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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How to Get Mounjaro Affordably in the UK
If you're looking to get Mounjaro cheap in the UK, your options depend on whether you access it through the NHS or privately. Mounjaro (tirzepatide) is a prescription-only weight management injection licensed in the UK, but costs and availability vary significantly. Understanding your eligibility and the different routes available can help you find the most affordable option for your circumstances. This guide explains NHS access, private costs, and how to start the process.
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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.
NHS Access to Mounjaro — Eligibility and Tier 3 Services
NHS Mounjaro is available through specialist tier 3 weight management services, which means it's typically free at the point of use if you qualify and are accepted into your local service. However, NHS availability is extremely limited and varies significantly by region.
You may be eligible for NHS Mounjaro if you:
- Have a BMI of 30 kg/m² or above, or 27–29.9 kg/m² with weight-related health conditions (type 2 diabetes, hypertension, sleep apnoea, cardiovascular disease)
- Have been assessed and referred to a tier 3 specialist weight management service by your GP
- Are in a region where tirzepatide is currently funded
Many areas have waiting lists of 12–24+ months. Access through the NHS is the cheapest option if available, but availability is not assured. Your GP can assess your eligibility and discuss local options. NICE has approved tirzepatide for NHS use, but regional ICB (Integrated Care Board) funding decisions vary. Using our free BMI calculator above can help confirm whether you meet the BMI threshold to discuss with your GP.
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.
Private Mounjaro vs NHS — Cost, Speed, and Access
Private prescription routes offer faster access but with costs. You can obtain a Mounjaro KwikPen prescription through a UK-licensed prescriber via an online clinical assessment with GPhC-registered pharmacies. Typical costs range from £129–£280 per month depending on your dose and provider. The dose titration schedule means you start at 2.5 mg (lowest cost) and increase weekly, so your first month is cheapest. Compare this to NHS waiting times of many months — private access is faster but not free.
To minimise costs privately: Start with your GP first — they can refer you to NHS services at no cost. If NHS waiting lists are too long, ask your GP whether they can recommend a private prescriber or weight management clinic. Some private weight management services offer structured programmes at lower cost than direct pharmacy prices. Always ensure any prescriber is UK-licensed and any pharmacy is GPhC-registered.
Mounjaro vs Wegovy cost considerations: Mounjaro and Wegovy are both GLP-1-based injections (Mounjaro is dual GIP + GLP-1). Private costs are similar. Wegovy may have slightly more third-party discount codes available, but neither is typically cheaper than the other privately. NHS availability also varies between regions for both medications. The best strategy is to start with your GP, understand your local tier 3 services, and then explore private options if NHS waiting times are prohibitive. Track your progress using our free progress tracker to monitor whether treatment is working for you once you start.
- 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 free on the NHS in the UK?
Mounjaro is free at the point of use if prescribed through NHS tier 3 specialist weight management services, but availability is very limited and regional. Many areas have long waiting lists (12–24+ months). NICE has approved tirzepatide for NHS use, but individual ICB funding varies. Your GP can check whether your area offers NHS Mounjaro and refer you if eligible.
How much does Mounjaro cost privately in the UK?
Private Mounjaro costs typically range from £129–£280 per month depending on dose and provider. Your first month at 2.5 mg starting dose is cheapest. Costs increase as you titrate up to maintenance doses. This is significantly more expensive than NHS access but available without waiting lists.
What's the cheapest way to get Mounjaro in the UK?
The cheapest way is through NHS tier 3 services (free if eligible), but this requires GP referral and may involve waiting. If NHS waiting times are very long, private prescription is the faster alternative, though at cost. Always ask your GP about NHS options first before exploring private routes.
Do I need to go private for Mounjaro if my GP won't prescribe it?
GPs do not typically prescribe Mounjaro — it's a tier 3 specialist medication. You must be referred to a specialist weight management service. If your GP won't refer you, ask them to explain why. If you're eligible but facing long NHS waits, private prescribers can assess you independently.
Is Mounjaro cheaper than Wegovy privately?
Costs are broadly similar — both typically £129–£280 monthly depending on dose. Wegovy may occasionally have slightly more discount codes available, but pricing is comparable. NHS availability also varies regionally for both. Compare options with your GP or prescriber based on your individual eligibility and local 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.