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 Prices in the UK — Cost and Access Guide
Mounjaro (tirzepatide) pricing in the UK varies significantly depending on whether you access it through the NHS or privately. Private prescription costs typically range from £129 to £320+ per month depending on your dose and provider, whilst NHS access is free at the point of use but involves waiting times and regional variation. Understanding both routes helps you make an informed decision about accessing this weight loss injection in the UK.
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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 Costs in the UK
Private prescription pricing for Mounjaro KwikPen ranges from approximately £129 to £320 per month in the UK, depending on your dose level and the provider issuing the prescription. The starting dose of 2.5 mg costs less than higher maintenance doses — a typical first month may cost around £129–£180, whilst the maximum 15 mg dose typically costs £280–£320 per month. Each KwikPen contains four weekly doses, so your monthly cost depends on which dose your prescriber assigns you. Private tirzepatide pricing also varies between different GPhC-registered online prescription services, so comparing providers can help you find better value. Important factors affecting cost include: whether you're starting at a low dose (cheaper initially) or jumping straight to a higher maintenance dose; delivery charges if any; and whether the provider offers repeat prescription discounts.
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 Route
NHS access to Mounjaro is free but limited to specialist tier 3 weight management services, typically accessed via GP referral. Waiting times vary significantly by region — some areas have waits of 6–18 months, whilst other regions may have shorter delays or temporary pauses due to demand. Private access via online consultation is faster: you can obtain a prescription within 24–48 hours if clinically appropriate, without waiting for NHS referral. The private route involves an online assessment with a UK-licensed prescriber (costing £10–£50 for consultation), followed by prescription dispensing. Private access is best for those unable to wait for NHS services or who fall outside local eligibility criteria.
- 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.
What's included in the Mounjaro price on the NHS?
NHS Mounjaro is completely free at point of use, including the injection pens, clinical monitoring, and regular prescriber reviews. You pay nothing regardless of the dose you're prescribed. However, availability depends on your local NHS integrated care board and specialist weight management service capacity.
Do Mounjaro prices in the UK include delivery?
Private provider pricing typically includes delivery to your home address, but some services may charge separately. Check the terms when comparing providers. NHS prescriptions are dispensed by hospital or specialist services directly, so delivery is not applicable.
Why does Mounjaro cost more at higher doses?
Higher doses (10–15 mg) contain more active tirzepatide and require more complex manufacturing. Starting doses like 2.5 mg are the cheapest; costs increase progressively as you escalate through 5 mg, 7.5 mg, 10 mg, 12.5 mg, and finally 15 mg over weeks.
Can I use my BMI to determine if I'm eligible for NHS Mounjaro?
Your BMI is one factor. NHS eligibility requires a BMI of 30+ or 27–29.9 with weight-related health conditions like type 2 diabetes. Use our free BMI calculator above to find your current BMI, then discuss eligibility with your GP who can refer you to specialist services.
Does the private prescription route require a clinical assessment?
Yes. All prescription Mounjaro — private or NHS — requires an online or in-person clinical assessment by a UK-licensed prescriber. They'll review your medical history, current medications, and health conditions to confirm suitability before issuing a prescription.
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.