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 Are the Best Mounjaro Prices in the UK?
Mounjaro (tirzepatide) is a prescription-only weight management injection available in the UK through both NHS specialist services and private online prescribing. The cost varies significantly depending on which route you choose and which dose you're prescribed. Understanding your options — whether NHS access or private treatment — helps you find the right solution for your circumstances. This guide explains how much Mounjaro costs and how to access it in the UK.
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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 Prices and Online Access Routes
Private online prescribing is currently the most accessible route for many UK adults. A Mounjaro KwikPen (4 weeks supply of once-weekly injections) typically costs between £129 and £320 per month depending on your dose, with prices varying across different GPhC-registered online pharmacies. Starting doses like 2.5 mg are usually at the lower end of this range, while higher maintenance doses (10 mg to 15 mg) cost more. You'll also pay for an online consultation with a UK-licensed prescriber (typically £20–£60), and they'll assess whether Mounjaro is suitable for you based on your BMI, health history, and any weight-related conditions. The entire process — consultation, prescription, and delivery — usually takes 3–7 days. To check your eligibility, use our free BMI calculator to see where your BMI falls, as this determines whether you meet the standard criteria (BMI 30+, or BMI 27+ with weight-related health conditions like type 2 diabetes or high blood pressure).
- Doses 2.5 mg to 7.5 mg: typically £129–£180/month
- Doses 10 mg to 15 mg: typically £200–£320/month
- Online consultation fee: £20–£60 (one-off or per prescription depending on provider)
- Prescription validity: usually valid for repeat orders
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 vs Private Access: Which Is Right for You?
NHS access is free but requires referral to a tier 3 specialist weight management service through your GP — these services are typically available only in hospital trusts or specialist clinics. Waiting lists vary by region (ICB) and can be several months to over a year in many areas. Once you're assessed and approved by the NHS specialist team, Mounjaro is provided at no cost under your prescription exemption. Private access offers faster treatment (3–7 days typically) but costs £129–£320 monthly depending on dose. Neither route assures weight loss — both require a clinical assessment, and individual results vary significantly. Consider NHS access if you have time to wait and want no medication costs; choose private if you prefer faster access and can afford the cost. Before starting any weight loss injection, use our free GLP-1 weight loss calculator to understand potential outcomes at different doses alongside a reduced-calorie diet and increased physical activity.
- 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 Mounjaro KwikPen cost privately in the UK?
A single Mounjaro KwikPen (4 weeks' supply) typically costs £129–£320 depending on the dose. Lower starting doses like 2.5 mg and 5 mg are usually £129–£180, while higher doses like 10 mg to 15 mg cost £200–£320. Prices vary between different online pharmacies, and you may need to factor in an online consultation fee (£20–£60) for your first prescription.
Can I get Mounjaro free on the NHS in the UK?
Yes, Mounjaro is available free through NHS specialist weight management services. However, you need a GP referral to a tier 3 specialist clinic, and waiting lists can be very long in many areas (months to over a year depending on your region). Once approved by the NHS specialist team, there is no cost for the medication under prescription exemption.
How do I get a Mounjaro prescription privately in the UK?
Register with a GPhC-registered online pharmacy offering Mounjaro. You'll complete an online health questionnaire and have a consultation with a UK-licensed prescriber. If approved, your prescription is issued and the medication is delivered, usually within 3–7 days. You pay for both the consultation and the KwikPen.
Is private Mounjaro more expensive than Wegovy in the UK?
Mounjaro and Wegovy (semaglutide) have similar private pricing, typically £129–£320 per month depending on dose. The final cost depends on which online pharmacy you use and what dose you're prescribed. Compare prices across providers before choosing — not all offer identical pricing at every dose level.
Why do Mounjaro prices vary between different UK pharmacies?
Different online pharmacies purchase stock at different prices and charge different consultation fees. They may also offer different starting packages (e.g., some bundle consultation into the first KwikPen cost, others charge separately). Competition between providers means prices aren't standardised — it's worth comparing a few to find the best value for your dose.
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.