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) costs vary significantly depending on whether you access it through the NHS or privately in the UK. Private prescription costs typically range from £129 to £320 per month depending on the dose, whilst NHS access is free but involves waiting lists and regional variation. This guide explains both routes, what affects the price, and how to explore your options with a GP or licensed prescriber.
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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.
Mounjaro Cost: Private Prescription Pricing In The UK
Private prescription costs for Mounjaro (tirzepatide) in the UK are set by individual GPhC-registered online pharmacies and vary based on the dose you're prescribed. Starting doses (2.5 mg) typically cost around £129–£180 per month, whilst maintenance doses (10–15 mg) generally range from £200–£320 per month. Each KwikPen contains four weekly injections, so monthly costs equate to a four-week supply.
- 2.5 mg dose: approximately £129–£150
- 5 mg dose: approximately £149–£180
- 10 mg dose: approximately £199–£250
- 15 mg dose: approximately £250–£320
Important: prices vary between providers and may change. Before starting, confirm the exact cost with the prescriber and pharmacy. Many people also factor in the cost of the online clinical consultation (typically £40–£80), though some providers include this in their package pricing.
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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: Routes To Getting Mounjaro In The UK
NHS route: Mounjaro is available through NHS specialist tier 3 weight management services, but only following referral from your GP. Access is free, but availability varies dramatically by region (ICB area) and waiting lists can be 6–18 months in many areas. Your GP will assess whether referral is appropriate based on your BMI, health conditions, and local criteria.
Private route: GPhC-registered online pharmacies offer Mounjaro following a remote clinical assessment with a UK-licensed prescriber. This typically takes 24–48 hours from consultation to prescription. No GP referral needed. Use our free BMI calculator and GLP-1 weight loss calculator to understand your eligibility and projected outcomes before consulting a prescriber.
Online consultation process: You complete a health questionnaire, a prescriber reviews it (usually within 24 hours), and if appropriate, issues a prescription to a pharmacy. The pharmacy dispenses your KwikPen and delivers it to your address. You'll receive clear injection instructions and can contact the prescriber for dose adjustments after 4 weeks. All prescribers must be UK-licensed and all pharmacies must be GPhC-registered.
- 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.
Is Mounjaro cheaper on the NHS?
Yes, Mounjaro is free on the NHS if prescribed through a specialist weight management service. However, access requires a GP referral and significant waiting lists exist in many regions (often 6–18 months). Private prescription costs range from £129–£320/month depending on dose. The trade-off is speed vs cost.
Why does Mounjaro cost different amounts at different pharmacies?
GPhC-registered pharmacies set their own pricing within a market range. Costs reflect dispensing fees, delivery, clinical support, and consultation inclusion. Compare prices across several providers before choosing, and confirm the total cost including any consultation fees upfront.
Can I get Mounjaro on prescription through my GP?
Your GP can refer you to specialist NHS weight management services (tier 3), where a specialist may prescribe Mounjaro. Standard GPs cannot prescribe Mounjaro directly for weight management under current NHS guidance. Private prescribing is available without NHS referral via online consultation.
What does the price of Mounjaro include?
Private pricing typically covers the KwikPen, delivery, and initial clinical assessment. Some providers include dose adjustment consultations and ongoing support; others charge separately. Always confirm exactly what's included before paying. NHS prescription includes the medication only; GP support is separate.
How do I know if I'm eligible for Mounjaro?
Eligibility criteria include BMI ≥30 kg/m², or BMI 27–29.9 with weight-related health conditions (diabetes, hypertension, heart disease). Ethnic-specific thresholds apply for South Asian, Chinese, and Black African backgrounds. Use our free BMI calculator to check your status, then consult a GP or licensed prescriber for personalised assessment.
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.