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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Is 0.6ml Mounjaro Available in the UK?
There is no 0.6ml Mounjaro dose available in the UK. Mounjaro (tirzepatide) comes in pre-filled pens with fixed doses measured in milligrams, starting at 2.5mg. If you've heard about 0.6ml doses, this may be confusion with Wegovy (semaglutide), which uses a similar syringe-style pen with different dose measurements. This guide explains actual Mounjaro dosing in the UK, NHS eligibility criteria, and how to access tirzepatide through both NHS and private routes.
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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.
Understanding Mounjaro Doses and NHS Prescribing
Mounjaro (tirzepatide) doses in the UK are measured in milligrams (mg), not millilitres (ml). The medication comes in a pre-filled KwikPen device that delivers a fixed dose each week. Starting dose is 2.5mg, escalating weekly by 2.5mg increments up to a maximum of 15mg. Each pen contains four weekly doses and is used once weekly. The 0.6ml measurement may relate to Wegovy (semaglutide), which has different dosing in millilitres.
NHS prescribing of tirzepatide occurs through tier 3 specialist weight management services, not standard GP practices. NICE has approved tirzepatide for use within NHS weight management services for adults with a BMI of 30 or above, or 27–29.9 with weight-related health conditions. However, NHS availability varies significantly by region and waiting times can be substantial. Private online prescribing also offers access following a clinical assessment with a UK-licensed prescriber.
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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 Access for Mounjaro in the UK
NHS access: Requires referral to a tier 3 weight management service from your GP. Assessment considers your BMI, health conditions, and previous weight loss attempts. Access varies by region (ICB) and some areas have limited availability or extended waiting lists. Private access: Available through GPhC-registered pharmacies following an online consultation with a UK-licensed prescriber. No GP referral needed, though clinical suitability is still assessed. Private routes typically offer faster access but involve personal cost. Both routes require a clinical assessment to confirm eligibility and rule out contraindications before tirzepatide is prescribed.
Using our free GLP-1 weight loss calculator, you can explore potential weight loss projections with different doses, and our BMI calculator will help confirm whether you fall into the eligible BMI range for prescription weight loss treatment.
- 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 lowest dose of Mounjaro available in the UK?
The starting dose of Mounjaro (tirzepatide) in the UK is 2.5mg once weekly. This is increased by 2.5mg each week until reaching an effective maintenance dose or the maximum of 15mg. The 0.6ml measurement does not apply to Mounjaro — doses are always in milligrams.
Is Mounjaro available on the NHS?
Yes, tirzepatide (Mounjaro) is approved by NICE for use within NHS specialist tier 3 weight management services. Access is through referral from your GP and depends on your BMI and health conditions. Regional availability and waiting times vary significantly across the UK.
What is the difference between 0.6ml Wegovy and Mounjaro?
Wegovy (semaglutide) is measured in millilitres and comes at doses like 0.6ml; Mounjaro (tirzepatide) is measured in milligrams starting at 2.5mg. Both are once-weekly injections for weight management in the UK, but they use different medications and dosing systems.
Can I get 0.6ml Mounjaro privately in the UK?
No — 0.6ml is not a Mounjaro dose. If you're considering private prescription weight loss treatment, a UK-licensed prescriber will assess you and prescribe an appropriate Mounjaro dose (2.5mg to 15mg) or potentially a different GLP-1 medication based on your clinical suitability.
How do I know if I'm eligible for Mounjaro on the NHS?
You may be eligible if you have a BMI of 30 or above, or 27–29.9 with weight-related health conditions like type 2 diabetes, hypertension, or cardiovascular disease. For South Asian, Chinese, Black African, or Black Caribbean adults, lower thresholds apply. Your GP can assess your eligibility and refer you to a specialist weight management service.
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.