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 10ml — NHS Access and Prescribing in the UK
Mounjaro 10ml is the third standard dose escalation of tirzepatide, a prescription-only weight management injection available in the UK. This guide explains how the 10mg dose fits into NHS and private prescribing pathways, eligibility criteria, and what you need to know about accessing this medication through UK healthcare routes. Whether you're considering NHS referral or exploring private options, understanding the dose structure and clinical context is essential before speaking with your GP or prescriber.
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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.
NHS Eligibility and the 10mg Dose in UK Prescribing
The 10mg dose of Mounjaro (tirzepatide) is typically reached around week 13–16 of treatment, following standard dose escalation. To be eligible for Mounjaro through NHS specialist tier 3 weight management services, adults must have a BMI of 30 kg/m² or above, or a BMI of 27–29.9 with weight-related health conditions such as type 2 diabetes, high blood pressure, or obstructive sleep apnoea.
For South Asian, Chinese, Black African, and Black Caribbean adults, lower thresholds apply — eligibility may begin at BMI 27.5 or above, reflecting higher cardiovascular risk in these populations. The 10mg dose is not a starting dose; it's an escalation point reached only after tolerance has been assessed at lower doses (2.5mg, 5mg, 7.5mg). At 10mg, clinical trial data shows an average weight loss of approximately 19.5% of body weight when combined with reduced-calorie diet and increased physical activity, though individual results vary significantly.
- NHS access requires GP referral to your regional tier 3 specialist weight management service
- Waiting times vary by region; many areas have lengthy waiting lists
- The 10mg dose is only prescribed after at least 12 weeks on lower doses
- Prescribing is managed by specialist multidisciplinary teams, not standard GP practice
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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 Routes for Mounjaro 10ml in the UK
NHS specialist services prescribe Mounjaro following NICE guidance, but availability and waiting times are highly variable across ICBs (Integrated Care Boards). If referred to an NHS tier 3 service, you'll be assessed, titrated through lower doses, and monitored by specialists before reaching 10mg. Private online prescribing offers faster access without waiting lists — a UK-licensed prescriber conducts an online clinical assessment and, if appropriate, issues a prescription dispensed by a GPhC-registered pharmacy.
Both routes require a clinical assessment and a valid prescription; neither route assures treatment. Use our free GLP-1 weight loss calculator to estimate projected outcomes at the 10mg dose, and our BMI calculator to check your starting point. Private treatment typically costs £129–£320 per month depending on dose and provider. Whether NHS or private, the 10mg dose represents a mid-to-upper escalation point; some patients plateau at 7.5mg or 5mg if that dose is effective.
- 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 happens at the Mounjaro 10mg dose?
At 10mg (weeks 13–16 of treatment), you've escalated through lower doses. Clinical trials showed approximately 19.5% average body weight loss at this dose. Individual results vary; some patients achieve target weight at lower doses. Your prescriber will assess tolerance and whether to continue escalating to 12.5mg or 15mg, or maintain at 10mg.
Can I access Mounjaro 10ml through the NHS?
Yes, but access is through NHS tier 3 specialist weight management services, not standard GP prescription. You'll need a GP referral, eligibility assessment (BMI ≥30 or ≥27 with comorbidities), and placement on a waiting list. Waiting times vary significantly by region — some areas have multi-month delays. Once accepted, specialists manage your full dose titration pathway.
How long does it take to reach the 10mg dose?
Approximately 13–16 weeks. You start at 2.5mg, then escalate through 5mg, 7.5mg before reaching 10mg. Each dose is held for minimum four weeks to assess tolerance. Prescribers may adjust the pace based on side effects or response. Some patients plateau at lower doses and do not escalate to 10mg.
What are the side effects of the 10mg dose?
The most common side effects (nausea, diarrhoea, constipation, stomach pain) are typically experienced throughout titration, not specifically at 10mg. They often reduce over time. Serious side effects like pancreatitis or gallbladder issues are rare but require urgent medical attention. Always report new symptoms to your prescriber.
Is the 10mg dose the maximum?
No. Mounjaro escalates to 12.5mg and 15mg as maximum doses. The 10mg dose is mid-escalation. Some patients benefit from the higher doses; others achieve their goals at 10mg. Your prescriber will decide whether further escalation is appropriate based on response and tolerance.
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.