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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Is 7.5mg Mounjaro Strong Compared to Wegovy?
Yes, 7.5mg Mounjaro is considered a moderate-to-strong dose in the titration schedule, but whether it's "strong" depends on individual response and how it compares to other weight loss injections. Mounjaro uses a dual GIP and GLP-1 mechanism, which differs from Wegovy's single GLP-1 approach. Both are prescription-only medications available in the UK following clinical assessment. Clinical trial data shows different efficacy profiles at different doses, and your GP or prescriber will assess which medication and dose suits your individual health needs. Understanding dose strength requires context from clinical evidence rather than dose number alone.
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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.
Mounjaro 7.5mg in Clinical Context and Trial Data
Mounjaro dose strength is assessed using the SURMOUNT-1 clinical trial data. At 7.5mg, Mounjaro is an escalation dose typically reached around weeks 9–12 of treatment. The trial showed participants on 10mg and 15mg (higher doses) achieved approximately 19.5% and 20.9% average body weight loss respectively, while lower doses showed lesser average reductions. However, 7.5mg represents the midpoint in the dose titration schedule, and individual response varies significantly. The dual GIP+GLP-1 mechanism of Mounjaro may produce different effects than Wegovy's single GLP-1 agonist action. For comparison, Wegovy reaches its maximum maintenance dose of 2.4mg around week 17, with clinical trial results showing approximately 14.9% average body weight loss at that dose. Both medications require a reduced-calorie diet and increased physical activity for optimal results, and dose strength alone does not assures outcomes.
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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.
Deciding Between Mounjaro 7.5mg and Wegovy — Prescriber Assessment
Choosing between Mounjaro at 7.5mg (or any dose) and Wegovy is not about which is "stronger" but which is clinically appropriate for your individual health profile. Your prescriber will assess factors including your current weight, BMI, any weight-related health conditions, and how you've responded to treatment so far. Both medications are prescription-only and licensed in the UK for weight management in adults with BMI ≥30 or BMI ≥27 with comorbidities. Access is through NHS specialist tier 3 services or private online prescribing following clinical assessment. Use our free GLP-1 weight loss calculator to explore potential weight loss projections at different doses, and discuss personalized recommendations with your prescriber. Individual tolerability, side effects, and personal medical history ultimately determine the most suitable choice, not dose number alone.
- 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 the same strength as any Wegovy dose?
No — they cannot be directly compared by dose number because they use different mechanisms. Mounjaro is a dual GIP+GLP-1 agonist, while Wegovy is a single GLP-1 agonist. Approximate clinical equivalence would suggest Mounjaro 7.5mg is similar to Wegovy 1–1.7mg in effect, but this is not an official conversion and individual response varies. Your prescriber determines the best option for you.
What percentage weight loss do people achieve on Mounjaro 7.5mg?
Clinical trial data (SURMOUNT-1) did not report specific outcomes for the 7.5mg dose alone. Average weight loss increased progressively with dose escalation: approximately 15% at 5mg, 19.5% at 10mg, and 20.9% at 15mg. Individual results at 7.5mg vary based on adherence, diet, activity, and personal metabolism. Always use conditional language — these are averages, not assures.
Why would a GP prescribe Mounjaro 7.5mg instead of a higher dose?
Dose escalation follows a structured schedule — patients start at 2.5mg and increase every 4 weeks. Staying at 7.5mg may indicate good tolerability and adequate response, or your prescriber may continue escalation based on individual assessment. Side effects, personal preference, and health status all influence dose decisions. Discuss your specific situation with your prescriber.
Can I switch from Mounjaro 7.5mg to Wegovy?
Yes, switching between medications is possible but requires prescriber guidance. There is no official established conversion chart — your prescriber will manage any transition carefully. Switching typically involves stopping one medication and starting another after an appropriate interval. Always consult your prescriber before making any medication changes.
Is Mounjaro available on the NHS at the 7.5mg dose?
NICE has approved tirzepatide (Mounjaro) for NHS use within specialist tier 3 weight management services. Availability and dose escalation protocols vary by region and ICB. Some areas have limited access or long waiting lists. Private prescription is available through GPhC-registered online pharmacies following clinical assessment. Check NHS England guidance for current regional availability.
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.