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
Free tracker included with every download this week
Mounjaro Weight Loss — UK Cost and Access Guide
Mounjaro (tirzepatide) is a prescription-only weekly weight loss injection available in the UK through both NHS and private routes. Understanding the cost, eligibility, and access pathways can help you make informed decisions about whether this GLP-1 receptor agonist medication is right for your situation. This guide explains how to access Mounjaro, what to expect from the process, and what you might pay depending on your chosen route.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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: Cost and How to Get Mounjaro in the UK
Private Mounjaro is typically accessed through UK-licensed online prescription services following a brief clinical assessment. Private costs vary significantly by dose and provider, but generally range from £129 to £320 per month. This covers the prescription assessment, Mounjaro itself, and delivery to your home. Starting doses (2.5 mg) are usually at the lower end; maximum doses (15 mg) at the higher end. Each KwikPen contains four weekly injections, so a month's supply represents one pen.
The private route is faster than NHS — you can typically receive your first injection within 7–10 days of your initial online consultation. A UK-licensed prescriber reviews your medical history and current medications to confirm you meet eligibility criteria. If approved, a prescription is issued to a GPhC-registered pharmacy, which dispenses and ships your Mounjaro directly.
- No NHS referral required
- No waiting lists
- Prescription issued same day or next working day
- Delivered within 3–5 working days
- Repeat prescriptions managed online for convenience
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: Which Route Suits You?
NHS access to Mounjaro is through specialist tier 3 weight management services, typically accessed via GP referral. The advantage: treatment is free. The disadvantage: availability varies dramatically by region, and waiting lists can extend to 6–18 months in many areas. Not all NHS regions currently offer Mounjaro — some still restrict to tier 2 services only.
Private access costs money but offers speed and certainty. Use our free BMI calculator and GLP-1 weight loss calculator to assess your eligibility and project potential results before you commit. If cost is a barrier, speak to your GP about NHS referral options in your area. Many people combine both routes: waiting for NHS while self-funding private treatment initially.
- 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 Mounjaro cost per month on the NHS?
Mounjaro is free on the NHS when prescribed through a specialist tier 3 weight management service. However, NHS availability varies significantly by region, and referral waiting times can be 6–18 months.
What's the typical private cost for Mounjaro in the UK?
Private Mounjaro costs approximately £129–£320 per month depending on dose and provider. Starting dose (2.5 mg) is usually £129–£180; maximum dose (15 mg) around £280–£320. This includes the prescription assessment and delivery.
Can I get Mounjaro without a prescription in the UK?
No. Mounjaro is prescription-only in the UK. You must have a prescription from a UK-licensed healthcare prescriber, either via NHS referral or private online consultation, before any pharmacy can dispense it.
How quickly can I access Mounjaro privately?
Private access is typically faster than NHS. After your online consultation, a prescription can be issued same-day or next working day, and Mounjaro delivered within 3–5 working days.
Do I need to go to a clinic to get Mounjaro on the NHS?
Yes, NHS access requires referral to a specialist tier 3 weight management service, usually in a hospital or integrated care hub. You'll attend for assessment before Mounjaro is prescribed and you'll receive ongoing support and monitoring.
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.