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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How to Get the Golden Dose From Your Mounjaro Pen
The "golden dose" is an informal term UK users apply to the Mounjaro KwikPen dose that delivers optimal weight loss with manageable side effects — usually between 10mg and 15mg. However, the right dose varies significantly between individuals, and it's determined through a structured titration process starting at 2.5mg and increasing every 4 weeks under prescriber guidance. This guide explains how Mounjaro's dose escalation works, what clinical evidence shows, and how it compares to Wegovy (semaglutide) so you can understand what to expect from your prescription.
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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.
Understanding Mounjaro Dose Titration and Individual Response
Mounjaro (tirzepatide) works through a dual GIP and GLP-1 mechanism — unlike Wegovy which activates only the GLP-1 pathway. This dual action may contribute to stronger weight loss results in clinical trials, though individual response varies considerably.
The SURMOUNT-1 trial showed average weight loss of approximately 15% at 5mg, 19.5% at 10mg, and 20.9% at the maximum 15mg dose over 72 weeks — but these are population averages, not individual assures. Your prescriber will guide you through this dose titration schedule:
- Weeks 1–4: 2.5mg (starting dose)
- Weeks 5–8: 5mg (first increase)
- Weeks 9–12: 7.5mg (optional escalation)
- Weeks 13–16: 10mg (commonly considered effective)
- Weeks 17–20: 12.5mg (further escalation)
- Week 21+: 15mg (maximum dose)
You must remain on each dose for at least 4 weeks before increasing. The "golden dose" concept refers to finding your personal sweet spot — where weight loss is meaningful and side effects are tolerable. For many users this falls between 10mg and 15mg, but it's unique to you.
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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 vs Wegovy — How They Differ in Dose and Effect
Wegovy (semaglutide) is a GLP-1-only receptor agonist, meaning it uses a single mechanism rather than Mounjaro's dual approach. This affects both dosing and results. Wegovy doses escalate from 0.25mg up to a maximum of 2.4mg over 16 weeks, with STEP trial data showing average weight loss around 14.9% at the highest dose.
Neither medication assures specific outcomes — individual results vary significantly based on genetics, lifestyle adherence, existing health conditions, and personal metabolism. Your prescriber will assess which medication is appropriate through clinical evaluation. Both require a prescription following thorough assessment. Use our GLP-1 weight loss calculator to estimate potential results at different doses, and track progress with our free progress tracker as you titrate upward.
- 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 exactly is the "golden dose" of Mounjaro?
The "golden dose" is an informal term for the Mounjaro dose that achieves meaningful weight loss with manageable side effects for an individual — typically between 10mg and 15mg. It's not a fixed dose; rather, it's your personal optimal point found through titration under prescriber guidance. Clinical data shows increasing benefits up to 15mg, but side effects like nausea may limit what you can tolerate.
How long does it take to reach a higher Mounjaro dose?
Mounjaro requires 4 weeks on each dose before escalating. Starting at 2.5mg, reaching 10mg takes approximately 13 weeks (starting weeks 1–4, then 5–8, then 9–12, then 13–16). Reaching the maximum 15mg dose takes approximately 21 weeks from start. Your prescriber may adjust this timeline based on your response and side effects.
Is Mounjaro's golden dose the same as Wegovy's?
No. Mounjaro's maximum is 15mg weekly; Wegovy's maximum is 2.4mg weekly. Direct dose comparison is misleading because they use different mechanisms — Mounjaro is dual GIP+GLP-1, Wegovy is GLP-1-only. Clinical trials show similar average weight loss percentages (around 15–21% for Mounjaro, around 15% for Wegovy), but individual suitability depends on your health profile, not on dose equivalence.
What happens if I have side effects on my current Mounjaro dose?
If side effects are severe, your prescriber may pause escalation, reduce to the previous dose, or discuss stopping treatment. Common side effects like nausea often improve after a few weeks on the same dose. Never adjust your dose yourself — always contact your prescriber. Side effects are usually temporary, but your health and safety come first.
Can I use the MyWeightCheck GLP-1 calculator to predict my golden dose?
Our GLP-1 weight loss calculator shows estimated weight loss at different Mounjaro and Wegovy doses based on clinical trial data. However, it cannot predict your personal "golden dose" — that's determined through your individual titration journey with your prescriber, considering your health, side effects, and response. Use it for general education, but rely on clinical assessment for personalised dosing.
Ready to take control of your weight loss journey?
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