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 Injections in the UK: Cost and Access
Mounjaro (tirzepatide) is a prescription-only weight loss injection now available in the UK through both NHS specialist services and private online prescribing. Access and cost vary significantly depending on which route you choose. This guide explains how to get Mounjaro in the UK, what it costs, NHS eligibility, and what to expect from an online clinical assessment. Use our free BMI calculator to check your eligibility based on NHS thresholds, and try our GLP-1 weight loss calculator to estimate potential results.
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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.
How Much Does Mounjaro Cost in the UK?
Private Mounjaro costs in the UK typically range from £129 to £320 per month, depending on your starting dose. The cost increases with each dose escalation as you progress through the titration schedule. A Mounjaro KwikPen contains four weekly doses, so monthly costs reflect the dose strength you're using. At the starting dose of 2.5 mg, costs are lower; at the maintenance dose of 15 mg, costs are at the higher end. These prices are set by individual GPhC-registered pharmacies and private prescribing services, so it's worth comparing options. Some private providers offer subscription models where you pay monthly; others require per-prescription purchase. NHS Mounjaro access is free through the NHS, but availability is extremely limited and regional variation is significant. NICE has approved tirzepatide for NHS use within specialist tier 3 and 4 weight management services, but you must be referred by your GP and may face waiting lists of several months to over a year in many areas.
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: Routes to Getting Mounjaro
NHS route: Referral from your GP to a local tier 3 weight management service. Assessment by a specialist team, then prescription through the NHS. Free medication, but limited availability and long waiting lists in many regions.
Private route: Online consultation with a UK-licensed prescriber (usually takes 24–48 hours). If approved, prescription sent to a GPhC-registered pharmacy. Medication delivered to your home. Available immediately, but costs apply. You'll need to complete a medical questionnaire, and the prescriber will assess your BMI, health conditions, and current medications to ensure Mounjaro is suitable.
- 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 on the NHS in the UK?
Yes, Mounjaro is approved by NICE for NHS use, but only through specialist tier 3 or 4 weight management services. You must be referred by your GP, and availability varies greatly by region. Waiting times can be several months to over a year. Private access is often faster but costs apply.
How much does private Mounjaro cost per month?
Private Mounjaro typically costs £129–£320 per month depending on your dose. Starting doses (2.5 mg) are cheaper; maximum doses (15 mg) are more expensive. Prices vary between GPhC-registered pharmacies and prescribing services, so compare options before committing.
What happens during an online Mounjaro consultation?
You'll complete a detailed health questionnaire covering your weight, BMI, medical history, current medications, and any weight-related conditions. A UK-licensed prescriber reviews this and may ask follow-up questions. If approved, a prescription is issued to a pharmacy. The entire process typically takes 24–48 hours.
Am I eligible for Mounjaro?
Generally yes, if you have a BMI of 30 or above, or 27 or above with a weight-related health condition (type 2 diabetes, high blood pressure, heart disease, sleep apnoea). Lower thresholds apply for people of South Asian, Chinese, Black African, or Black Caribbean heritage. Use our free BMI calculator to check your status.
Do I need to see my GP before getting Mounjaro privately?
You don't need a GP referral for private access, but it's advisable to inform your GP that you're considering or using Mounjaro, especially if you're on other medications. The private prescriber will assess your medical suitability before issuing a prescription.
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.