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 Mounjaro In The UK
The "golden dose" of Mounjaro refers to the maximum 15mg once-weekly injection that many people aim to reach during dose titration. If you're interested in accessing tirzepatide (Mounjaro) in the UK, you have two main routes: NHS specialist services or private prescription through a licensed online prescriber. This guide explains the cost, eligibility, timelines, and what the dose escalation process actually involves. Use our free GLP-1 weight loss calculator to explore potential outcomes, and our BMI calculator to check your current health status.
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Calculate Your BMI Instantly
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 Access And Cost Context For Mounjaro In The UK
Private prescription route: The most straightforward way to access Mounjaro quickly in the UK is through a GPhC-registered online pharmacy following an online clinical assessment with a UK-licensed prescriber. No NHS referral needed.
- Typical private costs range from approximately £129–£320 per month depending on your dose and provider
- Starting dose (2.5mg) costs less than maintenance doses (10–15mg)
- The golden dose (15mg) typically costs around £280–£320 per month privately
- Costs may vary between providers — shop around
- Each KwikPen contains 4 weeks of doses
- Payment is usually direct to the pharmacy — not through NHS
Compared to Wegovy (semaglutide), tirzepatide's dual GIP+GLP-1 mechanism may offer slightly different results, though individual outcomes vary significantly. Private access means you avoid NHS waiting lists, which can extend many months in some regions.
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
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 Access Versus Private: Timeline And Eligibility
NHS route: Free on prescription but requires referral to a tier 3 specialist weight management service through your GP. Waiting lists vary dramatically by region — some areas have waits of 1–2 years. When you do access NHS tirzepatide, prescribers typically follow the same dose escalation protocol as private providers.
Online consultation process (private): You complete a health questionnaire, a licensed prescriber reviews it (usually within 24 hours), and if approved, a prescription is issued to a registered pharmacy. Your first prescription typically arrives within 2–5 working days. You'll receive detailed injection guidance and can contact your prescriber with questions. Dose increases follow NHS-aligned protocols: minimum 4 weeks at each dose level before escalating toward the golden dose.
- 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.
How much does Mounjaro cost privately in the UK per month?
Private Mounjaro costs typically range from £129–£320 per month depending on your current dose. Starting dose (2.5mg) is cheaper at around £129–£150. The maximum golden dose (15mg) costs approximately £280–£320 per month. Costs vary between providers, so it's worth comparing. Each KwikPen contains 4 weekly doses.
How long does dose titration to the golden dose take?
Reaching the 15mg golden dose typically takes 20–24 weeks (about 5–6 months). You start at 2.5mg and increase every 4 weeks: 2.5mg → 5mg → 7.5mg → 10mg → 12.5mg → 15mg. Your prescriber may adjust this based on side effects or response. You don't have to reach 15mg if lower doses work well for you.
Can I get Mounjaro free on the NHS?
Yes, Mounjaro is available on the NHS through specialist tier 3 weight management services, but access requires a GP referral and varies significantly by region. Waiting lists are often very long (months to years in many areas). Private prescription avoids waiting lists but costs approximately £129–£320 monthly depending on dose. NHS access is free but slower; private is faster but costs money.
What's the difference between Mounjaro and Wegovy for cost and access?
Mounjaro (tirzepatide) and Wegovy (semaglutide) are both prescription-only weight loss injections available in the UK via NHS or private routes. Private costs are similar (£129–£320/month). Mounjaro uses a dual GIP+GLP-1 mechanism; Wegovy uses GLP-1 only. Clinical trial data showed Mounjaro achieved slightly higher average weight loss (~21% vs ~15%), though individual results vary considerably.
Do I need a GP referral to get Mounjaro privately?
No. Private online prescribers assess you independently — you don't need a GP referral. You complete an online health questionnaire, a UK-licensed prescriber reviews it, and if suitable, issues a prescription directly to a pharmacy. This is why private access is faster. However, it's still wise to inform your GP you're taking Mounjaro so they can monitor your health alongside the medication.
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.