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 Does 10mg Mounjaro Cost in the UK?
The cost of 10mg Mounjaro (tirzepatide) in the UK varies significantly depending on whether you access it through the NHS or privately. A single 10mg dose typically costs between £129 and £185 through private online prescribing services, though this varies by provider. NHS access is free at the point of prescription, but availability is limited and often involves substantial waiting times. Your eligibility depends on your BMI, health conditions, and region. This guide explains both routes, what to expect during the assessment process, and how prescription costs compare to help you 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.
Private Prescription Costs and Access in the UK
Private prescription costs for Mounjaro in the UK typically range from £129 to £185 per 10mg dose, depending on the provider and whether you're starting treatment or already established. A standard four-week supply (one KwikPen with four pre-filled doses) costs between £300 and £400 per month at the 10mg dose level.
To access Mounjaro privately, you'll need to complete an online clinical assessment with a UK-licensed prescriber. This usually takes 24–48 hours. The assessment covers your medical history, current medications, weight, height, and BMI. If approved, your prescription is issued electronically to a GPhC-registered pharmacy, which then dispatches your medication.
Private access is available without NHS referral or waiting lists, making it faster than NHS routes. However, costs are your responsibility — unlike NHS prescriptions, private treatment is not subsidised. Many people consider this worth the cost for immediate access to a dose that matches their weight management needs.
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 and Eligibility
NHS access to Mounjaro is free at point of prescription but involves referral to a specialist tier 3 weight management service. Waiting times vary dramatically by region — some areas have waits of several months or over a year. Your GP refers you; the specialist service then assesses eligibility based on BMI ≥30, or BMI ≥27 with weight-related health conditions like type 2 diabetes, hypertension, or sleep apnoea.
Private prescription routes bypass NHS waiting lists entirely, offering faster access but at personal cost. Eligibility criteria are the same — you must meet the BMI or BMI + comorbidity threshold. The key difference is speed: private prescriptions typically deliver within 3–5 days, while NHS routes can take months.
Calculate your BMI using our free BMI calculator to check your eligibility. Compare the GLP-1 weight loss calculator to estimate potential outcomes at the 10mg dose, helping you weigh the cost against expected results.
- 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 typical cost of a 10mg Mounjaro prescription privately in the UK?
A single 10mg dose typically costs £129–£185 through private online prescribing providers. A four-week supply (one KwikPen) costs approximately £300–£400. Costs vary by provider, whether you're new to treatment, and your dose level. Always check with your chosen provider for exact pricing.
Can I access Mounjaro through the NHS without paying?
Yes, Mounjaro is free through the NHS, but you need referral to a specialist tier 3 weight management service. This requires GP referral and eligibility assessment. However, NHS waiting times are currently very long in most regions — often several months to over a year depending on your area.
How long does a private prescription take to arrive?
Private Mounjaro prescriptions typically arrive within 3–5 working days after your online clinical assessment is approved. The assessment itself takes 24–48 hours. This is much faster than NHS routes, which involve waiting lists before specialist assessment even begins.
What happens if I don't meet the BMI threshold for Mounjaro?
If your BMI is below 30 (or below 27 if you don't have weight-related health conditions), you won't be eligible for Mounjaro on either NHS or private prescription. However, a prescriber will review your individual circumstances. Speak with your GP about other evidence-based weight management options suitable for you.
Is the cost of Mounjaro covered by private health insurance?
Most standard private health insurance policies do not cover weight management medications like Mounjaro, as they're often classified as elective rather than essential treatment. Check your specific policy documents. Some specialist weight management insurance may offer coverage — contact your insurer directly for clarification.
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.