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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Mounjaro Golden Dose 5mg — What It Means
The "golden dose" of Mounjaro refers to the 5mg maintenance dose — the first therapeutic dose after the starting 2.5mg phase. In clinical practice, many patients find the 5mg dose effective for weight management, though individual results vary significantly. This guide explains how the 5mg dose works, what to expect, and whether it might be suitable for you following a clinical assessment from a UK prescriber.
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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 5mg Works and What the Dose Titration Means
Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist — this is the key difference that distinguishes it from other weight loss injections like Wegovy. The 5mg dose is the first maintenance dose in the Mounjaro dose titration schedule, reached after 4 weeks on the starting 2.5mg dose.
- Week 1–4: 2.5mg (starting/adjustment dose)
- Week 5–8+: 5mg (first maintenance dose — often called the "golden dose")
- Week 9–12+: 7.5mg (escalation if needed)
- Week 13+: 10mg, 12.5mg, 15mg (further escalation available)
The 5mg dose represents the point at which many patients experience meaningful appetite reduction and weight loss support. Clinical evidence suggests this dose may be sufficient for many people, though some benefit from further escalation. Always follow your prescriber's guidance on dose progression based on your individual response.
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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.
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Expected Weight Loss and Side Effects at 5mg
Clinical trial data shows Mounjaro 5mg produces measurable weight loss in most patients, though results vary widely. Early data from SURMOUNT trials suggests patients on the 5mg maintenance dose experience gradual weight loss over weeks 5–12, with side effects typically improving as the body adapts. Common side effects at this dose include nausea, diarrhoea, and reduced appetite — most manage-able for many users.
At the 5mg dose, you'll inject once weekly using a Mounjaro KwikPen. Your prescriber may recommend staying at 5mg for 4+ weeks before escalating, depending on how you respond and tolerate the medication. Use our free GLP-1 weight loss calculator to estimate potential outcomes, and track your progress with our free progress tracker.
- 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.
Why is 5mg called the "golden dose" of Mounjaro?
The 5mg dose is the first therapeutic maintenance dose after the 2.5mg starting phase. It's sometimes called the "golden dose" in patient discussions because many people experience effective appetite reduction and weight loss support at this level without needing further escalation. However, this is informal terminology — your prescriber will assess what dose is right for you.
How much weight can you lose on Mounjaro 5mg?
Individual results vary significantly. Clinical trials show patients on higher Mounjaro doses achieve greater weight loss, but 5mg alone may produce meaningful results for some people. On average, weight loss is gradual and depends on diet, activity level, and individual response. Never expect assured outcomes — always discuss realistic expectations with your prescriber.
Will I need to escalate beyond the 5mg Mounjaro dose?
Not necessarily. Some patients achieve their weight loss goals at 5mg and remain on this dose long-term. Others benefit from escalation to 7.5mg, 10mg, or higher. Your prescriber will assess your progress at each 4-week interval and recommend escalation only if clinically appropriate and if you've tolerated the current dose well.
Is Mounjaro 5mg available on the NHS in the UK?
Mounjaro has NICE approval for NHS use within specialist tier 3 weight management services, but availability varies significantly by region (ICB) and local waiting lists can be lengthy. Private UK prescribing is also available through online clinical assessment and GPhC-registered pharmacies, often with quicker access.
How does Mounjaro 5mg compare to Wegovy?
Mounjaro is a dual GIP and GLP-1 agonist, whereas Wegovy (semaglutide) is a GLP-1 agonist only. Wegovy's maximum dose (2.4mg) differs from Mounjaro's structure. Clinical trial data shows both medications support weight loss, but individual response varies. Your prescriber will help determine which is more suitable based on your health profile.
Ready to take control of your weight loss journey?
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