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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What Is 0.6ml Mounjaro and How Does It Work?
0.6ml Mounjaro is not a standard dose of this weight management injection in the UK. Mounjaro (tirzepatide) is prescribed in milligram amounts, not millilitre volumes — the starting dose is 2.5mg, followed by escalation to 5mg, 7.5mg, 10mg, 12.5mg, or 15mg once weekly. If you've heard about a 0.6ml dose, you may be thinking of Wegovy (semaglutide), which has a 0.6mg starting dose. This guide clarifies the difference and helps you understand UK Mounjaro dosing.
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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 in the UK — Milligrams, Not Millilitres
Mounjaro dosing is measured in milligrams (mg), not millilitres (ml). The KwikPen delivery device contains 4 weeks' worth of injections, and each injection delivers a specific dose measured by weight, not volume.
- Starting dose: 2.5mg once weekly (weeks 1–4)
- First escalation: 5mg once weekly (weeks 5–8+)
- Further escalations: 7.5mg, 10mg, 12.5mg, 15mg — minimum 4 weeks at each dose
- Maximum dose: 15mg once weekly
Your prescriber will determine which dose is right for you based on clinical assessment and your response to treatment. Each dose increase requires at least 4 weeks before moving to the next level. This gradual titration helps your body adjust and can reduce gastrointestinal side effects.
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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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Why You Might Be Confused: Mounjaro vs Wegovy Dosing
If you've encountered references to 0.6ml in weight loss discussions, this is likely Wegovy (semaglutide), not Mounjaro. Wegovy also works as a GLP-1 receptor agonist for weight management in the UK, but uses a different dosing schedule and measurement system.
- Wegovy starts at 0.25mg (weeks 1–4), then escalates to 0.5mg, 1mg, 1.7mg, and maximum 2.4mg
- Mounjaro starts at 2.5mg and escalates to 15mg maximum
- Both are once-weekly injections prescribed in the UK
- Both require a clinical assessment and prescription from a licensed prescriber
The higher Mounjaro doses reflect its dual GIP + GLP-1 mechanism — different from Wegovy's single GLP-1 action. Talk to your prescriber about which medication may suit your needs.
- 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.
Is there a 0.6ml dose of Mounjaro available in the UK?
No. Mounjaro is dosed in milligrams, and the starting dose is 2.5mg, not 0.6ml. You may be thinking of Wegovy, which has a 0.25mg starting dose (escalating to 0.6mg as the second dose). Always clarify with your prescriber which medication you're discussing.
What is the actual starting dose of Mounjaro in the UK?
The starting dose of Mounjaro (tirzepatide) is 2.5mg once weekly for the first 4 weeks. Your prescriber will then assess your response and may increase to 5mg for weeks 5–8, with further increases possible up to a maximum of 15mg once weekly.
How do I know which dose of Mounjaro I should take?
Your prescriber will assess you individually and decide the appropriate starting dose and escalation plan based on your health, medical history, BMI, and any weight-related conditions. Use our free BMI calculator to understand your baseline, then discuss dosing with your prescriber during your clinical assessment.
Can I switch between Mounjaro and Wegovy?
Any switch between weight loss medications must be managed by your prescriber. Mounjaro (tirzepatide) and Wegovy (semaglutide) have different mechanisms and doses — approximate equivalences exist (for example, Mounjaro 5mg is roughly equivalent to Wegovy 0.5mg) but there is no official conversion chart. Always consult your prescriber.
Where can I get Mounjaro prescribed in the UK?
Mounjaro is prescription-only in the UK. You can access it through NHS specialist tier 3 weight management services (via GP referral) or through private online clinics using a UK-licensed prescriber. Both routes require a clinical assessment to confirm you're eligible before a prescription is issued.
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