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
What is the Price of Mounjaro in the UK?
The cost of Mounjaro in the UK varies significantly depending on whether you access it through the NHS or via private prescription. Through NHS specialist weight management services, Mounjaro is available at no direct cost to eligible patients, though access is limited and varies by region. Via private online prescribing, Mounjaro typically costs between £140 and £320 per month depending on your dose and the provider. Understanding both routes, eligibility criteria, and what affects pricing can help you make an informed decision about accessing this GLP-1 and GIP receptor agonist medication.
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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.
NHS Access and Cost: What You Need to Know
Through the NHS, Mounjaro is free at point of use for eligible patients prescribed through tier 3 or tier 4 specialist weight management services. However, NHS access is highly restricted and varies significantly by region. NICE (National Institute for Health and Care Excellence) has approved tirzepatide for use within NHS specialist weight management services, but availability depends on your local Integrated Care Board (ICB) and current capacity. Many NHS services have long waiting lists — in some areas, waiting times exceed 18 months. You cannot obtain Mounjaro through your GP alone; referral to a specialist tier 3 or tier 4 service is required. The dose titration schedule (starting at 2.5 mg and escalating weekly) means treatment extends over several months before reaching maintenance doses of 10–15 mg. NHS prescriptions are dispensed without charge once approved, though access itself remains the primary barrier in most regions.
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.
Private Mounjaro Pricing and How to Access It
Private Mounjaro costs typically range from £140 to £320 per month, depending on your starting dose and the provider. Each KwikPen contains 4 weeks of doses, so monthly supply is standard. Initial doses (2.5 mg) are often cheaper than maintenance doses (10–15 mg). Private access requires an online clinical assessment with a UK-licensed prescriber — you do not need an NHS referral. Once approved, your prescription is dispensed by a GPhC-registered pharmacy and delivered to you. This route is faster than NHS access and doesn't depend on regional waiting lists. To compare costs and find your current eligibility, use our free GLP-1 weight loss calculator, which helps estimate potential outcomes at different doses, allowing you to make a cost-benefit decision.
- 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 in the UK?
Mounjaro is free through the NHS for eligible patients prescribed via tier 3 specialist weight management services. However, availability is extremely limited and varies by region. Waiting lists can be 18+ months in many areas. Access requires specialist referral — you cannot obtain it from your GP.
What is the typical monthly cost of private Mounjaro in the UK?
Private Mounjaro costs between £140–£320 per month, depending on your dose. Initial doses (2.5 mg) are generally cheaper than higher maintenance doses (10–15 mg). Each KwikPen supplies 4 weeks of injections. Prices vary by online prescribing provider.
What affects the price of Mounjaro when accessing it privately?
Your dose significantly affects price — higher doses cost more. The specific provider you choose also impacts cost due to different service fees. Some providers charge consultation fees separately, whilst others include assessment in the overall price. Tirzepatide itself is the same medication regardless of provider.
Is Mounjaro cheaper than Wegovy in the UK?
Pricing is comparable — both typically cost £140–£320 per month via private prescribing. Mounjaro and Wegovy have different mechanisms (dual GIP/GLP-1 vs single GLP-1), and individual results vary. Your choice should be based on clinical suitability and prescriber guidance, not price alone.
Can I get Mounjaro through my GP on the NHS?
No. Mounjaro is only prescribed through NHS tier 3 or tier 4 specialist weight management services following referral from your GP. Standard GP prescribing is not available. You must meet specific eligibility criteria (BMI ≥30 or ≥27 with weight-related health conditions) and be accepted into a specialist service first.
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.