African backgrounds may have lower thresholds. A prescriber will assess your individual suitability.
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.