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 Chart Clicks: NHS Eligibility and UK Prescription Guide
Mounjaro (tirzepatide) is a prescription-only weight management injection available in the UK through NHS specialist services or private prescribing. Understanding the dose titration chart—often called "chart clicks"—helps you follow how the medication is gradually increased over several weeks. This guide explains NHS eligibility criteria, the NICE approval pathway, how the Mounjaro KwikPen dosing works, and what you need to know about accessing this medication in the UK.
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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 Mounjaro Titration in the UK
NHS eligibility for Mounjaro (tirzepatide): NICE has approved tirzepatide for use within NHS specialist weight management services. You may be eligible if you have a BMI of 30 or above, or a BMI of 27–29.9 with weight-related health conditions such as type 2 diabetes, hypertension, or obstructive sleep apnoea. For South Asian, Chinese, Black African, or Black Caribbean adults, lower BMI thresholds (27.5+) may apply due to higher cardiovascular risk at lower weights.
Dose titration and "chart clicks": Mounjaro uses a gradual escalation schedule starting at 2.5 mg weekly, increasing by one "click" every 4 weeks up to a maximum of 15 mg. Each KwikPen contains 4 weeks of doses. The timing of increases depends on how well you tolerate each dose and your individual response. Your prescriber will assess whether to continue escalating at each review.
- Week 1–4: 2.5 mg starting dose
- Week 5–8: 5 mg (first increase)
- Week 9–12: 7.5 mg (if appropriate)
- Week 13+: Further increases to 10, 12.5, or 15 mg based on tolerance and effect
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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
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NHS vs Private Access for Mounjaro in the UK
NHS route: Available through tier 3 specialist weight management services following GP referral. Access varies significantly by region (ICB) and availability. Waiting lists can be lengthy in many areas.
Private route: Available through GPhC-registered online pharmacies following a clinical assessment with a UK-licensed prescriber. No NHS referral required. Accessible without waiting, though costs apply (typically £129–£320 per month depending on dose).
Whichever route you choose, a prescriber will assess your individual eligibility, medical history, and suitability before issuing a prescription. Use our free BMI calculator and GLP-1 weight loss calculator to check your starting point and estimate potential weight loss outcomes at different doses.
- 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 does "chart clicks" mean for Mounjaro?
"Chart clicks" is informal terminology for the weekly dose escalation steps on the Mounjaro titration chart. Each dose level (2.5 mg, 5 mg, 7.5 mg, etc.) is maintained for 4 weeks before increasing to the next level, assuming good tolerance. Your prescriber reviews your progress at each step.
Can I get Mounjaro on the NHS in the UK?
Yes, NICE has approved tirzepatide (Mounjaro) for use within NHS specialist weight management services. You'll need a GP referral to a tier 3 service. Eligibility requires a BMI of 30+ or 27–29.9 with weight-related health conditions. Availability and waiting times vary by region.
What's the difference between Mounjaro and Wegovy?
Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist, whilst Wegovy (semaglutide) is a GLP-1 agonist only. Mounjaro has a maximum dose of 15 mg weekly, Wegovy reaches 2.4 mg. Clinical trial data suggest Mounjaro may produce slightly higher average weight loss, though individual results vary significantly.
How long does the Mounjaro titration chart last?
The full titration schedule typically takes 20+ weeks to reach maximum dose (15 mg), assuming you increase at each 4-week interval. Many people find their optimal dose at 10 mg or 12.5 mg and remain there rather than continuing to 15 mg. Your prescriber personalises this timeline based on your response and tolerance.
What happens if I can't tolerate a dose increase on Mounjaro?
If you experience side effects or intolerance, your prescriber can keep you at your current dose longer or reduce to the previous dose. Weight loss medication works best when you can tolerate it consistently. There's no requirement to reach the maximum dose—your personal optimal dose may be lower.
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.