The UK's most complete GLP-1 guide
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- 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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7.5mg Mounjaro vs Wegovy — UK Cost and Effectiveness Comparison
If you're looking for the cheapest 7.5mg Mounjaro option in the UK, it's important to understand how it compares to Wegovy—the main alternative GLP-1 weight loss injection. Both are prescription-only medications that may support weight management when used alongside diet and exercise, but they work differently, cost differently, and suit different people. This guide explains the key differences, clinical trial data, and how to find the most affordable option through a clinical assessment.
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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.
Clinical Trial Results and Mechanism Differences
Mounjaro (tirzepatide) at 7.5mg uses a dual GIP and GLP-1 receptor agonist mechanism—activating two natural hormone pathways to regulate appetite and support feeling fuller after meals. In the SURMOUNT-1 clinical trial, participants at the 7.5mg dose achieved average weight loss of approximately 19.5% of body weight over 72 weeks, alongside reduced-calorie diet and increased physical activity.
Wegovy (semaglutide) uses a single GLP-1 receptor agonist mechanism. In the STEP-1 clinical trial, participants achieved average weight loss of approximately 14.9% of body weight at the maximum 2.4mg dose over 68 weeks—also with diet and exercise support.
- Mounjaro's dual mechanism may offer slightly higher average weight loss in clinical trials
- Individual results vary significantly—some people respond better to one medication than the other
- Both require a mounjaro kwikpen or similar injection device for once-weekly dosing
- A prescriber will assess which mechanism suits your individual health profile
Neither medication assures specific outcomes—trial data represents averages, and personal results depend on adherence, lifestyle changes, and individual metabolism.
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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.
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Cost, Eligibility, and How to Access the Cheapest Option
Cost in the UK: Private Mounjaro 7.5mg typically costs £200–£300 per month depending on the provider, while Wegovy at comparable doses ranges from £150–£250 per month. Prices vary significantly across private prescribing services. NHS access is available through tier 3 specialist weight management services, but eligibility and waiting times vary by region and ICB funding. For mounjaro nhs nice approval, referral through your GP to a specialist service is required—this route is free but may involve waiting lists.
Eligibility: Both medications require BMI ≥30 (or ≥27 with weight-related health conditions like type 2 diabetes, hypertension, or sleep apnoea). A UK-licensed prescriber will assess your mounjaro uk prescription eligibility and suitability based on your full medical history. Neither medication is suitable if you're pregnant, planning pregnancy, or have a personal or family history of medullary thyroid cancer.
To find the cheapest 7.5mg Mounjaro option, compare costs across registered online pharmacies following an online clinical assessment. Use our free GLP-1 weight loss calculator to estimate potential results at this dose, and our BMI calculator to check your current health baseline before consulting a prescriber.
- 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 7.5mg Mounjaro cheaper than Wegovy in the UK?
Private prices overlap—Mounjaro 7.5mg typically costs £200–£300/month, while Wegovy ranges £150–£250/month. Costs vary by provider and dose. For NHS access, both are free if prescribed through specialist services, but waiting times and regional availability differ significantly. Always compare current prices across registered GPhC pharmacies.
What's the difference between Mounjaro and Wegovy mechanisms?
Mounjaro is a dual GIP and GLP-1 receptor agonist (tirzepatide), activating two appetite-regulating pathways. Wegovy is a single GLP-1 receptor agonist (semaglutide). Clinical trials suggest Mounjaro may produce slightly higher average weight loss, but individual responses vary considerably. Your prescriber will assess which mechanism suits you best.
Which medication requires fewer injections?
Both are once-weekly injections. Mounjaro comes as a kwikpen with 4 weeks' supply per pen. Wegovy also uses once-weekly injection pens. Neither requires daily dosing, making both convenient for long-term use if prescribed.
How do I access the cheapest Mounjaro 7.5mg in the UK?
Private access is typically through online consultations with UK-licensed prescribers, dispensed by GPhC-registered pharmacies—prices range £200–£300/month. NHS access is free through specialist weight management services (tier 3) with a GP referral, though waiting lists vary by region. Compare registered providers for current pricing.
Will 7.5mg Mounjaro help me lose weight faster than Wegovy?
Clinical trials showed Mounjaro achieved higher average weight loss (~19.5% at 7.5mg) than Wegovy (~14.9% maximum dose), but individual results vary significantly based on adherence, lifestyle, and personal metabolism. Neither assures outcomes. Results depend on combining the injection with reduced-calorie diet and increased physical activity alongside dose titration under prescriber guidance.
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.