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
What Is the Mounjaro 'Golden Dose'?
The term "Mounjaro 'golden dose'" is sometimes used to describe the dose at which patients experience optimal weight loss results with Mounjaro (tirzepatide) — though there's no single universally agreed dose. In the UK, most patients reach their target dose between 10mg and 15mg weekly, but individual response varies significantly. Your GP or prescriber will assess what dose is right for you based on your personal health, weight loss progress, and tolerance to side effects. Understanding how Mounjaro dosing works can help you have informed conversations with your healthcare provider about your weight management treatment.
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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.
How Mounjaro Dosing Works in the UK
Mounjaro is a prescription-only GIP and GLP-1 receptor agonist that requires a personalised dose titration schedule. In the UK, treatment begins at 2.5mg weekly and increases every four weeks: 2.5mg (weeks 1–4), 5mg (weeks 5–8), 7.5mg (weeks 9–12), 10mg (weeks 13–16), 12.5mg (weeks 17–20), and finally 15mg (week 21 onwards).
The concept of a "golden dose" refers to the point where weight loss plateaus or where side effects outweigh benefits — this is individual. Clinical trials showed that patients on 15mg (the maximum dose) lost approximately 20.9% of body weight on average, but many patients achieve significant results at lower doses like 10mg or 12.5mg.
Your prescriber will assess your progress at each dose level and may pause escalation if you're experiencing manageable side effects or achieving satisfactory weight loss. This personalised approach means there's no one "clinically supported dose" for everyone — the right dose is the one that works for your body.
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
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.
NHS Access and Private Routes in the UK
In the UK, Mounjaro access depends on your route. Through NHS specialist weight management services (tier 3), NICE has approved tirzepatide, but availability varies by region and waiting lists can be long. Your GP can refer you to specialist services if you meet eligibility criteria: BMI 30 or above, or BMI 27–29.9 with weight-related health conditions like type 2 diabetes or hypertension.
Privately, Mounjaro is available through GPhC-registered online pharmacies following a clinical assessment with a UK-licensed prescriber. Private routes offer faster access without NHS referral waiting lists, though you'll pay for treatment directly. Whichever route you choose, use our free GLP-1 weight loss calculator to estimate potential results at different doses, and track your progress with our progress tracker as treatment progresses.
- 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.
What makes a Mounjaro dose 'golden'?
There's no official "golden dose" — it's informal terminology for the dose where you experience optimal weight loss with manageable side effects. For most patients this is 10–15mg weekly, but your ideal dose depends on your individual response, health conditions, and tolerance. Your prescriber will help determine the right dose for you through gradual escalation.
Is the 'golden dose' the same for everyone?
No. Clinical trials show average weight loss increases with higher doses, but individual results vary significantly due to genetics, metabolism, diet, and exercise. Some people lose substantial weight at 10mg, while others need 15mg or experience side effects that limit escalation. Your prescriber personalises your dose based on your progress and response.
Can I stay on a lower Mounjaro dose if it's working?
Yes. If you're losing weight steadily and tolerating your current dose well, your prescriber may not escalate you to the maximum 15mg. The goal is effective, sustainable weight loss with side effects you can manage — not reaching the highest dose for its own sake.
How long does it take to reach the 'golden dose'?
Mounjaro dose escalation takes approximately 20 weeks to reach 15mg (the maximum), increasing by 2.5mg every four weeks. However, you may stay at a lower dose if it's working effectively. The entire titration period allows your body to adjust gradually and helps your prescriber identify the dose that works best for you.
Will the NHS prescribe me the same Mounjaro dose as private clinics?
Likely yes, as both follow the same titration schedule and MHRA/NICE guidance. However, NHS specialist services may have different capacity to monitor dose escalation or manage side effects compared to private providers. Your prescriber will work with your individual needs regardless of route — NHS or private.
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.