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 10mg: NHS Access and UK Prescribing Information
Mounjaro 10mg is an intermediate maintenance dose of tirzepatide, a prescription-only weight management injection licensed in the UK. At this dose, clinical trials showed participants lost an average of approximately 19.5% of their body weight. Access in the UK is through either NHS specialist tier 3 weight management services or private prescribing following a clinical assessment. This guide explains NHS eligibility, how the 10mg dose fits into the titration schedule, and what to expect from this dosage level.
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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.
NHS Eligibility and Access for Mounjaro 10mg
Mounjaro is prescribed through NHS specialist tier 3 weight management services — not standard GP practice. NICE has approved tirzepatide (Mounjaro) for eligible UK adults, but access varies significantly by region and ICB (Integrated Care Board).
You may qualify for NHS Mounjaro if you have:
- BMI of 30 kg/m² or above, or
- BMI of 27–29.9 kg/m² with at least one weight-related health condition (type 2 diabetes, high blood pressure, abnormal blood fats, sleep apnoea, or cardiovascular disease)
- For South Asian, Chinese, Black African, or Black Caribbean adults: lower thresholds apply (BMI 27.5+ may qualify)
NHS referral typically begins with your GP, who will refer you to your local tier 3 service. Waiting lists can be lengthy in many areas — sometimes months or over a year. Once approved, the 10mg dose is usually reached around week 9–12 of treatment, following the standard titration schedule (2.5mg → 5mg → 7.5mg → 10mg).
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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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Mounjaro 10mg: Dosing, Efficacy, and Side Effects
At 10mg weekly, Mounjaro targets a maintenance dose where many patients see significant appetite reduction and weight loss support. Each KwikPen contains four weekly doses, lasting one month. The 10mg dose can be increased further to 12.5mg and 15mg if needed, each after a minimum of four weeks.
At the 10mg dose level, expect:
- Nausea, constipation, or diarrhoea (very common in early weeks, often improves)
- Reduced appetite and earlier satiety (fullness after smaller meals)
- Injection site reactions (mild, at needle point)
- Occasional dizziness or fatigue
Track your progress using our free progress tracker to monitor weight changes, symptoms, and how you feel week to week. Always report side effects to your prescriber — dose adjustments or timing may help.
- 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 long does it take to reach the 10mg Mounjaro dose on NHS?
Following the standard NHS titration schedule, most patients reach 10mg around week 9–12 of treatment. You start at 2.5mg (weeks 1–4), then escalate to 5mg (weeks 5–8), 7.5mg (weeks 9–12), then 10mg (week 13+). Each increase requires a minimum of four weeks at the previous dose.
Will the NHS prescribe Mounjaro 10mg if my BMI is 27?
Possibly, if your BMI is 27–29.9 and you have at least one weight-related health condition such as type 2 diabetes, high blood pressure, sleep apnoea, or cardiovascular disease. South Asian, Chinese, Black African, or Black Caribbean adults may qualify at lower BMI. Your GP referral to tier 3 services will trigger an individual assessment.
What's the difference between Mounjaro and Wegovy at similar dose levels?
Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist; Wegovy (semaglutide) is GLP-1 only. At 10mg, Mounjaro typically produces greater appetite suppression than Wegovy's equivalent doses. Both are prescription-only. Use our GLP-1 weight loss calculator to estimate potential outcomes at different doses.
Can I get Mounjaro 10mg privately if NHS waiting lists are too long?
Yes. Private UK-licensed prescribers can assess and prescribe Mounjaro following an online clinical consultation. Private routes typically offer faster access than NHS tier 3 services, though costs apply (usually £129–£320 monthly depending on dose and provider). A prescriber will still conduct a full health assessment.
What if I experience severe side effects at the 10mg dose?
Contact your prescriber immediately. You may stay at 10mg longer, return to a lower dose, or switch medications entirely. Severe abdominal pain, persistent vomiting, or gallbladder symptoms require urgent medical attention. Never adjust or stop your dose without prescriber guidance, whether on NHS or private prescription.
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