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 Use the Golden Dose Mounjaro in the UK
The "golden dose" of Mounjaro refers to the maximum 15mg weekly injection that many patients reach after dose titration. If you're considering Mounjaro for weight management in the UK, understanding how to access the golden dose, what it involves, and the associated costs will help you make an informed decision. This guide covers the prescription process, eligibility, and practical steps to getting started with tirzepatide in the UK.
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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.
Private Prescription Costs and Access Routes
In the UK, Mounjaro is available through two main routes: NHS specialist services and private prescription from GPhC-registered online prescribing services. Private access is typically faster, with costs varying by dose and provider. A single KwikPen (containing four weekly doses) of Mounjaro at the lower doses generally costs between £129–£200, while higher doses including the golden dose (15mg) typically range from £250–£320 per pen. Costs are usually paid upfront per pen, with no ongoing subscription fees in most cases. When comparing Mounjaro vs Wegovy, it's important to note that Wegovy (semaglutide) may have different pricing structures. Your chosen prescriber will outline exact pricing during consultation. Remember, Mounjaro is prescription-only and requires a clinical assessment before any medication is dispensed, regardless of which route you choose.
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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.
NHS vs Private: Eligibility and How to Start
NHS route: You'll need referral from your GP to a tier 3 specialist weight management service. Availability and waiting times vary significantly by region. NHS typically covers Mounjaro if you meet eligibility criteria: BMI ≥30, or BMI 27–29.9 with weight-related conditions like type 2 diabetes or hypertension. Private route: Complete an online consultation with a UK-licensed prescriber. Answer detailed health questions, and a prescriber will assess suitability within 24–48 hours. If approved, your prescription is sent to a GPhC-registered pharmacy for dispatch. This process usually takes 3–5 working days total. Use our GLP-1 weight loss calculator to explore potential outcomes at different doses, and our BMI calculator to check your starting point.
- 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 is the golden dose of Mounjaro?
The golden dose is the maximum approved Mounjaro dose of 15mg, administered once weekly. Most patients reach this through a 16–20 week titration schedule, starting at 2.5mg and increasing every 4 weeks. Reaching the golden dose is not necessary for everyone—many patients achieve meaningful weight loss at lower doses like 10mg.
How much does Mounjaro cost in the UK privately?
Private Mounjaro costs typically range from £129–£200 per pen (four doses) for lower doses, and £250–£320 for the golden dose 15mg pen. Prices vary between providers. NHS coverage depends on your region and tier 3 service availability, which is free at point of use.
Do I need a prescription to buy Mounjaro in the UK?
Yes, Mounjaro is prescription-only in the UK. You cannot purchase it without a valid prescription from a UK-licensed healthcare professional. Both NHS and private routes require a clinical assessment before a prescription is issued.
How long does it take to reach the golden dose?
The standard Mounjaro dose titration takes approximately 16–20 weeks to reach 15mg, as you increase by one dose level every 4 weeks. You start at 2.5mg, then progress through 5mg, 7.5mg, 10mg, 12.5mg, and finally 15mg. Some people may stay at lower doses if they achieve desired results.
Is Mounjaro available on the NHS in all UK regions?
No. NHS access to Mounjaro varies by region and ICB (Integrated Care Board). You'll need referral to a tier 3 specialist weight management service via your GP. Waiting times and availability differ significantly—some areas have several-month waits. Check with your local NHS weight management service for specific timelines.
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.