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
Can You Use The Golden Dose Mounjaro?
The term "golden dose" refers to the 10mg Mounjaro dose, which some users report offers optimal results with manageable side effects. However, there's no official "golden dose" — the right Mounjaro dose varies by individual. Your prescriber will assess your health, weight, and response to find the most effective dose for you through a process called dose titration. Everyone's journey with tirzepatide is different, and what works best depends on your personal circumstances and how your body responds to the medication.
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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.
Understanding Mounjaro Dose Titration
Mounjaro is a prescription-only dual GIP and GLP-1 receptor agonist licensed in the UK for weight management. Rather than jumping to a fixed dose, your prescriber will gradually increase your Mounjaro KwikPen dose over several weeks to find what works best for you.
- Week 1–4: Start at 2.5mg — allows your body to adjust and monitor initial side effects
- Week 5–8: Increase to 5mg if tolerated — typical maintenance dose for many users
- Week 9–12: Escalate to 7.5mg if needed for better results
- Week 13–16: Increase to 10mg — where many users report optimal balance of effectiveness and tolerability
- Week 17–20: Escalate to 12.5mg if required
- Week 21+: Maximum dose of 15mg available
The key principle is that minimum 4 weeks at each dose is required before increasing. This allows time to assess effectiveness and side effects before escalating further. Your GP or prescriber will decide when (or if) to increase based on your individual response.
Clinically BackedWeight Loss
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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.
Why The 10mg Dose Appeals To Users
The 10mg Mounjaro dose has gained informal popularity because clinical trial data shows it delivers significant weight loss — approximately 19.5% body weight on average in the SURMOUNT-1 trial — whilst many users report manageable side effects at this level.
However, this doesn't mean 10mg is the "golden dose" for everyone. Some people achieve excellent results at 5mg or 7.5mg with fewer side effects, whilst others need higher doses or find 10mg causes too much nausea or digestive disruption. Your prescriber will work with you to find your optimal dose. Use our free GLP-1 weight loss calculator to explore potential outcomes at different doses, and track your progress with our free progress tracker throughout your treatment journey.
- 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 10mg the best Mounjaro dose for everyone?
No. The 10mg dose works well for some people, but the best dose is individual. Your prescriber will titrate you gradually, starting at 2.5mg and increasing every 4 weeks based on your response. Some people do well at 5mg or 7.5mg; others need 12.5mg or 15mg. There's no universal "golden dose" — it's personalised to your health and tolerance.
What does "dose titration" mean?
Dose titration is the process of gradually increasing your Mounjaro dose over weeks or months. You start at the lowest dose (2.5mg) to allow your body to adjust, then increase every 4 weeks if tolerated. This approach minimises side effects and lets your prescriber find your optimal effective dose.
Can I jump straight to 10mg Mounjaro?
No. UK prescribing guidelines require starting at 2.5mg and increasing gradually every 4 weeks. This protects your safety and allows your body to adapt. Jumping to higher doses increases nausea, vomiting, and other side effects without additional benefit. Your prescriber will guide your escalation schedule.
What if 10mg Mounjaro causes too many side effects?
If you experience severe nausea, vomiting, or other side effects at any dose, discuss this with your prescriber immediately. You may stay at a lower dose (5mg or 7.5mg) if it's working well for you, or reduce the dose temporarily to allow adaptation. Never change your dose without prescriber guidance.
How does the 10mg Mounjaro dose compare to Wegovy?
At 10mg, Mounjaro (tirzepatide) is roughly equivalent to Wegovy's maximum 2.4mg dose in terms of weight loss effect. Both are once-weekly injections with similar average weight loss outcomes (15–21% for Mounjaro, approximately 15% for Wegovy), though individual results vary. Your prescriber will recommend the most suitable option based on your health profile.
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.