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 15 Mg Price in the UK
Mounjaro (tirzepatide) 15 mg is the maximum prescribed dose of this GIP and GLP-1 receptor agonist injection for weight management in the UK. The cost varies significantly depending on whether you access it through the NHS or privately. This guide explains UK pricing, what affects the cost, and how to access Mounjaro at different dose levels.
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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.
How Much Does Mounjaro 15 Mg Cost in the UK?
Private sector pricing for Mounjaro 15 mg typically ranges from £200 to £320 per month, depending on the pharmacy and prescriber. Each KwikPen contains four weekly injections. Costs can vary based on consultation fees, delivery charges, and whether repeat prescriptions attract discounts. NHS access is available through specialist tier 3 or tier 4 weight management services, but availability varies significantly by region and local integrated care boards (ICBs). Many areas have substantial waiting lists — in some regions, NHS access can take months or longer. The 15 mg dose is typically only reached after gradual dose titration, meaning you would start at 2.5 mg and increase by 2.5 mg increments every 4 weeks, so treatment costs accumulate over several months before reaching maximum dose.
- Private monthly cost: approximately £200–£320 depending on provider
- NHS access: free if prescribed through specialist services, but regional availability varies
- Dose escalation: requires 4 weeks at each dose level before increasing
- Repeat prescriptions: may be cheaper than initial consultation and prescription combined
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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.
What Affects Mounjaro 15 Mg Pricing?
Several factors influence the final cost you pay for Mounjaro. Initial consultation fees (typically £50–£100) are sometimes separate from the medication cost. Pharmacy location and brand matter — different GPhC-registered online pharmacies set different prices. Delivery charges vary (some offer free delivery, others charge £5–£10). Bulk purchasing or repeat prescription discounts are sometimes available. The dose level you're prescribed also affects total monthly cost — starting doses (2.5–5 mg) may cost slightly less than maximum doses (15 mg), though price differences between doses are often minimal. Using our free BMI calculator can help you understand your current weight category and discuss eligibility with a prescriber, which is the first step toward accessing Mounjaro.
- 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 15 mg covered by the NHS in the UK?
Mounjaro may be prescribed through NHS specialist weight management services (tier 3/4), in which case it's free. However, NHS availability varies greatly by region. Many areas have long waiting lists. Private prescription is available through online GPhC-registered pharmacies without NHS referral, at a cost of approximately £200–£320 per month depending on provider.
Why does Mounjaro cost more at higher doses?
Pricing between dose levels is often similar, but 15 mg (the maximum dose) may cost slightly more than starting doses. More importantly, you must spend 4 weeks at each dose level (2.5, 5, 7.5, 10, 12.5 mg) before escalating, so reaching 15 mg takes approximately 20 weeks and accumulates total treatment costs over that period.
Can I get Mounjaro 15 mg without a prescription?
No. Mounjaro is prescription-only in the UK. It requires a clinical assessment by a UK-licensed prescriber before being prescribed. You cannot purchase Mounjaro without a valid prescription, whether through NHS or private routes.
What's the difference between starting Mounjaro and reaching 15 mg cost-wise?
The monthly cost at each dose level is roughly similar (£200–£320), but the total cost of treatment depends on how long you spend escalating through dose levels. Most people take 20+ weeks to reach 15 mg, paying approximately £1,000–£1,600 in total before reaching maximum dose.
How does Mounjaro 15 mg pricing compare to Wegovy?
Mounjaro and Wegovy (semaglutide) are typically priced similarly by UK private pharmacies (£200–£320 monthly). However, Wegovy has a lower maximum dose (2.4 mg) and may have different escalation timelines. Pricing between the two is often comparable, though individual pharmacy pricing varies.
Ready to take control of your weight loss journey?
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