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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How Much Is Mounjaro in the UK?
Mounjaro (tirzepatide) is available in the UK through two routes: NHS specialist services and private prescription. The cost varies significantly depending on which route you choose and the dose required. This guide explains UK pricing, how to access Mounjaro through your GP, private online consultations, and what you'll need to budget if pursuing private prescription. We'll cover the full picture so you can understand your options.
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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.
Mounjaro Cost Through Private Prescription in the UK
Private Mounjaro costs in the UK typically range from £129 to £320 per month, depending on the dose and pharmacy. Starting doses (2.5 mg) are usually at the lower end, whilst higher maintenance doses (15 mg) cost more. Each KwikPen contains four weeks' worth of doses, so monthly pricing applies. Costs can vary between providers — shopping around and comparing GPhC-registered online pharmacies is sensible. Some providers offer subscription discounts if you commit to multiple months upfront. Important to note: private prescription requires an online clinical assessment with a UK-licensed prescriber, which typically costs £30–£60 separately. This assessment checks your suitability for tirzepatide and reviews your medical history before issuing a prescription. Total first-month cost is usually prescription cost plus medication cost.
- Budget £129–£180 for lower doses (2.5–5 mg)
- Budget £200–£260 for mid-range doses (7.5–10 mg)
- Budget £280–£320 for maximum doses (12.5–15 mg)
- Clinical assessment fee: £30–£60 (one-time)
- Repeat prescriptions are quicker and do not require reassessment each month
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 Route — Which Is Right for You?
NHS access to Mounjaro is free once prescribed, but availability is limited. NICE has approved tirzepatide for NHS use within specialist tier 3 and tier 4 weight management services. To access this, you need a GP referral to your local Integrated Care Board (ICB) specialist weight management service. Waiting lists vary dramatically by region — some areas have waits of several months or years. Private prescription avoids NHS waiting lists but costs £200–£400 per month depending on dose. An online consultation takes 10–20 minutes and can be completed within days. Choose NHS if you can wait and prefer free treatment; choose private if you need to start quickly and can afford the cost. Use our free GLP-1 weight loss calculator to estimate potential outcomes at different doses, helping you decide if either route is right for you.
- 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 for free?
Yes, but access is limited. NICE has approved tirzepatide for NHS specialist weight management services. You need a GP referral to your local specialist service. Availability and waiting times vary significantly by region — some areas have very long waiting lists. Once approved and prescribed by the NHS, there is no cost to you.
How long does an online clinical assessment take for private Mounjaro prescription?
Online assessments typically take 10–20 minutes. You'll answer health questions, discuss your weight loss goals, and the prescriber will review your medical history. If approved, you'll receive a prescription within 24 hours in most cases. The consultation fee (£30–£60) is usually charged separately from medication cost.
What's the difference between private Mounjaro cost and Wegovy cost in the UK?
Mounjaro and Wegovy have similar pricing ranges (£129–£320 per month depending on dose), though exact costs vary by provider. Mounjaro reaches a maximum dose of 15 mg weekly, whilst Wegovy reaches 2.4 mg weekly. Both require a UK prescription and clinical assessment. Comparing providers is recommended for both medications.
Do I need to pay for repeat Mounjaro prescriptions each month?
Yes, each month you'll pay for the medication refill. However, you typically won't need another clinical assessment after the first one — just reorder and pay for the KwikPens. Some private providers offer subscription discounts if you pay upfront for multiple months, which can reduce the per-month cost slightly.
How do I know if I'm eligible for Mounjaro prescription?
You're likely eligible if you have a BMI of 30 or above, or 27–29.9 with weight-related health conditions (type 2 diabetes, high blood pressure, cardiovascular disease, etc.). For South Asian, Chinese, Black African, or Black Caribbean adults, lower thresholds apply. An online prescriber will assess your individual suitability during consultation.
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.