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 Mounjaro Come Down In Price In The UK?
Mounjaro (tirzepatide) pricing in the UK is a common concern for people considering weight loss treatment. Currently, private Mounjaro prescriptions cost between £150–£300 per month depending on dose and provider, whilst Wegovy ranges from £129–£280. Prices may eventually decrease as competition increases and patents expire, but there's no assures. NHS access through specialist weight management services remains the most affordable option, though availability varies significantly by region. Understanding the current cost landscape and comparing both GLP-1 medications can help you make an informed decision about prescription weight loss treatment.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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 Pricing and Mechanism Differences
Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist developed by Eli Lilly, whilst Wegovy (semaglutide) is a single GLP-1 agonist manufactured by Novo Nordisk. This mechanism difference — not just pricing — influences both efficacy and side effect profiles. In the SURMOUNT clinical trials, Mounjaro showed average weight loss of approximately 15–21% of body weight, compared to Wegovy's STEP trial results of around 14.9%. Both are prescription-only medicines requiring clinical assessment before being prescribed.
Pricing varies by provider and dose. The Mounjaro KwikPen device delivers fixed doses (2.5 mg to 15 mg weekly), whilst Wegovy dosing ranges from 0.25 mg to 2.4 mg. Approximate private prescription costs in the UK are: Mounjaro £150–£300/month, Wegovy £129–£280/month. However, these figures vary between online prescribing services and pharmacy partners, so it's worth comparing providers if accessing treatment privately. Individual results vary significantly regardless of cost.
Clinically BackedWeight Loss
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.
NHS Access and Future Price Trends for Weight Loss Injections
The most cost-effective route to prescription weight loss treatment in the UK remains NHS specialist weight management services, where both Mounjaro and Wegovy are now available through tier 3 services in many regions — typically free at point of care for eligible patients. However, NHS waiting lists can be lengthy, and regional availability varies considerably.
Regarding future pricing, pharmaceutical patent expiration, increased competition, and generic tirzepatide development may eventually reduce costs — but no specific timeline exists. Use our free GLP-1 weight loss calculator to explore potential outcomes at different doses of either medication, helping you weigh cost against expected results. Your GP or prescriber can discuss both NHS and private options, ensuring you choose the most suitable and affordable pathway for your circumstances.
- 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, with Wegovy typically £129–£280/month and Mounjaro £150–£300/month depending on dose and provider. Costs vary between online pharmacies, so comparing providers is worthwhile. Individual results vary, so the "cheaper" option depends on efficacy for you personally.
Will Mounjaro price come down as Novo Nordisk's patent expires?
Novo Nordisk manufactures Wegovy, not Mounjaro. Mounjaro is made by Eli Lilly. Patent expiration and generic competition may eventually reduce tirzepatide costs, but no confirmed timeline exists. NHS access currently offers the lowest cost route.
Can I get Mounjaro on the NHS instead of paying privately?
Yes. NICE has approved tirzepatide for NHS specialist weight management services. Eligibility requires referral to a tier 3 service and meeting BMI/health condition criteria. NHS availability and waiting times vary significantly by region — ask your GP about local services.
Is Wegovy cheaper than Mounjaro because it's been available longer?
Both are similarly priced despite Wegovy's longer availability. Pricing reflects manufacturing costs, distribution, and competitive pressures rather than availability alone. The dose you require will influence your actual monthly cost more than the brand itself.
Should I choose Mounjaro or Wegovy based on price alone?
No. Both require clinical assessment to determine suitability based on your health profile, BMI, and medical history. Your prescriber will recommend the most appropriate medication. Cost should be considered alongside efficacy, side effects, and individual suitability — all of which vary person to person.
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.