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
Free tracker included with every download this week
Understanding Mounjaro Price Increases in the UK
Mounjaro (tirzepatide) costs have risen significantly in recent years, reflecting global manufacturing and regulatory costs. In the UK, prices vary depending on whether you access Mounjaro through the NHS specialist weight management services or private prescription. Understanding the current pricing landscape, eligibility criteria, and available options can help you make an informed decision about whether this GIP and GLP-1 receptor agonist medication is right for your weight management journey. Our GLP-1 weight loss calculator can help you project potential outcomes alongside cost considerations.
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Calculate Your BMI Instantly
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 in the UK: Current Costs
Private prescription costs for Mounjaro in the UK typically range from £180 to £320 per month, depending on the dose and provider. Starting doses (2.5 mg) are usually at the lower end, with maintenance and maximum doses (15 mg) at the higher end. Each KwikPen contains four weekly doses and costs increase as you titrate upwards through dose escalation.
NHS access is through specialist tier 3 weight management services following GP referral. Where available, NHS prescriptions are significantly cheaper, though regional availability is extremely limited and waiting lists can extend many months. Tirzepatide was approved by NICE for NHS use within specialist services, but uptake remains inconsistent across ICBs.
- Private costs vary by dose and provider
- Starting dose (2.5 mg) generally cheapest
- Maximum dose (15 mg) highest cost
- NHS access limited to specialist services
- Monthly vs annual costs should factor in commitment length
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No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
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.
Why Has Mounjaro Become More Expensive?
Mounjaro price increases reflect multiple factors: increased global demand following weight loss medication awareness, manufacturing scaling costs, supply chain pressures, and patent protection supporting premium pricing. The medication contains dual GIP and GLP-1 receptor agonist technology, making it more complex to manufacture than single-mechanism alternatives like Wegovy (semaglutide). Currency fluctuations also impact UK pricing for medicines manufactured internationally. As tirzepatide supply stabilises and competing GLP-1 medications enter the market, some cost pressure may ease, though UK private prices remain substantially higher than NHS funding levels indicate the medication 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 Mounjaro cost privately in the UK?
Private Mounjaro costs typically range from £180 to £320 per month depending on dose. Starting dose (2.5 mg) costs around £180–£200, while maximum dose (15 mg) costs £280–£320. Prices vary between providers. Each KwikPen contains four weekly doses.
Is Mounjaro available on the NHS in the UK?
Yes, NICE approved tirzepatide for NHS use within specialist tier 3 weight management services. However, availability is extremely limited by region and dependent on individual ICB funding. Most NHS access requires GP referral and specialist assessment. Waiting lists are often very long.
Why is Mounjaro more expensive than Wegovy?
Mounjaro contains dual GIP and GLP-1 receptor agonist technology, making it more complex to manufacture than Wegovy (which has single GLP-1 mechanism). This complexity, combined with patent protection and high global demand, supports higher pricing. Average trial weight loss outcomes are also slightly higher with Mounjaro.
Will Mounjaro prices come down in the UK?
Prices may ease as supply stabilises and competition from generic tirzepatide (once patents expire) increases. Currently, patent protection and strong demand support premium UK pricing. NHS costs are significantly lower, suggesting future price reductions are possible but not assured.
Can I get Mounjaro on my GP prescription?
Most GPs cannot prescribe Mounjaro for weight management. Access is typically through NHS specialist tier 3 services (following referral) or private prescription via an online clinical assessment from a UK-licensed prescriber. Your GP can discuss which route suits your circumstances. ```
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.