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 UK Price Comparison: NHS and Private Options
If you're considering Mounjaro (tirzepatide) for weight management in the UK, cost is often a key question. Access and pricing differ significantly depending on whether you pursue NHS or private prescription routes. This guide explains the realistic costs, eligibility pathways, and what you can expect to pay for this weight loss injection across the UK. Understanding your options helps you make an informed decision about whether Mounjaro is right for you.
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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: Availability and Eligibility
NHS access to Mounjaro is through specialist tier 3 and tier 4 weight management services only — not routine GP prescription. NICE has approved tirzepatide (Mounjaro) for use within NHS weight management pathways, but availability varies significantly by region and Integrated Care Board (ICB).
- Eligibility criteria: BMI of 30 or above, or 27–29.9 with weight-related health conditions (type 2 diabetes, high blood pressure, sleep apnoea, cardiovascular disease)
- South Asian, Black African, Caribbean, and Chinese adults: Lower thresholds may apply (eligibility may start at BMI 27.5)
- Access route: Referral from your GP to your local specialist weight management service
- Cost to you: Free at point of use (funded by NHS)
- Waiting times: Highly variable — many areas have significant waiting lists (3–18 months depending on region)
The KwikPen device is dispensed by the NHS at the appropriate dose escalation stage, with clinical monitoring included throughout your treatment.
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 Prescription: Costs and Access in the UK
Private Mounjaro prescription is available through GPhC-registered online pharmacies following a consultation with a UK-licensed prescriber. This route does not require NHS referral and typically offers faster access than NHS services.
- Typical costs (starting dose, 2.5 mg): £129–£180 for a 4-week supply
- Typical costs (maintenance doses, 10–15 mg): £240–£320 for a 4-week supply
- Consultation fee: Usually £30–£50 (sometimes included in first prescription)
- Access timeline: Often same-day or next-day consultation, prescription within 24–48 hours
- Dose escalation: Managed by your prescriber; minimum 4 weeks between dose increases
Private providers often offer flexible payment plans and may honour NHS dose escalation protocols for clinical safety.
- 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 free on the NHS in 2024?
Yes, NICE has approved tirzepatide (Mounjaro) for NHS use within specialist tier 3 weight management services. However, availability varies significantly by region — some areas have long waiting lists whilst others may not yet have established pathways. Your GP can advise whether your local ICB is offering NHS Mounjaro and what the waiting time is likely to be.
What is the difference between NHS and private Mounjaro prescription?
NHS Mounjaro is free but accessed through specialist weight management services with variable waiting times. Private Mounjaro requires online consultation and costs £129–£320 per month depending on dose. Private access is typically faster (24–48 hours) and does not require NHS referral. Both require clinical assessment and prescription from a licensed healthcare professional.
How much does Mounjaro cost privately in the UK?
Private Mounjaro costs range from approximately £129–£180 per month for starting doses (2.5 mg) to £240–£320 per month for maintenance doses (10–15 mg). Prices vary between providers and may include or exclude consultation fees. Many providers offer payment plans. Always confirm total costs upfront before starting treatment.
How long is the NHS waiting list for Mounjaro?
NHS waiting times for Mounjaro vary significantly by region and ICB. Some areas have waiting lists of 3–6 months, whilst others may exceed 12–18 months depending on service capacity and referral volume. Contact your local specialist weight management service directly for your region's current waiting time, or ask your GP for the most up-to-date information.
Do I need a prescription for Mounjaro in the UK?
Yes, Mounjaro is a prescription-only medicine in the UK. You cannot buy it over the counter. You must obtain a prescription from either the NHS (through a specialist weight management service) or a private UK-licensed prescriber following a clinical assessment. The prescription is then dispensed by a UK pharmacy.
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.