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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Understanding Mounjaro's Golden Dose in the UK
The "golden dose" of Mounjaro typically refers to the 10 mg weekly injection — the dose where many people experience optimal weight loss results in clinical trials. However, the right dose for you depends on your individual health, weight, and how your body responds during the dose titration schedule. In the UK, Mounjaro is available through both NHS specialist services and private prescription routes, each with different costs and access timelines. Understanding how Mounjaro dosing works, what the golden dose means, and how to access it will help you make an informed decision about whether this weight management option is right for you.
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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.
How Mounjaro Dose Titration Works in the UK
Mounjaro comes as a once-weekly injection delivered via a pre-filled KwikPen device. The dose titration schedule starts low and gradually increases over 20 weeks to minimise side effects and allow your body to adapt:
- Weeks 1–4: 2.5 mg (starting dose)
- Weeks 5–8: 5 mg (first escalation)
- Weeks 9–12: 7.5 mg
- Weeks 13–16: 10 mg (often called the "golden dose")
- Weeks 17–20: 12.5 mg
- Week 21+: 15 mg (maximum dose)
You must spend at least 4 weeks on each dose before increasing. The 10 mg dose achieved an average weight loss of approximately 19.5% in clinical trials, which is why many refer to it as the golden dose. However, not everyone needs or tolerates higher doses — your prescriber will assess your response and adjust accordingly. The tirzepatide KwikPen makes self-injection straightforward: subcutaneous injection into your stomach, thigh, or upper arm, once per week on the same day.
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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 Cost & Access in the UK: NHS vs Private
NHS access: Available through tier 3/4 specialist weight management services after GP referral. NICE approved Mounjaro for NHS use, but regional availability varies significantly — waiting lists can be months to years depending on your area. There is no direct NHS cost to you, but access depends on your local ICB (Integrated Care Board) capacity.
Private access: Available through GPhC-registered online pharmacies following a brief online consultation with a UK-licensed prescriber. Private costs typically range from £129–£320 per month depending on dose and provider. At the 10 mg golden dose, expect to pay around £200–£280 per month privately. Prescriptions are issued instantly if approved, and medication is usually delivered within 2–3 days. Use our GLP-1 weight loss calculator to explore projected weight loss outcomes, and our BMI calculator to confirm your eligibility before seeking a prescription.
- 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 exactly is the "golden dose" of Mounjaro?
The golden dose refers to the 10 mg weekly dose of Mounjaro (tirzepatide). In SURMOUNT-1 clinical trials, this dose produced average weight loss of approximately 19.5% of body weight over 72 weeks, alongside reduced-calorie diet and increased physical activity. It's considered optimal because it balances significant weight loss results with tolerability for many users. Your prescriber may recommend staying at lower doses if you experience side effects or achieve your goals earlier.
How long does it take to reach the golden dose of Mounjaro?
It takes 16 weeks to reach the 10 mg golden dose if you tolerate each escalation well. You must spend exactly 4 weeks on each dose (2.5 mg → 5 mg → 7.5 mg → 10 mg). Some people may remain at lower doses if they experience persistent side effects or achieve their weight loss goals. Your prescriber may pause escalation or adjust the timeline based on your individual response.
How much does Mounjaro cost privately in the UK?
Private Mounjaro costs vary by dose and provider. At lower doses (2.5–5 mg), expect £129–£180 per month. At the golden dose (10 mg), costs are typically £200–£280 per month. Higher doses (12.5–15 mg) may cost £250–£320 per month. Prices include the consultation, prescription, and delivery. Always check current pricing with your chosen provider, as costs can vary and change over time.
Can I get Mounjaro on the NHS in the UK?
Yes, NICE approved Mounjaro (tirzepatide) for NHS weight management. Access is through tier 3/4 specialist services after GP referral. You must have a BMI of 30 or above, or 27–29.9 with weight-related health conditions. NHS availability varies significantly by region — some areas have capacity; others have long waiting lists. Ask your GP about NHS specialist weight management services in your area for current eligibility and waiting times.
Is the golden dose the right dose for everyone?
No. The golden dose (10 mg) works well for many people, but the right dose is individual. Some achieve their goals at 5 mg or 7.5 mg and experience fewer side effects at lower doses. Others may need the full 15 mg dose. Your prescriber will assess your response at each dose escalation and may recommend staying at a lower dose if you're experiencing significant side effects, have reached your target weight, or have underlying health considerations.
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.