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 15mg Price and Cost in the UK
Mounjaro (tirzepatide) 15mg is the maximum dose available in the UK, and cost varies significantly depending on whether you access it through the NHS or privately. If you're considering this prescription weight loss injection, understanding the pricing structure and access routes will help you make an informed decision. This guide covers UK pricing, availability, and how the prescription process works.
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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 Prescription Costs for Mounjaro 15mg in the UK
Private prescription costs for Mounjaro 15mg typically range from £180 to £320 per month, depending on your prescriber and the pharmacy dispensing your prescription. A single KwikPen contains 4 weekly injections (4 weeks supply), so monthly costs represent one pen per month once you've reached the 15mg maintenance dose.
The price you pay covers: the prescription consultation with a UK-licensed prescriber, clinical assessment, ongoing follow-up reviews, and the medication itself dispensed by a GPhC-registered pharmacy. Some providers include additional support such as lifestyle guidance or dietary resources.
- Lower doses (2.5mg–5mg) typically cost £129–£180 per month
- Mid-range doses (7.5mg–10mg) typically cost £150–£220 per month
- Maximum dose (15mg) typically costs £220–£320 per month
Private prescription tirzepatide is available without waiting lists, and you can often receive your first dose within 1–2 weeks of your initial consultation. The online assessment process is straightforward and conducted by UK-licensed prescribers who assess your suitability based on your health history and BMI.
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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.
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NHS Access vs Private Routes for Mounjaro in the UK
NHS access to Mounjaro is free once prescribed, but availability is limited and varies by region. NICE has approved tirzepatide for use within specialist tier 3 and tier 4 weight management services, meaning you must be referred by your GP to a dedicated NHS weight management service in your area. Waiting lists for NHS specialist services can be several months to over a year in many regions.
The private route bypasses NHS waiting lists entirely. You complete an online consultation with a UK-licensed prescriber, receive a prescription if appropriate, and collect your medication from a GPhC-registered pharmacy. This process typically takes 1–2 weeks start to finish. Use our free GLP-1 weight loss calculator to estimate potential outcomes, and our BMI calculator to check your personal BMI context before your consultation.
- 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 15mg cost per month on the NHS?
Mounjaro is free once prescribed through the NHS, but it's only available through specialist tier 3/tier 4 weight management services following GP referral. However, NHS access is extremely limited and waiting times can exceed 12 months in many regions. Your GP will discuss whether referral is appropriate based on your BMI and health conditions.
Can I get a private Mounjaro prescription quickly?
Yes. Private prescriptions are typically arranged within 1–2 weeks. You complete an online consultation with a UK-licensed prescriber, and if approved, your prescription is sent to a GPhC-registered pharmacy. Your first KwikPen is usually dispatched within days, and you can start your initial 2.5mg dose immediately.
Is private Mounjaro prescription cost included in the monthly price?
Yes. Private prescription costs (typically £220–£320/month for 15mg) include the prescriber consultation, clinical assessment, repeat prescription reviews, and the medication itself. Additional services like lifestyle support or diet guidance may be included depending on your provider.
What's the difference between NHS and private Mounjaro prescribing?
NHS prescriptions are free but require GP referral to specialist services and often involve long waiting lists. Private prescriptions cost £180–£320/month but are available immediately without NHS referral. Both require a licensed prescriber assessment; private prescribing is faster but costs you directly.
Can I switch from private Mounjaro to NHS later?
Potentially, yes. If you begin on private prescription and later access an NHS specialist weight management service, your prescriber may be able to transition you to NHS prescribing. However, this depends on NHS tier 3/4 service capacity in your region. Discuss this possibility with your GP or private prescriber.
Ready to take control of your weight loss journey?
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