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 Ml Per Dose — UK Dosing & Cost Guide
Each Mounjaro KwikPen contains 4 pre-filled doses in millilitres, with doses ranging from 2.5 mg to 15 mg once weekly. In the UK, Mounjaro is prescribed as a four-week starter pack, and each dose increases gradually over several months. Understanding the ml amounts, how dose titration works, and what costs you might face helps you prepare for treatment. This guide covers everything you need to know about Mounjaro dosing and access in the UK.
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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 Dose Amounts In Ml — UK Breakdown
Mounjaro is supplied as a pre-filled KwikPen injection device containing exactly 4 doses—one for each week of that month. Each dose is delivered in the following millilitre volumes:
- 2.5 mg dose: 0.25 ml (starting/adjustment dose, weeks 1–4)
- 5 mg dose: 0.5 ml (first escalation, weeks 5–8)
- 7.5 mg dose: 0.75 ml (further escalation, weeks 9–12)
- 10 mg dose: 1.0 ml (escalation, weeks 13–16)
- 12.5 mg dose: 1.25 ml (escalation, weeks 17–20)
- 15 mg dose: 1.5 ml (maximum dose, week 21 onwards)
Each KwikPen is single-use and contains tirzepatide—a dual GIP and GLP-1 receptor agonist. You inject once weekly, rotating your injection site between your stomach, thigh, or upper arm. Most people stay on each dose for at least 4 weeks before escalating, allowing your body to adjust to the medication.
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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 Cost & NHS Vs Private Access In The UK
NHS access: Mounjaro is available through tier 3 specialist weight management services following NICE approval, but access varies significantly by region. NHS waiting lists for specialist services can be lengthy, and not all ICBs (integrated care boards) currently fund it. You would need a GP referral.
Private access: Available through GPhC-registered online prescribing services following a clinical assessment. Costs typically range from £130–£250+ per month depending on the dose, with higher doses costing more. A typical starter pack (2.5 mg × 4 pens = 4 weeks) costs around £130–£150. Maintenance doses (5 mg and above) generally cost £150–£250 per month. You'll also need to budget for regular GP monitoring.
Use our free GLP-1 weight loss calculator to explore projected weight loss outcomes at different doses, and our BMI calculator to assess your starting point.
- 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 ml is each Mounjaro dose?
Mounjaro doses range from 2.5 mg (0.25 ml) to 15 mg (1.5 ml). Each KwikPen contains 4 pre-filled doses for one month. The ml volume increases as you escalate through the dose titration schedule over several months of treatment.
Can I get Mounjaro on the NHS in the UK?
Yes, Mounjaro (tirzepatide) is available on the NHS through tier 3 specialist weight management services following NICE approval. Access varies by region and ICB. You'll need a GP referral, and waiting lists can be several months long. Eligibility requires a BMI of 30+ or 27+ with weight-related health conditions.
What does Mounjaro cost privately in the UK?
Private Mounjaro costs range from approximately £130–£250+ per month depending on the dose. Starter doses (2.5 mg) cost around £130–£150 per month. Higher maintenance doses (10 mg–15 mg) typically cost £180–£250+ monthly. You'll also need regular GP monitoring, which may incur additional costs.
How long does each KwikPen last?
Each KwikPen contains exactly 4 doses, meaning each pen lasts 4 weeks. You'll need a new pen each month during your treatment. When escalating doses, you'll receive a pen with the higher strength.
What's the difference between Mounjaro ml and Wegovy ml dosing?
Mounjaro and Wegovy have different concentrations and dosing schedules. Mounjaro ranges from 2.5 mg (0.25 ml) to 15 mg (1.5 ml) once weekly. Wegovy ranges from 0.25 mg to 2.4 mg once weekly with a different ml scale. Both are prescription-only and require a clinical assessment to determine which is appropriate for you.
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