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 in the UK — Cost and Access Guide
Mounjaro (tirzepatide) is available in the UK through both NHS specialist services and private prescription routes. Access, cost, and waiting times vary significantly depending on which route you choose. This guide explains how to get Mounjaro as a weight loss injection in the UK, what it costs privately, and how NHS access works. Understanding your options helps you make an informed decision about whether this prescription weight loss treatment 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.
Private Access and Cost in the UK
Private prescription routes are currently the fastest way to access Mounjaro in the UK. Following an online clinical assessment with a UK-licensed prescriber, Mounjaro can be dispensed by GPhC-registered pharmacies. Private costs vary by dose and provider, typically ranging from approximately £129 to £320 per month, with higher doses costing more. A standard 4-week supply (one KwikPen with 4 doses) at the 15mg maximum dose usually costs around £280–£320. Prices can vary significantly between providers, so comparing options is worthwhile. Some private services offer package discounts for committing to longer treatment periods. Payment is typically required upfront before dispensing, though some providers offer payment plans. Private access means no NHS waiting lists — you can often receive your first dose within 1–2 weeks of assessment.
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: What You Need to Know
NHS access to Mounjaro is through specialist tier 3 weight management services, not your GP. You'll need a referral from your GP to a local specialist service, which assesses whether you're eligible based on your BMI and health conditions. NHS prescription is free at point of use once approved, but availability varies dramatically by region — some areas have long waiting lists (6–18 months), while others have limited capacity. The NHS route involves more comprehensive support including dietitian review and behavioural support, but requires patience. Private online consultations typically take 15–30 minutes via video or phone with a UK-licensed doctor or nurse prescriber. You'll be asked about your weight, height, medical history, medications, and weight loss goals. The prescriber assesses whether Mounjaro is clinically appropriate for you based on your BMI and health profile.
- 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.
Can I get Mounjaro free on the NHS in the UK?
Yes, Mounjaro is available free on the NHS through specialist tier 3 weight management services. However, you need a GP referral and eligibility assessment. Availability and waiting times vary significantly by region — some areas have waiting lists of many months. Private prescription routes are faster but involve upfront costs.
How much does Mounjaro cost privately in the UK per month?
Private Mounjaro typically costs £129–£320 per month depending on the dose and provider. A full 4-week supply (one KwikPen) at maximum dose (15mg) usually costs around £280–£320. Prices vary between providers, so it's worth comparing options before committing.
How long does a private online consultation for Mounjaro take?
A private online consultation typically lasts 15–30 minutes. A UK-licensed prescriber will review your medical history, weight, BMI, current medications, and weight loss goals. If appropriate, they'll issue a prescription that can be dispensed by a GPhC-registered pharmacy within days.
Do I need to be referred by my GP to get Mounjaro privately?
No — private prescription Mounjaro does not require a GP referral. You can book a private online consultation directly. However, it's good practice to inform your GP you're considering weight loss treatment, as they may have relevant medical information to share with the prescriber.
What's the difference between NHS and private Mounjaro in the UK?
NHS Mounjaro is free but requires a GP referral, specialist assessment, and often involves waiting lists. Private Mounjaro costs money but is faster (1–2 weeks) and doesn't require NHS referral. NHS typically includes dietitian support; private routes vary. Both require clinical assessment and prescription from a UK-licensed 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.