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 in the UK — NHS Access and Costs
Mounjaro (tirzepatide) is a prescription-only weight management injection available in the UK through both NHS specialist services and private prescribing routes. Many people search for discounted or lower-cost options, but it's important to understand how pricing works, what NHS access looks like, and how to find safe, legitimate prescriptions. This guide explains your options for accessing Mounjaro affordably in the UK, eligibility criteria, and what to expect from each route.
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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.
How Mounjaro Pricing and NHS Access Works in the UK
NHS Route: Mounjaro is available through NHS specialist tier 3 weight management services, but access varies significantly by region. Your GP must refer you to your local integrated care board (ICB) specialist service. If approved, you receive Mounjaro free at point of use — no prescription charge applies. However, NHS waiting lists can be lengthy in many areas, sometimes stretching months or longer.
Private Route: Private prescribing offers faster access. Costs typically range from £129 to £320 per month depending on dose — with lower doses (2.5–5mg) costing less than maximum doses (10–15mg). The Mounjaro KwikPen contains 4 weekly doses, so monthly costs depend on your current dose during titration. Discounts may be available through some providers, particularly for upfront payment or longer courses.
- NHS: Free but potentially long waiting list
- Private: £129–£320/month depending on dose and provider
- Always use GPhC-registered pharmacies for private prescriptions
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 vs NHS — Which Route Suits You?
The NHS route is ideal if you can wait and want zero out-of-pocket cost. Referral starts with your GP — ask about your ICB's eligibility criteria and waiting times. The private route suits those who want faster access or don't meet NHS thresholds yet. To access private Mounjaro, you'll need an online consultation with a UK-licensed prescriber who will assess your eligibility based on your weight, BMI, and health context — similar to NHS assessment but faster.
Important: Never purchase Mounjaro without a valid UK prescription, and always use registered pharmacy services. "Discounted" Mounjaro from unregistered sources is unsafe and illegal. Your best value comes from legitimate providers, whether NHS or GPhC-registered private pharmacies.
- 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.
Can I get Mounjaro free on the NHS?
Yes, if prescribed through an NHS tier 3 specialist weight management service. Your GP must refer you to your local integrated care board. You'll pay no prescription charge, but waiting times vary by region — sometimes several months. Not all areas have equal access, and some services have strict eligibility criteria.
What's the typical cost of private Mounjaro in the UK?
Private Mounjaro costs between £129 and £320 per month in the UK, depending on your dose. Starting doses (2.5–5mg) are cheaper; maximum doses (15mg) cost more. Each KwikPen contains 4 weekly injections. Some providers offer discounts for payment upfront or ongoing treatment.
What's the difference between Mounjaro and Wegovy on the NHS?
Both tirzepatide (Mounjaro) and semaglutide (Wegovy) are NHS-approved for weight management, but availability and eligibility vary by ICB. Mounjaro is a dual GIP/GLP-1 agonist; Wegovy is GLP-1 only. Clinical trials showed Mounjaro resulted in slightly higher average weight loss, though results vary individually. Your prescriber will assess which suits you.
Is there a way to get Mounjaro more cheaply?
The NHS route is free if you qualify and can access tier 3 services. For private Mounjaro, compare GPhC-registered providers — some offer discounts for longer courses or direct payment. Never purchase from unregistered sources. Using our GLP-1 weight loss calculator can help you estimate potential outcomes before committing to treatment.
How do I check if I'm eligible for Mounjaro in the UK?
You're generally eligible if you have a BMI of 30 or above, or 27–29.9 with weight-related health conditions like type 2 diabetes or high blood pressure. South Asian, Chinese, Black African, and Black Caribbean adults may qualify at lower BMI thresholds. Use the free BMI calculator on this page to check your starting point, then discuss eligibility with your GP or a private prescriber.
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.