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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What Does Mounjaro Cost in the UK?
Mounjaro (tirzepatide) is available in the UK through both NHS specialist services and private prescription routes, with significantly different costs and access pathways. If you're considering this weight management option, understanding the pricing structure and eligibility requirements is essential. This guide explains what you can expect to pay, how the NHS route works, and what the private prescription process involves. Use our free BMI calculator above to check your eligibility based on current NHS guidelines before exploring your options.
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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.
Private Mounjaro Costs and Access in the UK
Private Mounjaro prescriptions in the UK typically cost between £129 and £320 per month, depending on the dose you're prescribed and the provider you choose. The initial Mounjaro KwikPen (containing 4 weeks of doses) is usually charged at the higher end, around £299–£320, with subsequent months potentially lower if you remain on the same dose. Once you reach a maintenance dose—most commonly 10mg or 15mg weekly—costs often stabilise.
To access Mounjaro privately, you'll need a consultation with a UK-licensed prescriber through a GPhC-registered online pharmacy. The prescriber will assess your eligibility based on your BMI, health history, and weight-related conditions. Unlike NHS access which requires a specialist referral, private routes allow you to start treatment without waiting for tier 3 weight management services. The full tirzepatide prescription and supply process—from consultation to delivery—typically takes 5–10 working days.
- Costs cover the consultation fee, prescription, and medication supply
- Most providers offer flexible dosing schedules aligned with SURMOUNT trial protocols
- Dose titration follows standard 4-week intervals from 2.5mg up to 15mg
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: How to Get Mounjaro
The NHS route requires a GP referral to a tier 3 specialist weight management service in your area. Once referred, you'll be clinically assessed by the multidisciplinary team, who may prescribe Mounjaro if you meet NICE approval criteria. NHS prescriptions are free, but waiting times vary dramatically by region—some areas have waiting lists of 12–24 months. Availability also depends on your Integrated Care Board's commissioning decisions.
The private route involves an online consultation with a UK-licensed prescriber, typically completing within 1–2 weeks. You'll need a valid NHS number and GP details. If approved, your prescription is sent to a GPhC-registered pharmacy for dispensing. Try our GLP-1 weight loss calculator to estimate potential outcomes at different doses, which can help inform your discussion with a prescriber about which dose and timeline suits your goals.
- 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 a single Mounjaro pen cost privately?
A single Mounjaro KwikPen (4 weeks supply) costs approximately £299–£320 when starting treatment privately. Subsequent months may be slightly cheaper once you're established on your maintenance dose, typically ranging from £129–£220 depending on dose and provider pricing. Always check with your chosen provider for their exact costs.
Is Mounjaro free on the NHS?
Yes, Mounjaro is free on the NHS if prescribed through a specialist tier 3 weight management service. However, you must meet NICE eligibility criteria and be referred by your GP. Access varies significantly by region, and waiting times can be very long—check with your local Integrated Care Board for availability and expected timescales in your area.
What is the difference between Mounjaro and Wegovy pricing?
Private Mounjaro typically costs £129–£320/month, while private Wegovy (semaglutide) is similarly priced at around £129–£280/month depending on dose. Mounjaro uses a dual GIP/GLP-1 mechanism and reaches a higher maximum dose (15mg vs 2.4mg), which may influence individual prescriber recommendations and pricing structures.
Do I need a GP referral for private Mounjaro?
No—private Mounjaro prescriptions do not require a GP referral. You can access a UK-licensed prescriber directly through an online consultation with a GPhC-registered pharmacy. However, you will need to provide your NHS number and GP contact details so the prescriber can access your medical history and inform your GP of the prescription.
What does the private prescription cost include?
The price typically includes the online consultation fee (often £20–£50), the prescription itself, and the medication supply. Some providers bundle these, others charge separately. Delivery is usually included, though express delivery may incur additional costs. Always confirm what's included in the stated price before committing to treatment.
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.