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
Will The Price Of Mounjaro Go Down In The UK?
Mounjaro (tirzepatide) pricing in the UK is currently stable, but future costs depend on patent expiry, generic availability, and market competition. Unlike NHS medicines, private prescription weight loss treatments don't benefit from bulk purchasing negotiation. Both Mounjaro and Wegovy (semaglutide) are expensive at point of prescription, typically ranging from £150–£300 monthly depending on dose. Understanding pricing trends and how they compare can help you make informed decisions about weight management options. Use our free GLP-1 weight loss calculator to explore potential outcomes at different doses before committing financially.
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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 vs Wegovy: Current UK Pricing & Cost Factors
Current UK private pricing: Both Mounjaro and Wegovy are available through private prescription in the UK, with costs varying significantly by provider and dose tier. Mounjaro (tirzepatide) typically costs £129–£320 monthly depending on the mg dose (starting at 2.5 mg up to 15 mg). Wegovy (semaglutide) pricing is usually £150–£300 monthly for doses up to 2.4 mg. These prices reflect current market competition and supply costs. Neither medication is routinely available on the NHS except through specialist tier 3 weight management services, which have limited availability.
What affects pricing: GLP-1 and GIP/GLP-1 medication costs are influenced by manufacturing complexity, patent protection (Mounjaro has stronger patent protection through 2030+), cold chain storage requirements, and the need for clinical assessment before dispensing. Generic versions of semaglutide won't be available until 2030 at earliest, and tirzepatide generics are even further away. Competition between providers may gradually reduce private prices, but NHS prices (where available) are set separately.
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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.
Patent Expiry, Generics & Future Price Trends
When might prices fall? Semaglutide (Wegovy brand name) patent expires around 2030–2032 in most markets, which could allow generic alternatives and reduce costs. Tirzepatide (Mounjaro) has stronger patent protection extending beyond 2032, meaning private Mounjaro costs may remain higher longer. Patent expiry typically results in 40–60% price reductions as generics enter the market, though this varies by region.
Current trends: Increased competition between UK online prescribing services has created modest downward pressure on private prices. NHS commissioning guidance for tirzepatide (Mounjaro) and semaglutide (Wegovy) through specialist services may improve accessibility for eligible adults with BMI ≥30 or BMI 27–29.9 with weight-related health conditions. Individual prescriber decisions determine suitability regardless of cost—both medications require clinical assessment before dispensing. Track your progress with our free progress tracker once treatment begins.
- 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 than Wegovy in the UK?
Currently, pricing is similar (Mounjaro £129–£320/month, Wegovy £150–£300/month) depending on dose and provider. Both are expensive private prescriptions. Direct price comparison depends on your specific dose and which online provider you use. Neither is routinely on the NHS.
Will Mounjaro prices drop when the patent expires?
Yes, likely 40–60% reduction once generics become available around 2032–2033, but tirzepatide's patent is stronger than semaglutide's. Semaglutide generics may arrive around 2030–2032, potentially allowing Wegovy prices to fall first.
Can I get Mounjaro on the NHS to avoid private costs?
Limited NHS access exists through specialist tier 3 weight management services for adults meeting criteria (BMI ≥30 or BMI 27–29.9 with comorbidities). Regional availability varies significantly; most people currently access through private prescription with clinical assessment.
What's the difference between Mounjaro and Wegovy pricing factors?
Mounjaro (tirzepatide dual GIP+GLP-1) has longer patent protection, potentially keeping private prices higher. Wegovy (semaglutide GLP-1 only) may see cost reductions sooner after generic availability. Both require prescriber assessment regardless of cost, and individual suitability determines eligibility.
Should I wait for prices to drop before starting weight loss treatment?
That's a personal decision. If you're eligible and your GP or prescriber assesses you as suitable, delaying treatment means delaying potential health benefits. Patent expiry is years away. Use our GLP-1 weight loss calculator and BMI calculator to understand your individual context before deciding.
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.