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: UK Costs, Access & How to Get It
The "golden dose" refers to the 15mg maintenance dose of Mounjaro (tirzepatide), which is the maximum dose prescribed for weight management in the UK. This page explains what the golden dose is, how much it costs in the UK, how to access it through NHS or private prescription, and what to expect during the dose titration process. Whether you're considering Mounjaro or comparing it to alternatives like Wegovy, understanding costs and access routes is essential for making an informed decision.
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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.
What Is the Mounjaro Golden Dose and How Much Does It Cost?
The Mounjaro golden dose is the 15mg once-weekly injection — the maximum maintenance dose prescribed for weight management in the UK. Most patients reach this dose after a 20-week titration schedule, starting at 2.5mg and escalating by 2.5mg every four weeks. Clinical trial data shows that at the 15mg dose, Mounjaro helped participants lose an average of approximately 20.9% of their body weight, though individual results vary significantly.
- UK private cost: approximately £200–£320 per month depending on provider, dose, and consultation fees
- Monthly injections: one KwikPen (4-week supply) per month once at maintenance dose
- NHS access: available through specialist tier 3/4 weight management services, though regional availability and waiting lists vary considerably
- Prescription requirement: all doses require a valid UK prescription from a licensed prescriber following clinical assessment
The golden dose represents the point where most weight loss benefits plateau — further escalation beyond 15mg is not recommended. Our GLP-1 weight loss calculator can help you understand potential outcomes at different doses based on clinical data.
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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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NHS vs Private Access: How to Get Mounjaro in the UK
NHS route: Referral to a specialist weight management service (typically tier 3) through your GP. Access is free on prescription, but availability varies by integrated care board (ICB) and waiting lists can extend many months in some areas. NICE has approved tirzepatide for NHS use, but prescribing is limited to specialist services, not routine GP prescription.
Private route: Online consultation with a UK-licensed prescriber through a registered pharmacy. Requires completion of a health questionnaire, clinical assessment (usually a brief telephone or video call), and prescription issuance if you meet eligibility criteria. This route typically takes days rather than months and does not require NHS referral. Use our BMI calculator to check your eligibility status before consulting a prescriber.
Both routes require you to meet UK eligibility criteria: BMI 30 or above, or BMI 27+ with weight-related health conditions. Individual results vary, and Mounjaro should be used alongside dietary changes and increased physical activity for best outcomes.
- 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 the Mounjaro golden dose 15mg the same as Wegovy's maximum dose?
No. Mounjaro's maximum is 15mg once weekly, whilst Wegovy's maximum is 2.4mg once weekly. These are different medications with different mechanisms. Mounjaro is a dual GIP/GLP-1 agonist, whilst Wegovy is a GLP-1 agonist only. Clinical trials show Mounjaro achieved slightly higher average weight loss (~21% vs ~15%), but individual results vary. Both are prescription-only and require clinical assessment.
How long does it take to reach the golden dose of 15mg?
Typically 20 weeks on the standard titration schedule: 2.5mg weeks 1–4, then increase by 2.5mg every four weeks until reaching 15mg at week 21. Some prescribers may adjust this timeline based on side effects or individual tolerance. Your prescriber will discuss the appropriate pace for you during your clinical assessment.
What happens if I can't tolerate the golden dose?
Not everyone reaches or stays on 15mg. Many patients achieve good weight loss results at lower doses (10mg or 12.5mg) with fewer side effects. Your prescriber can adjust your dose downward if you experience intolerable side effects. The goal is finding the effective dose you can sustain long-term, not necessarily reaching the maximum.
Does the NHS cost the same as private for Mounjaro?
NHS Mounjaro is free on prescription (covered by NHS funding), whilst private prescription typically costs £200–£320 per month depending on the provider and dose. NHS access is through specialist services only, not routine GP prescription. Private access is faster but involves out-of-pocket costs.
Can I switch from Wegovy to Mounjaro to reach a higher dose?
Yes, switching is possible and managed by a prescriber — some people do switch to achieve higher weight loss potential. There is no official conversion chart; your prescriber will restart titration or adjust based on your previous dose tolerance. Any medication switch should be discussed with your prescriber to ensure it's appropriate for your individual health.
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.