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 Get Cheaper in the UK?
Mounjaro (tirzepatide) pricing in the UK is a common concern for people considering weight management treatment. Currently, private prescription costs range from approximately £129 to £180 per month depending on dose and provider. Whether prices will decrease depends on several factors including patent expiry, NHS availability, and generic alternatives. This guide explains current UK costs, access routes, and what may affect pricing in future.
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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.
Current Mounjaro Costs and Pricing Factors in the UK
Private prescription costs: Mounjaro through private online prescribing services typically costs between £129 and £180 per month, depending on the dose you're prescribed. A single KwikPen (4-week supply) costs more at lower doses (2.5 mg and 5 mg) because you receive fewer injections per pen. Higher doses (10 mg, 15 mg) cost slightly less per injection but more overall.
- Starting dose (2.5 mg): approximately £129–£145/month
- Maintenance doses (5–10 mg): approximately £145–£165/month
- Maximum dose (15 mg): approximately £165–£180/month
What affects pricing: UK private pricing is influenced by manufacturer wholesale costs, pharmacy margins, and clinical assessment fees. Mounjaro is manufactured by Eli Lilly and Company, and tirzepatide remains under patent protection in the UK, meaning generic alternatives are not yet available. NICE has approved Mounjaro for NHS specialist weight management services, but NHS availability varies significantly by region and waiting lists can be lengthy.
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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.
Will Mounjaro Prices Fall? Future Pricing Outlook
Mounjaro prices may decrease over time due to several factors. Patent expiry: tirzepatide's UK patent protection is expected to extend until approximately 2030–2032, after which generic versions may become available at lower cost. Increased NHS availability: As more NHS weight management services gain funding and capacity, NHS prescription access may increase, potentially reducing private demand and costs.
However, prices may not drop significantly until genuine generic competition emerges. Our GLP-1 weight loss calculator can help you explore potential weight loss outcomes if you're considering Mounjaro, allowing you to weigh the investment against expected results. Currently, private costs are stable, and no major UK price reductions are anticipated in the near term. If cost is a concern, discuss NHS referral options with your GP, or explore whether other weight management approaches may suit your situation.
- 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 on the NHS in the UK?
Mounjaro is available through NHS specialist tier 3/4 weight management services at no cost to eligible patients. However, NHS access is restricted to specialist services (not standard GP prescription), requires referral, and availability varies significantly by region. Waiting lists can be lengthy in many areas. Private prescription costs apply only if using private online prescribing services.
Is Mounjaro cheaper than Wegovy in the UK?
Pricing is similar between Mounjaro and Wegovy through private prescribing services, typically £129–£180 per month depending on dose. Wegovy (semaglutide) costs slightly less at some providers due to different dosing schedules, but the difference is usually marginal. Both require a prescription and clinical assessment. Your GP or prescriber can advise which is most appropriate for you.
When will generic Mounjaro (tirzepatide) become cheaper?
Tirzepatide's UK patent protection is expected to expire around 2030–2032, after which generic versions may become available at lower cost. This could reduce prices significantly. Until then, Mounjaro remains a brand-name medication with stable pricing. If cost is prohibitive now, NHS referral or other weight management options may be worth exploring.
How can I access Mounjaro on the NHS instead of paying privately?
Ask your GP for referral to your local NHS tier 3 specialist weight management service. Eligibility includes BMI ≥30 or BMI 27–29.9 with weight-related health conditions. NHS services are free but have limited capacity and waiting lists. Availability varies by region. Contact your local NHS Integrated Care Board (ICB) to check whether Mounjaro is available in your area.
Are there cheaper weight loss options in the UK?
NHS tier 1 and 2 services offer free digital tools, behaviour change programmes, and community weight management support. The NHS Weight Loss Plan is free. Private weight loss injections (Mounjaro, Wegovy) cost £129–£180/month. Use our free BMI calculator and weight loss calculator to assess your baseline and explore what approach may suit your circumstances and budget.
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.