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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Why Has Mounjaro Prices Increased in the UK?
Mounjaro (tirzepatide) prices have risen notably across the UK since its launch for weight management. Several factors drive these increases, including supply constraints, manufacturing costs, and currency fluctuations affecting imports. Understanding why this prescription-only weight management injection costs more helps you make informed decisions about your healthcare options. Whether you're exploring Mounjaro through NHS services or private prescription, knowing the cost drivers is essential context for your choice.
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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.
Key Reasons for Mounjaro Price Increases
Mounjaro pricing has increased due to several interconnected factors. Supply and demand imbalances have driven costs upward — global demand for GLP-1 and GIP/GLP-1 receptor agonists far exceeds current manufacturing capacity, and Eli Lilly (the manufacturer) has had to scale production significantly. Manufacturing complexity means tirzepatide production is expensive — it requires sophisticated pharmaceutical infrastructure and strict quality controls under MHRA supervision. Currency fluctuations also affect UK pricing, as the pound's strength against the US dollar influences import costs. Additionally, distribution and regulatory costs have risen as the medicine requires specialist handling and storage (2–8°C refrigeration until use). Private prescribers adjust pricing to reflect these increased supply costs, while NHS pricing is negotiated separately through NICE and regional frameworks.
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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.
Comparing Mounjaro Costs With Other Weight Management Options
When evaluating Mounjaro expenses, context matters. Mounjaro KwikPens (the pre-filled injection device) typically range from £150–£320+ monthly in private services depending on dose — though prices vary by provider. Other prescription alternatives exist: Wegovy (semaglutide, a GLP-1 agonist only) costs similarly; Saxenda (liraglutide) is a daily injection with different pricing. NHS access through specialist tier 3 weight management services avoids these private costs entirely, though waiting lists can be lengthy depending on your region. Using our GLP-1 weight loss calculator can help you explore projected outcomes with different doses and medications, supporting more informed cost-benefit decisions about which option suits your health goals and budget.
- 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 continue to rise in the UK?
Difficult to predict with certainty. If Eli Lilly expands manufacturing capacity, supply constraints may ease and pricing could stabilise. However, demand remains very high, and regulatory costs continue rising. Private providers adjust pricing based on their acquisition costs, so individual provider prices may vary independently.
Is Mounjaro cheaper on the NHS than private prescription?
Yes. NHS access through specialist weight management services avoids private prescription fees. However, NHS availability is limited and varies significantly by region (integrated care board). Waiting lists can be 6–18 months or longer in some areas. Private prescription is faster but costs £150–£320+ monthly depending on dose.
What's the difference between Mounjaro and Wegovy pricing?
Both typically cost £150–£320 monthly in private UK services, though exact prices vary by provider and dose. Mounjaro (tirzepatide, dual GIP/GLP-1 agonist) and Wegovy (semaglutide, GLP-1 agonist only) have similar cost ranges. Compare specific provider quotes directly, as pricing varies.
Why is Mounjaro more expensive than some other weight loss medications?
Mounjaro's complexity and manufacturing demands make it costlier to produce than some alternatives. It's a dual-action medication (GIP and GLP-1 agonist), requiring more sophisticated formulation. Supply constraints and limited production capacity also drive up acquisition costs for providers.
Can I get Mounjaro cheaper by buying abroad and importing to the UK?
Not legally. Mounjaro is a prescription-only medicine in the UK. Personal importation of prescription medications is illegal without a UK prescription. You must obtain a valid UK prescription from a licensed UK prescriber before purchase through any UK pharmacy.
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.