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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Does A Higher Dose Of Mounjaro Work Better?
A higher dose of Mounjaro (tirzepatide) doesn't necessarily mean faster or better weight loss — it depends on your individual response and health needs. Clinical trials show that dose escalation helps some people, but results vary significantly. The choice between higher Mounjaro doses, standard doses, or even Wegovy is determined by your prescriber following a clinical assessment, not by dose alone. Let's look at what the evidence actually shows.
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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 Dose Escalation And Clinical Trial Results
Clinical trial data (SURMOUNT-1) shows a dose-response relationship, but with important context:
- Mounjaro 5 mg: approximately 15% average body weight loss
- Mounjaro 10 mg: approximately 19.5% average body weight loss
- Mounjaro 15 mg (maximum): approximately 20.9% average body weight loss
This suggests higher doses may offer slightly more weight loss on average — but individual results vary widely. Some people achieve excellent results on lower maintenance doses and experience significant side effects at higher doses. Others see minimal additional benefit from escalation beyond 10 mg. The dose titration schedule (advancing every 4 weeks, starting at 2.5 mg) is designed to find your optimal balance between efficacy and tolerability. Your prescriber will assess whether further escalation is appropriate for you based on your response, not on a predetermined target dose.
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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.
Mounjaro Versus Wegovy — Mechanism And Dose Comparison
Mounjaro and Wegovy work differently despite both being weight loss injections. Mounjaro is a dual GIP + GLP-1 receptor agonist (tirzepatide), while Wegovy is a single GLP-1 agonist (semaglutide). This dual mechanism may explain why Mounjaro shows slightly higher average weight loss in trials compared to Wegovy, even at maximum doses. However, "better" doesn't mean "right for you" — your prescriber will assess your individual health profile, any weight-related conditions, medical history, and medication interactions to recommend the most suitable option. Both require a UK prescription and clinical assessment. Use our GLP-1 weight loss calculator to understand projected outcomes at different doses, then discuss findings with your 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.
Will taking the maximum Mounjaro dose assures the best weight loss?
No. Clinical trials show 15 mg offers slightly higher average weight loss than lower doses, but individual responses vary dramatically. Some people achieve optimal results on 5–10 mg and experience unmanageable side effects at higher doses. Your prescriber will find your optimal dose — it's not about reaching the maximum, it's about finding what works safely and sustainably for you.
Is Mounjaro more effective than Wegovy if you take a higher dose?
Clinical trials suggest Mounjaro achieves slightly higher average weight loss (~21% vs ~15%), likely because it targets two hormone pathways rather than one. However, this isn't assured for every individual. Some people respond better to Wegovy. Your prescriber will assess which is more suitable based on your health profile and previous medication responses.
What happens if I skip a Mounjaro dose escalation?
You can stay on your current maintenance dose indefinitely if it's working well and side effects are manageable. Dose escalation is optional — not mandatory. If 10 mg provides good weight loss with acceptable side effects, there's no clinical requirement to increase to 15 mg. Your prescriber will advise based on your goals and tolerability.
How long does it take to see weight loss at higher Mounjaro doses?
Weight loss typically becomes apparent within 4–8 weeks of starting, and continues through the dose titration schedule. It can take 12–16 weeks to reach your target maintenance dose. Results are gradual and sustainable — expect steady loss rather than rapid drops. Clinical trials measured outcomes at 72 weeks to reflect realistic, long-term results.
Can I request a higher Mounjaro dose than my prescriber recommends?
Dose decisions are made by your prescriber following clinical assessment and UK licensing guidelines. Requesting a higher dose isn't recommended — your prescriber will titrate based on your individual response, side effects, and health conditions. If you're not seeing results on your current dose, discuss this with your prescriber rather than self-escalating.
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.