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 Information — UK Costs and Access Routes
Mounjaro (tirzepatide) is a prescription-only injectable weight management medication available in the UK through both NHS specialist services and private online prescribing. This guide explains how to access Mounjaro, what it costs, eligibility criteria, and the differences between NHS and private routes. Whether you're considering this dual GIP and GLP-1 receptor agonist for weight management, understanding your access options and the prescription process is essential before deciding which route suits your situation.
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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 in the UK — Private Access
Private prescription costs for Mounjaro in the UK typically range from £150 to £320 per month, depending on the dose and the prescribing provider. Starting doses (2.5 mg) are usually at the lower end of this range, whilst higher maintenance doses (15 mg) cost significantly more. Each KwikPen contains 4 weeks of once-weekly injections.
Private access involves:
- Online consultation with a UK-licensed prescriber (usually £20–£50)
- Clinical assessment questionnaire about your weight, health conditions, medications, and eligibility
- Prescription issued if clinically appropriate
- Dispensed by a GPhC-registered pharmacy and delivered to your home
- Ongoing repeat prescriptions without reassessment (in most cases)
Private costs can add up over time — a 12-month course at 15 mg could cost £3,000–£3,800. However, private access avoids NHS waiting lists and does not require referral to specialist services. Always use our GLP-1 weight loss calculator to explore potential outcomes alongside cost considerations.
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 Is Right?
NHS route: Free at point of use but accessed only through tier 3 specialist weight management services. Your GP must refer you, and waiting lists in many regions are 6–24 months. Not all ICBs (Integrated Care Boards) currently prescribe tirzepatide, so availability varies by location.
Private route: Immediate access following online consultation — no waiting lists or GP referral needed. You pay the full prescription cost upfront, typically £150–£320 monthly depending on dose. Use our BMI calculator to confirm you meet eligibility criteria (BMI 30+, or 27–29.9 with weight-related health conditions). Private providers assess your suitability through a detailed online questionnaire before issuing a prescription, ensuring safety and appropriateness just as NHS services would.
- 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 on the NHS?
Mounjaro is free on the NHS if prescribed through a specialist weight management service (tier 3 or 4). However, access requires a GP referral and availability varies significantly by region. Many areas have waiting lists of several months to over a year due to high demand and limited specialist services.
What is the private cost of Mounjaro in the UK?
Private prescriptions typically cost £150–£320 per month depending on your dose. A starting 2.5 mg dose is cheaper than maximum 15 mg doses. Monthly costs can reach £3,000–£3,800 annually. This includes the consultation, prescription, and medication delivered to your home.
What is the online consultation process for private Mounjaro?
You complete an online health questionnaire covering your weight, height, medical history, current medications, and weight loss goals. A UK-licensed prescriber reviews your information and assesses eligibility based on NHS criteria (BMI 30+, or 27–29.9 with health conditions). If approved, a prescription is issued and sent to a GPhC-registered pharmacy for dispensing.
Can I get Mounjaro through my GP without a specialist referral?
Standard NHS GP practices do not prescribe Mounjaro. You need a referral to a specialist tier 3 weight management service, which involves assessment and potential waiting lists. Alternatively, you can access private prescriptions immediately through online clinical assessment without NHS involvement.
Does Mounjaro cost the same across all private providers?
Costs vary between GPhC-registered online pharmacies and prescribing services. Consultation fees (£20–£50), medication prices (£150–£320/month), and delivery charges differ. Compare options and ensure any provider is GPhC-registered and has qualified UK-licensed prescribers before proceeding.
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.