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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Mounjaro Bundle Deals vs Wegovy — What's the Difference?
If you're looking at Mounjaro bundle deals and considering how it compares to Wegovy, it's important to understand that both are prescription-only weight management injections available in the UK. The choice between them isn't about pricing alone — it depends on how your body responds, your medical history, and your prescriber's recommendation. Both require a clinical assessment before prescription, and individual results vary significantly. Our GLP-1 weight loss calculator can help you explore potential outcomes with either medication alongside your health profile.
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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.
Mechanism, Trial Data, and Dose Differences
Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist, meaning it activates two hormone pathways to regulate appetite and blood sugar. Clinical SURMOUNT-1 trial data showed average weight loss of around 15–21% of body weight at maximum dose (15 mg weekly). Wegovy (semaglutide) is a GLP-1-only agonist with STEP trial data showing approximately 14.9% average weight loss at maximum dose (2.4 mg weekly).
- Mounjaro dosing: 2.5 mg starting dose, increased weekly to a maximum of 15 mg over 20 weeks
- Wegovy dosing: 0.25 mg starting dose, escalated to a maximum of 2.4 mg over 16+ weeks
- Both are injected once weekly using pre-filled pens
- Both require a reduced-calorie diet and increased physical activity to achieve results
- Side effect profiles are similar (nausea, diarrhoea, constipation, stomach pain most common)
The clinical evidence suggests Mounjaro may have a slightly higher average weight loss in trials, but this does not assures superior outcomes for every individual. Your body's response is unique.
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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.
Eligibility, Assessment, and Individual Suitability
Both medications are available to UK adults with a BMI of 30 or above, or 27–29.9 with weight-related health conditions (such as type 2 diabetes, high blood pressure, or sleep apnoea). Your prescriber will assess you individually to determine which is more suitable based on your medical history, other medications, and personal preferences.
Neither drug assures specific weight loss amounts. Factors affecting outcome include adherence to dose escalation, diet quality, physical activity level, genetics, and metabolic health. Use the BMI calculator on this page to understand your starting point, and discuss with your prescriber which medication aligns with your health profile. Some people respond better to one mechanism than the other — this is determined through clinical assessment and monitoring, not through bundle deal pricing.
- 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 bundle deals?
Pricing for both medications varies between private UK prescribers and changes regularly. Bundle deals may offer slight savings on multiple pens or month-long supplies, but individual prices differ. Prescriber choice, not price, should be your primary factor — your GP or licensed prescriber will recommend the medication most suited to your health profile and medical history.
What's the main difference between Mounjaro and Wegovy?
Mounjaro is a dual GIP and GLP-1 agonist (activating two hormone pathways), while Wegovy is a GLP-1-only agonist. SURMOUNT trial data showed Mounjaro users lost an average of 15–21% body weight; STEP trial data for Wegovy showed approximately 14.9%. Both work best alongside diet and exercise changes.
Can I switch between Mounjaro and Wegovy?
Switching between medications requires prescriber guidance. An approximate equivalence exists (Mounjaro 5 mg ≈ Wegovy 0.5 mg; Mounjaro 15 mg ≈ Wegovy 2.4 mg), but any change must be managed clinically. Your prescriber will assess whether switching is appropriate and how to manage the transition safely.
How do I know which medication is right for me?
Your prescriber will assess your eligibility, medical conditions, other medications, and personal health goals. Both require BMI ≥30 or BMI 27–29.9 with weight-related health conditions. Neither is "better" universally — individual response varies. A clinical assessment is essential before any prescription.
Are Mounjaro bundle deals available through the NHS?
NHS access to both Mounjaro and Wegovy is through specialist tier 3 weight management services. Availability varies significantly by region and waiting lists can be lengthy. Private prescribing via GPhC-registered pharmacies offers faster access but involves upfront cost. Discuss options with your GP.
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.