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 Best Prices in the UK: NHS and Private Options
Mounjaro (tirzepatide) pricing in the UK varies significantly depending on whether you access it through the NHS or privately. This guide explains current Mounjaro costs, how NHS pricing works through specialist services, and what to expect with private prescriptions. Understanding your options helps you make an informed decision about weight loss 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.
NHS Access to Mounjaro: Eligibility and Pricing
The NHS provides Mounjaro through specialist tier 3 and tier 4 weight management services, meaning there is no direct cost to you at the point of prescribing if you are eligible and receive treatment through your local integrated care board (ICB). However, NHS access requires meeting specific eligibility criteria and being referred by your GP to a specialist weight management service.
- You must have a BMI of 30 kg/m² or above, or 27–29.9 kg/m² with weight-related health conditions such as type 2 diabetes, hypertension, or cardiovascular disease
- For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, lower BMI thresholds (27.5+) may apply due to higher health risks at lower weights
- You will need a GP referral and clinical assessment by specialist services
- Availability and waiting times vary significantly by region — some areas have waiting lists of many months
Once prescribed through the NHS, Mounjaro is dispensed at no cost (standard prescription charge applies in England: £9.90 per item, or free if you qualify for exemptions).
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 Prescriptions: Costs and Access
Private prescription costs for Mounjaro range from approximately £130–£320 per month depending on dose and provider, making it significantly more expensive than NHS access but immediately available without waiting lists. Private access requires an online consultation with a UK-licensed prescriber, who will assess your suitability before issuing a prescription.
- Starting dose (2.5 mg): typically £130–£170 per month
- Mid-range doses (5–10 mg): typically £200–£270 per month
- Higher doses (12.5–15 mg): typically £280–£320 per month
- Each KwikPen contains 4 weekly doses (1 month supply)
- Dispensed by a GPhC-registered pharmacy following your prescription
Use our free GLP-1 weight loss calculator to explore projected outcomes at different doses, and our BMI calculator to check your starting eligibility criteria.
- 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?
If you are prescribed Mounjaro through an NHS specialist weight management service and meet eligibility criteria, it is free at point of prescribing. However, NHS access requires a GP referral and assessment by specialist services, with significant regional variation in availability and waiting times.
How much does Mounjaro cost privately in the UK?
Private Mounjaro costs range from approximately £130–£320 per month depending on dose, with starting doses around £130–£170 and higher doses (12.5–15 mg) around £280–£320. This includes the KwikPen prescription dispensed by a UK pharmacy.
What's the difference between NHS and private Mounjaro in the UK?
NHS Mounjaro is free if you qualify and are referred to specialist services, but involves waiting lists and regional variation. Private Mounjaro is immediately available at cost (£130–£320/month), requiring only an online consultation with a UK-licensed prescriber. Both require clinical assessment before prescribing.
Do I need a prescription for Mounjaro in the UK?
Yes, Mounjaro is prescription-only in the UK. You cannot purchase it without a prescription from a UK-licensed prescriber. This applies whether you access it through the NHS or privately — both routes require clinical assessment.
How long does it take to get Mounjaro on the NHS?
NHS waiting times vary significantly by region. Some specialist weight management services have waiting lists of several months. Private prescriptions are typically processed within 24–48 hours of online consultation approval, making private access faster if cost is not a barrier.
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.