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 Weight Loss: Cost, Access & How to Get It in the UK
Mounjaro (tirzepatide) is a prescription-only weight loss injection available in the UK through both NHS specialist services and private online prescribing. Understanding the costs, eligibility criteria, and access routes can help you make informed decisions about whether this weekly weight loss injection is right for you. This guide explains what Mounjaro is, how much it costs in the UK, and the different ways to access it—whether through the NHS or private prescription.
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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 Cost in the UK
Private Mounjaro prescriptions in the UK typically cost between £129 and £320 per month, depending on your dose and the prescribing provider. The KwikPen device contains four weekly doses, so each pen covers one month of treatment. Starting doses (2.5 mg) are usually at the lower end of this range, while maximum doses (15 mg) cost more. Some providers offer discounts for upfront payment of multiple months. It's important to note that private prescriptions are issued by UK-licensed prescribers following an online clinical assessment—you do not need an NHS referral. The assessment typically costs £15–£30 and is often waived if you proceed with a prescription. Private access means you can start treatment much faster than NHS routes, which often have significant waiting lists. Use our free GLP-1 weight loss calculator to explore potential weight loss at different Mounjaro doses and understand the investment relative to your goals.
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 Routes: How to Access Mounjaro
NHS route: Mounjaro is available through NHS specialist tier 3 weight management services following NICE approval. However, access is limited and highly variable by region (integrated care board). Your GP can refer you to a specialist weight management service, but waiting times can be many months or even years in some areas. The NHS provides Mounjaro free at point of use once approved.
Private route: You can obtain Mounjaro privately without an NHS referral. Complete an online consultation with a UK-licensed prescriber, who will assess your eligibility (BMI, health conditions, medications). If approved, a prescription is issued to a GPhC-registered pharmacy and delivered to your home. This process typically takes 3–7 days from consultation to first dose. Check your BMI using our free calculator to see whether you meet standard eligibility criteria (BMI 30+, or 27+ with weight-related health conditions).
- 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.
What's the difference between Mounjaro on the NHS and private prescription?
NHS Mounjaro is free but accessed through specialist weight management services with long waiting lists and regional variation. Private Mounjaro requires payment (£129–£320/month) but is faster to access without NHS referral. Both require a clinical assessment and prescription from a UK-licensed prescriber.
Does Mounjaro cost differ between providers?
Yes. Private Mounjaro costs typically range £129–£320/month depending on dose and provider. Some offer bundle discounts for multiple months upfront. Prices may vary slightly between different online prescribing services. Always check exact costs before committing.
What's included in the Mounjaro cost?
The monthly cost covers the KwikPen device (four weekly doses) and delivery. The clinical consultation fee is usually separate (£15–£30) or waived if you proceed with a prescription. Some providers include follow-up support or dose adjustments in their pricing.
How long does it take to get Mounjaro through private prescription?
From online consultation to receiving your first KwikPen typically takes 3–7 days. The consultation appointment can often be booked within 24 hours. NHS routes are slower due to referral and specialist service waiting lists, which can exceed 12 months in many areas.
Am I eligible for Mounjaro? How do I check?
General eligibility: BMI 30+, or BMI 27–29.9 with weight-related health conditions (diabetes, high blood pressure, cardiovascular disease). South Asian, Chinese, Black African, or Black Caribbean adults may qualify at lower BMI thresholds. A prescriber assesses your full medical history during consultation. Use our BMI calculator to check your starting point.
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.