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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What are the current Mounjaro prices in the UK?
Mounjaro pricing in the UK varies significantly depending on whether you access it through the NHS or privately. There is no single "new price" — costs depend on your dose, provider, and whether treatment is covered by specialist services. This guide explains current UK pricing, what influences costs, and how to access Mounjaro affordably. Always consult your GP or a qualified prescriber to discuss your options and eligibility.
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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.
Current Mounjaro Pricing in the UK
NHS access: If prescribed through an NHS specialist weight management service (tier 3), Mounjaro is typically available at no cost beyond your standard NHS prescription charge (currently £9.90 per item in England, or free if you qualify for exemptions). However, NHS access is limited and varies significantly by region — many areas have restricted availability or long waiting lists.
Private access: Through private prescribers and GPhC-registered pharmacies, Mounjaro costs typically range from £120 to £320 per month, depending on your starting dose. The tirzepatide KwikPen (4 weeks supply) price varies by provider:
- 2.5 mg pen (starting dose): approximately £120–£150
- 5 mg pen: approximately £150–£180
- 10 mg pen: approximately £200–£250
- 15 mg pen (maximum dose): approximately £280–£320
Prices may change and vary between providers — always compare costs before committing to treatment.
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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 Costs?
Several factors influence Mounjaro pricing:
- Dose: Higher doses cost more — you start at 2.5 mg and titrate upwards over weeks, so your monthly cost increases as you progress through the dose escalation schedule.
- Provider: Private prescribers and pharmacies set their own prices — costs vary between providers, so it's worth comparing.
- Prescription frequency: Each KwikPen contains 4 weekly doses. If you're on a lower dose, you may use less per month, but you still pay for the full pen.
- Bulk purchasing: Some providers offer discounts if you commit to multiple pens or longer treatment periods.
Use our free GLP-1 weight loss calculator to estimate potential outcomes at different doses — this can help you understand the cost-benefit of dose escalation.
- 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.
Will Mounjaro prices change in 2024 or 2025?
Medication pricing is regularly reviewed by manufacturers and providers. Private prices may fluctuate based on demand, supply, and provider costs. NHS pricing is determined by NICE guidelines and commissioning decisions. It's best to check current prices with your prescriber, as costs can change throughout the year.
Is Mounjaro cheaper on the NHS than privately?
Yes — NHS access costs only the standard prescription charge (£9.90 in England), making it far cheaper than private treatment (£120–£320/month). However, NHS availability is limited, and waiting times can be several months or longer. Private access is faster but significantly more expensive.
How do Mounjaro costs compare to Wegovy?
Wegovy prices are broadly similar to Mounjaro (£120–£280/month depending on dose), though exact costs vary by provider. Both require prescription-only assessment. Costs are typically lower on the NHS for both, though availability differs by region. Compare options with your prescriber.
Can I reduce costs by staying on a lower Mounjaro dose?
Staying on a lower dose costs less upfront, but your prescriber will recommend dose escalation based on your response and health needs — this is how the medication works best. Lower doses may be less effective. Discuss cost concerns with your prescriber; they can advise on optimal dosing for your situation.
Where can I find the most up-to-date Mounjaro pricing?
Contact your GP for NHS availability and pricing in your area, or check with GPhC-registered private prescribers and pharmacies directly for current private prices. Prices vary, so comparing multiple providers is recommended before starting treatment.
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.