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
What Does Mounjaro Cost in the UK?
Mounjaro (tirzepatide) is a prescription-only 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 through the NHS or privately. Understanding your options, eligibility criteria, and what the GLP-1 receptor agonist injection involves will help you make an informed decision about this dual GIP receptor and GLP-1 receptor weight loss treatment. Our BMI calculator can help you check your starting point before exploring treatment options.
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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.
Mounjaro Cost Through Private Prescription in the UK
Private prescription costs for Mounjaro (tirzepatide) in the UK typically range from £150 to £320 per month, depending on the dose strength, provider, and whether additional consultations or monitoring are included.
- Starting dose (2.5 mg): approximately £150–£180 per month
- Standard dose (5–10 mg): approximately £180–£250 per month
- Higher dose (12.5–15 mg): approximately £250–£320 per month
Each KwikPen device contains four weekly injections (one month's supply). Private costs include the GP consultation (usually £25–£50), the clinical assessment by a registered prescriber, and the prescription fee. Most GPhC-registered online providers offer transparent pricing upfront. It's important to note that once on a stable dose, you may pay slightly less as consultations become less frequent. Always confirm the total cost including all consultations and monitoring before starting.
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 — How to Get Mounjaro
NHS access to Mounjaro is free at the point of prescription but only available through specialist tier 3 or tier 4 weight management services. This typically requires referral from your GP and involves waiting lists that can range from several months to over a year, depending on your regional integrated care board (ICB). Eligibility requires a BMI of 30 or above (or 27+ with weight-related health conditions such as type 2 diabetes or hypertension).
Private prescription is faster — you can access an online consultation with a UK-licensed prescriber within days. After a clinical assessment via video or online form, a prescription can be issued if appropriate. This route offers flexibility and avoids NHS waiting lists, but requires you to pay the full cost. Use our GLP-1 weight loss calculator to explore potential outcomes, and our BMI calculator to confirm your current status before exploring either route.
- 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 Mounjaro cost if I get it privately in the UK?
Private Mounjaro costs typically range from £150–£320 per month depending on your dose. Starting doses (2.5 mg) are at the lower end, around £150–£180/month, whilst higher doses (12.5–15 mg) may cost £250–£320/month. This usually includes the online consultation with a prescriber and the prescription itself. Always check what's included before paying.
Can I get Mounjaro free on the NHS in the UK?
Yes, Mounjaro is free on the NHS if prescribed through a specialist weight management service (tier 3 or 4). However, you need a GP referral and may face significant waiting lists (several months to over a year depending on your region). You must also meet eligibility criteria: BMI 30 or above, or 27+ with weight-related health conditions.
What's the difference between NHS and private Mounjaro?
The medication itself is identical. The difference is cost, waiting time, and access pathway. NHS is free but involves GP referral and waiting lists. Private is faster (days to weeks) but costs £150–£320/month. Both require a clinical assessment and prescription from a licensed healthcare professional.
Do I need a prescription for Mounjaro in the UK?
Yes, Mounjaro is a prescription-only medicine (POM) in the UK. You cannot buy it without a prescription from a UK-licensed doctor or prescriber. A clinical assessment is always required to confirm it's appropriate for your health status before a prescription is issued.
How often do I need to pay for Mounjaro?
Each Mounjaro KwikPen contains four weekly injections (one month's supply), so you pay monthly. If accessing privately, budget for ongoing monthly costs plus initial consultation fees. Some providers offer discounts for paying upfront for multiple months. Always factor in regular check-ins with your 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.