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: Ml Dosing and NHS UK Guidance
The "golden dose" of Mounjaro (tirzepatide) refers to the maintenance dose where most patients experience optimal weight loss results. In the UK, this is typically 10–15 mg once weekly, though individual responses vary significantly. Understanding Mounjaro dosing, NHS eligibility criteria, and how UK prescribing works can help you make informed decisions about weight management. This guide covers the complete UK context for Mounjaro dosing and access through NHS tier 3 services or private routes.
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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.
Mounjaro Dosing and the "Golden Dose" Explained
Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist delivered as a once-weekly injection. The medication is titrated gradually to find the dose that works best for each individual — this is why there is no single "golden dose" that suits everyone, though clinical data suggests the maintenance range of 10–15 mg provides significant average weight loss.
Dosing schedule in the UK:
- 2.5 mg — weeks 1–4 (starting dose)
- 5 mg — weeks 5–8 (first maintenance)
- 7.5 mg — weeks 9–12 (escalation if needed)
- 10 mg — weeks 13–16 (therapeutic dose)
- 12.5 mg — weeks 17–20 (escalation)
- 15 mg — week 21+ (maximum dose)
The SURMOUNT-1 clinical trial showed that at 15 mg, participants achieved an average weight loss of approximately 20.9% of body weight over 72 weeks, alongside reduced-calorie diet and increased physical activity. At 10 mg, average loss was around 19.5%. However, individual results vary considerably — some patients stabilise at lower doses with good outcomes, while others benefit from escalation to the maximum.
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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
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NHS Mounjaro Access and Eligibility in the UK
In the UK, Mounjaro is available through NHS tier 3 specialist weight management services following NICE approval. You cannot obtain Mounjaro directly from your GP — you must be referred to a specialist multidisciplinary team for assessment. Eligibility requires a BMI of 30 kg/m² or above, or 27–29.9 kg/m² with weight-related health conditions such as type 2 diabetes, high blood pressure, or cardiovascular disease. For people of South Asian, Chinese, Black African, or Black Caribbean heritage, lower thresholds may apply (BMI 27.5+). NHS waiting lists vary significantly by region — some areas have lengthy queues, while availability remains limited in others. Private prescribing through licensed UK clinicians offers faster access without NHS referral but involves out-of-pocket costs. Use our GLP-1 weight loss calculator to explore potential outcomes, and our BMI calculator to confirm your eligibility range.
- 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 term "golden dose" typically refers to the dose where most patients experience optimal results. For Mounjaro, clinical data suggests the 10–15 mg range is where significant average weight loss occurs, but the truly effective dose varies by individual. Your prescriber will find your personal optimum through dose titration.
Is Mounjaro available on the NHS in the UK?
Yes, Mounjaro (tirzepatide) was approved by NICE for NHS use in specialist tier 3 weight management services. However, you must be referred by your GP and meet strict eligibility criteria (BMI ≥30 or BMI 27–29.9 with comorbidities). Waiting lists vary by region — some areas have significant delays.
How much does each Mounjaro dose in ml weigh?
Mounjaro doses are measured in milligrams (mg), not millilitres (ml). Each pre-filled KwikPen contains 4 weeks of your prescribed dose. The volume is fixed at approximately 0.5 ml per injection regardless of dose strength, as the concentration of tirzepatide changes per dose level.
Can I get Mounjaro faster through private prescribing in the UK?
Yes. Private UK clinicians can issue Mounjaro prescriptions following an online clinical assessment, typically within days. This bypasses NHS waiting lists but requires payment. Always ensure you use a GPhC-registered pharmacy and UK-qualified prescriber to ensure safety and legitimacy.
Does Mounjaro work better than Wegovy for weight loss?
Mounjaro (tirzepatide, dual GIP+GLP-1) achieved approximately 20.9% average weight loss at 15 mg in SURMOUNT trials, while Wegovy (semaglutide, GLP-1 only) achieved approximately 14.9% at 2.4 mg. However, individual responses vary significantly. Neither medication works equally well for everyone — your prescriber will advise which suits your circumstances.
Ready to take control of your weight loss journey?
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