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's the Cheapest Mounjaro Price in the UK?
Mounjaro (tirzepatide) pricing in the UK varies significantly depending on whether you access it through the NHS or private prescription routes. The cost of a mounjaro kwikpen typically ranges from £129 to £320 per month privately, depending on your dose and pharmacy. NHS access is free but availability is limited and regional. This guide compares Mounjaro costs, pricing across doses, and how it stacks up against Wegovy to help you understand your options for prescription weight loss in the UK.
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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.
Mounjaro Pricing: NHS vs Private Routes
NHS access: Mounjaro is free through the NHS, but only available via tier 3 specialist weight management services following a referral from your GP. Availability is highly regional, and waiting lists in many areas are substantial—sometimes 6–18 months. NHS access requires meeting specific BMI and health criteria and is not available through standard GP prescription.
Private access: Private prescription costs range from approximately £129–£320 per month depending on dose and provider. Prices are typically lowest at the starting dose (2.5 mg, around £129–£150/month) and increase as you titrate up. The maximum dose (15 mg) costs approximately £280–£320/month. Each KwikPen contains 4 weekly doses, so you'll need one pen per month. Private prescriptions are issued following an online clinical assessment by a UK-licensed prescriber—no NHS referral needed, and treatment can begin within days.
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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
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Mounjaro vs Wegovy: Cost & Efficacy Comparison
Price comparison: Mounjaro and Wegovy have similar pricing structures, both ranging £129–£320/month privately depending on dose. Wegovy typically costs slightly less at lower doses because its starting dose (0.25 mg) is lower than Mounjaro's (2.5 mg). However, pricing varies by pharmacy, so direct comparison is recommended.
Efficacy differences: Mounjaro is a dual GIP + GLP-1 receptor agonist, whilst Wegovy is a GLP-1 agonist only. In clinical trials, Mounjaro showed average weight loss of 15–21% of body weight, compared to approximately 15% for Wegovy. However, individual results vary considerably. A prescriber will assess which medication suits your individual health profile—cost alone shouldn't determine the choice. Try our free GLP-1 weight loss calculator to project potential outcomes at different doses.
- 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 cheaper on the NHS than privately?
Yes—Mounjaro is completely free through the NHS. However, NHS access is limited to specialist tier 3 weight management services with significant waiting lists. Private prescription typically costs £129–£320/month depending on dose. For many people, private access is faster despite the cost.
What's the price difference between Mounjaro doses?
Starting dose (2.5 mg) costs approximately £129–£150/month. Mid-range doses (5–10 mg) cost £180–£240/month. Maximum dose (15 mg) costs £280–£320/month. Prices vary by pharmacy—always compare before committing.
Why is Mounjaro more expensive than some weight loss injections?
Mounjaro is a newer dual-mechanism medication (GIP + GLP-1 agonist) rather than a single-mechanism injection. Manufacturing, licensing, and research costs are reflected in pricing. Liraglutide (Saxenda) may be cheaper but requires daily injections versus Mounjaro's once-weekly dosing.
Can I get Mounjaro on prescription through my GP?
Not typically as standard primary care. GPs can refer you to specialist NHS tier 3 services, but Mounjaro is not routinely prescribed in general practice. Private prescription is available through online clinical assessment without NHS referral. Your prescriber will assess eligibility based on BMI and health criteria.
How do I find the cheapest Mounjaro price?
Private pricing varies across GPhC-registered online pharmacies. Compare costs across providers before purchasing—prices range £129–£320/month for the same dose. Always ensure the pharmacy is UK-licensed and requires a clinical assessment. Your GLP-1 weight loss calculator can help project costs over time at different doses.
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.