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 10 mg Mounjaro Cost in the UK?
The cost of 10 mg Mounjaro varies significantly depending on whether you access it through the NHS or a private prescription. On the NHS, tirzepatide (Mounjaro's generic name) is available through specialist weight management services, though availability and waiting times differ by region. Privately, a 10 mg dose typically costs between £180–£280 per month, though prices vary between providers. This guide explains UK pricing, what affects costs, and your options for access.
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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.
NHS vs Private Mounjaro Costs in the UK
NHS access: If prescribed through an NHS specialist tier 3 or tier 4 weight management service, Mounjaro is supplied at no charge once approved. However, NHS availability is limited and regional. Many areas have long waiting lists (sometimes 18 months or more), and not all ICBs (Integrated Care Boards) currently fund tirzepatide. You'll need a referral from your GP to a specialist service, and eligibility criteria must be met: BMI ≥30 kg/m², or BMI 27–29.9 with weight-related health conditions such as type 2 diabetes, hypertension, or sleep apnoea.
Private prescribing: Through a private consultation with a UK-licensed prescriber, a single 10 mg KwikPen typically costs £180–£280 depending on the provider. Each pen contains 4 weekly doses (one month's supply). Private access is faster—usually within days—and doesn't require NHS referral. You'll complete an online health assessment, and a prescriber will assess your eligibility before issuing a prescription to a GPhC-registered pharmacy.
What affects private costs: Pricing varies by clinic, pharmacy, and your dose tier. Starting doses (2.5 mg or 5 mg) are often cheaper than maintenance doses, and some providers offer loyalty discounts or package deals for multiple months.
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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.
Is 10 mg Mounjaro Worth the Cost?
Clinical trials showed that at 10 mg, participants lost an average of approximately 19.5% of body weight over 72 weeks, alongside a reduced-calorie diet and increased physical activity. Individual results vary significantly, and weight loss is not assured. Cost-effectiveness depends on your personal circumstances: if you're eligible for NHS access, there's no direct cost once approved. If paying privately, many people consider the investment worthwhile for faster access and professional support, especially if previous weight loss efforts have been unsuccessful.
When evaluating cost, consider that Mounjaro works best alongside lifestyle changes, not as a standalone treatment. Use our free GLP-1 weight loss calculator to estimate potential outcomes at your intended dose, and speak with a prescriber about whether 10 mg is the right dose for you—you may achieve good results at a lower dose like 7.5 mg, which could reduce costs.
- 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 a single 10 mg Mounjaro pen cost privately in the UK?
A single 10 mg KwikPen typically costs £180–£280 privately, depending on the provider and pharmacy. Each pen lasts 4 weeks (one month). Prices vary, so it's worth comparing between GPhC-registered online prescribing services. Some offer package discounts if you pay upfront for 3 or 6 months of treatment.
Will I have to pay for Mounjaro on the NHS?
No—if prescribed through an NHS specialist weight management service, Mounjaro is free. However, NHS availability is limited and regional, with some areas having significant waiting lists. You'll need a GP referral and must meet eligibility criteria (BMI ≥30, or ≥27 with weight-related health conditions).
Why is private Mounjaro more expensive than Wegovy?
Mounjaro is a newer dual GIP/GLP-1 agonist (vs Wegovy's single GLP-1 mechanism), and tirzepatide was initially in higher demand. Pricing reflects supply, manufacturer costs, and prescriber fees. As supply stabilises, prices may gradually fall. Compare both for your specific situation.
Does the cost of 10 mg Mounjaro include the clinical assessment?
This depends on the provider. Some online prescribing services bundle the consultation into their pricing; others charge separately (typically £20–£50 for the initial assessment). Always check the total cost upfront before purchasing, and ask whether follow-up reviews are included or charged additionally.
Is 10 mg the most cost-effective Mounjaro dose?
Not necessarily. Starting doses (2.5 mg or 5 mg) are cheaper and may be effective for many people. The dose is titrated over weeks—you may achieve good weight loss at 7.5 mg or 10 mg without needing the maximum 15 mg dose. A prescriber will recommend the appropriate dose for you, and you can calculate projected outcomes using our free weight loss calculator.
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.