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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Will Mounjaro Go Down In Price In The UK?
Mounjaro (tirzepatide) pricing in the UK remains relatively stable, though costs may vary between private prescribers and NHS access routes. Unlike some newly launched medications, Mounjaro pricing has not shown significant downward trends since its UK approval for weight management. Both Mounjaro and Wegovy (semaglutide) are prescription-only medicines, and pricing depends on your dose, where you obtain your prescription, and whether you access treatment through the NHS or privately. Understanding the factors that influence price can help you make informed decisions about weight management options.
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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 — Pricing And Cost Comparison
Mounjaro (tirzepatide) typically costs between £129–£320 per month privately in the UK, depending on your dose. The starting dose (2.5 mg) is often cheaper than the maximum maintenance dose (15 mg). Wegovy (semaglutide) costs similarly, ranging from approximately £130–£290 monthly at private prescribers, though pricing can vary.
Both medications are available through NHS specialist weight management services, though NHS access is geographically limited and often involves significant waiting lists. Private access through GPhC-registered online pharmacies following clinical assessment is usually more readily available. The KwikPen format of Mounjaro contains four weekly doses, while pricing reflects the specific dose strength you require. Unlike some established medications, both tirzepatide and semaglutide have maintained relatively consistent pricing since their weight management approvals. Future price reductions depend on factors including patent expiry, generic alternatives becoming available, and market competition—typically years away.
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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.
Which Medication Is Right For You — Clinical Factors Beyond Price
Choosing between Mounjaro and Wegovy should not be based solely on cost—your GP or prescriber will assess your individual suitability based on your health profile, BMI, and any weight-related conditions you may have. Mounjaro is a dual GIP and GLP-1 receptor agonist, while Wegovy is a GLP-1-only medication; clinical trial data (SURMOUNT for Mounjaro, STEP trials for Wegovy) showed different average weight loss outcomes, though individual results vary significantly.
Both require dose titration over several weeks, and both work best alongside reduced-calorie diet and increased physical activity. If cost is a concern, discuss this openly with your prescriber—they may recommend starting at a lower dose or exploring NHS specialist services in your area. Use our free GLP-1 weight loss calculator to estimate potential outcomes at different doses, and our BMI calculator to understand your current health context before your consultation.
- 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?
Pricing is similar between both medications, typically £129–£320 monthly for Mounjaro and £130–£290 for Wegovy depending on dose and prescriber. Costs vary by private clinic; NHS access is free but availability is limited and waiting lists can be lengthy in many regions.
Will Mounjaro price drop in the UK in the future?
Significant price reductions are unlikely in the near term, as Mounjaro remains under patent protection. Prices may eventually decline following patent expiry or generic alternatives becoming available—typically years in the future. Current pricing has remained relatively stable since UK approval.
What's the difference between Mounjaro and Wegovy in terms of cost?
Both cost similarly per month through private prescribers. The main differences are the medication mechanisms—Mounjaro is dual GIP+GLP-1 while Wegovy is GLP-1 only—and average weight loss outcomes in clinical trials. Choice should be based on clinical suitability, not cost alone.
Can I get Mounjaro on the NHS to save money?
Yes, Mounjaro is available through NHS specialist tier 3 weight management services, but access is geographically variable and waiting lists can be very long (months to over a year in some areas). Your GP can refer you to your local service, or private access may be faster if cost is manageable.
Which dose of Mounjaro is most cost-effective?
Starting doses (2.5 mg) are typically cheaper than maximum doses (15 mg). Your prescriber will gradually increase your dose over weeks based on your response and tolerability. Discuss cost concerns with your prescriber—they can advise on dose options that balance effectiveness and affordability for your situation.
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.