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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What Is Golden Dose Mounjaro?
"Golden dose" is an informal term sometimes used in online weight loss communities to describe the Mounjaro dose that produces optimal weight loss results for an individual—typically around 10–15 mg weekly. However, there is no official "golden dose" prescribed by the NHS or MHRA. Mounjaro comes as a pre-filled KwikPen containing liquid tirzepatide; the actual volume in millilitres depends on the dose strength. Your GP or prescriber determines the right dose for you through a gradual titration process based on your individual response, health conditions, and tolerability. Understanding how Mounjaro dosing works in the UK is essential before considering this prescription medication.
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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.
How Mounjaro Dose Titration Works in the UK
Mounjaro is not prescribed at a fixed "golden dose" for everyone. Instead, UK prescribers follow a gradual dose titration schedule over 20+ weeks:
- Weeks 1–4: 2.5 mg once weekly (starting dose)
- Weeks 5–8: 5 mg once weekly
- Weeks 9–12: 7.5 mg once weekly
- Weeks 13–16: 10 mg once weekly
- Weeks 17–20: 12.5 mg once weekly
- Week 21+: 15 mg once weekly (maximum dose)
Each KwikPen contains a pre-filled solution; the volume in millilitres is standardised by the manufacturer and depends on the dose strength. You stay on each dose for at least 4 weeks before escalation. Your prescriber may pause, reduce, or maintain your current dose if you experience significant side effects—there is no requirement to reach 15 mg. The "best" dose for you is the one that supports sustainable weight loss alongside reduced-calorie diet and physical activity, while remaining tolerable. Many people see significant results at 10 mg or 12.5 mg without needing the maximum 15 mg 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 on the NHS vs Private Prescribing in the UK
NHS prescribing: Mounjaro is available through NHS specialist tier 3 weight management services following NICE approval. Access requires a GP referral and assessment by a specialist team. Waiting lists vary by region (ICB); some areas have significant delays. The NHS provides the medication at no cost to the patient once prescribed.
Private prescribing: You can obtain a Mounjaro prescription privately through a UK-licensed online prescriber following a clinical assessment. Private prescriptions are dispensed by GPhC-registered pharmacies. Costs range from approximately £129–£320 per month depending on dose. Private access does not require NHS referral and is available sooner in most cases. Whether NHS or private, your prescriber will follow the same evidence-based titration schedule and monitor your progress carefully.
- 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 there a "golden dose" of Mounjaro that works for everyone?
No. "Golden dose" is informal slang, not a clinical term. Your prescriber determines your optimal dose through gradual titration based on your individual response, health, and tolerability. Most people see good results at 10–15 mg, but the right dose is personal. Some patients do well at lower doses; others reach 15 mg. There's no one-size-fits-all "golden" dose.
How much liquid is in each Mounjaro KwikPen?
Each pre-filled KwikPen contains a standardised volume of tirzepatide solution specific to its dose strength. The manufacturer pre-fills the pen; patients do not measure millilitres themselves. You inject the entire dose from the pen once weekly. The exact volume varies by dose but is always precisely measured by Novo Nordisk before dispensing.
Can I skip from 2.5 mg to 15 mg Mounjaro if that's the "golden dose"?
No. UK prescribers require at least 4 weeks at each dose level before escalation. Rapid dose escalation increases nausea, vomiting, and other gastrointestinal side effects significantly. Gradual titration allows your body to adapt and helps your prescriber identify the best effective dose for you—which may not be the maximum.
Will Mounjaro work better at 15 mg than at 10 mg for weight loss?
SURMOUNT clinical trial data showed average weight loss of approximately 19.5% at 10 mg and 20.9% at 15 mg—a modest difference. However, individual results vary considerably. Many people achieve excellent, sustainable weight loss at 10 mg or 12.5 mg with fewer side effects. Higher dose does not assures better results for you personally.
How do I access Mounjaro through the NHS in the UK?
Ask your GP for referral to a specialist tier 3 weight management service. You'll be assessed for eligibility (BMI ≥30, or BMI 27–29.9 with weight-related health conditions). Assessment and prescribing happen through the NHS specialist team. Waiting times vary by region. Private prescribing is faster but requires payment. Either route requires a prescription and clinical assessment by a UK-licensed prescriber. ```
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