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 Long-Term Use: Cost and Access in the UK
Using Mounjaro long-term means committing to ongoing weekly injections as part of your weight management plan. The cost and how you access Mounjaro in the UK depends on whether you choose NHS specialist services or private prescription routes. Understanding both options, including maintenance doses, long-term expenses, and eligibility criteria, helps you make an informed decision about sustained treatment.
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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 Mounjaro Access and Long-Term Costs in the UK
Private access to Mounjaro tirzepatide in the UK typically costs between £129 and £320 per month, depending on your dose and the provider. Once you've titrated to your maintenance dose—usually 10 mg or 15 mg weekly—long-term costs remain consistent for each four-week supply of pre-filled KwikPens. Most providers require an initial online clinical assessment (usually £20–£50), then a prescription fee for each supply. At the maximum 15 mg dose, expect to budget around £250–£320 monthly. Over a year, this equates to roughly £1,500–£3,840. Some private providers offer subscription models or loyalty discounts for repeat prescriptions. You'll need to factor in regular check-ins with your prescriber—typically every 3–6 months—which may incur additional costs. The process is straightforward: online consultation, assessment by a UK-licensed prescriber, prescription issued, and delivery via a GPhC-registered pharmacy.
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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 vs Private: Long-Term Access to Mounjaro
The NHS route is free at point of use, but access is limited. You'll need a GP referral to a tier 3 specialist weight management service, and waiting lists can extend from months to over a year depending on your region. Once approved by an NHS specialist team, you receive prescriptions and monitoring at no cost. However, regional commissioning decisions mean some areas have very limited or no availability. The private route offers immediate access without waiting, ideal if you want to start long-term treatment quickly. Private prescribers assess your eligibility just as rigorously as the NHS—checking BMI, weight-related conditions, and contraindications. Many people use private access while on NHS waiting lists, then potentially switch to NHS if approved later. Our GLP-1 weight loss calculator can help you project long-term weight loss outcomes, allowing you to weigh the investment 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.
How much does Mounjaro cost per month in the UK on private prescription?
Private Mounjaro costs typically range from £129–£320 per month depending on your maintenance dose. At 5 mg, expect around £129–£180/month; at 10 mg, £180–£250/month; at 15 mg, £250–£320/month. Prices vary between providers, and some offer subscription discounts for regular prescriptions.
Is Mounjaro free on the NHS in the UK?
Yes, Mounjaro is free on the NHS if prescribed by a specialist weight management service. However, NHS access requires a GP referral and approval by a tier 3 specialist team. Waiting lists are often lengthy (several months to over a year), and availability varies significantly by region and local commissioning decisions.
What ongoing costs should I budget for long-term Mounjaro use?
Beyond the medication cost, budget for regular prescriber check-ins (every 3–6 months, typically £20–£50 each via private routes). NHS care includes free monitoring. You may also need periodic blood tests or GP consultations. Calculate yearly costs: at maximum dose, roughly £3,000–£3,840 privately per year, plus check-in fees.
Can I switch from private to NHS Mounjaro treatment?
Yes, many people start privately then switch to NHS once approved by a specialist service. However, there's no automatic transfer—you'll need a separate NHS referral and approval process. Some areas allow continuity of care; others may require a restart of your treatment plan.
How long do most people take Mounjaro for weight management?
Mounjaro is typically used long-term (6 months to several years) as part of ongoing weight management. Unlike short-term diets, it's designed for sustained use alongside lifestyle changes. Your prescriber will review your progress regularly and adjust or discontinue based on your individual response and health goals.
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.