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 Mounjaro Cost in the UK?
If you're looking for the cheapest way to access Mounjaro in the UK, cost depends on whether you're using the NHS or private prescribing. Mounjaro (tirzepatide) is a prescription-only weight management injection, and the price varies significantly by route. This guide explains where to find the most affordable options and what to expect when accessing this medication through different channels.
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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 vs Private Mounjaro Costs
NHS Access: Mounjaro is free on the NHS if prescribed through specialist tier 3 or tier 4 weight management services. However, NHS availability is extremely limited — waiting lists can exceed 18 months in many regions, and access criteria are strict. Your GP must refer you to a specialist service, which is not always available in every integrated care board area.
Private Prescribing: Through a GPhC-registered online pharmacy following a clinical assessment, private Mounjaro costs typically range from £120 to £180 per month for starter doses (2.5–5 mg) and £200 to £320 per month for maintenance doses (10–15 mg tirzepatide). The cheapest option is usually the lowest effective dose — many people achieve good results on 5 mg or 7.5 mg rather than the maximum 15 mg dose.
- Starter dose (2.5 mg): approximately £120–£150/month
- Mid-range dose (5–7.5 mg): approximately £150–£220/month
- Higher doses (10–15 mg): approximately £250–£320/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.
How to Access Mounjaro Most Affordably
The most cost-effective approach depends on your circumstances. If you qualify for NHS access, waiting is free but delays can be significant. For private access, start with the lowest dose that works for you — many people see effective results on 5 mg weekly rather than escalating to 15 mg. Compare prices across GPhC-registered pharmacies, as some offer loyalty discounts or bulk-purchase savings. You can also use our free GLP-1 weight loss calculator to estimate your potential results at different doses, helping you decide whether to start at a lower dose. Some private services also offer payment plans, making monthly costs more manageable. Always check that your provider is properly registered — your prescriber should be a UK-licensed doctor.
- 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 ever free on the NHS?
Yes, Mounjaro is free on the NHS if prescribed through specialist tier 3 or tier 4 weight management services. However, access is limited and waiting lists are very long in most regions. Your GP can refer you, but not all areas have these services funded.
What's the typical cost of private Mounjaro in the UK?
Private Mounjaro costs roughly £150–£250/month depending on dose. Starter doses (2.5–5 mg) are cheaper; higher doses (10–15 mg) cost more. Prices vary by pharmacy — compare registered providers to find the best rate.
Is tirzepatide cheaper than Wegovy?
Prices for Mounjaro (tirzepatide) and Wegovy (semaglutide) are similar in most UK pharmacies, ranging £150–£250/month. Direct comparison depends on your dose and provider — both require a prescription and clinical assessment.
Can I get a cheaper Mounjaro dose by starting lower?
Yes. Many people achieve good weight loss results on 5 mg or 7.5 mg weekly rather than the maximum 15 mg dose. A lower dose costs less and may have fewer side effects. Work with your prescriber to find the lowest effective dose for you.
What's the difference between Mounjaro and Ozempic?
Both contain similar mechanisms, but Mounjaro is licensed specifically for weight management in the UK. Ozempic is approved for type 2 diabetes. Mounjaro (tirzepatide) has a dual GIP and GLP-1 mechanism, whereas Wegovy is GLP-1 only — different mechanism, different clinical profile.
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.