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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How Many Clicks Is Each Mounjaro Dose?
Mounjaro comes in a pre-filled KwikPen device with a specific number of clicks to deliver each dose of tirzepatide. Understanding your click count helps you administer the injection correctly and track your dose escalation. This guide explains Mounjaro dosing, the click mechanism in the UK, and NHS eligibility criteria for accessing this prescription-only weight management injection.
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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 KwikPen Clicks by Dose
Each Mounjaro KwikPen uses a click-based delivery system. The number of clicks needed depends on your dose, as each pen contains multiple four-week supplies:
- 2.5 mg dose: 1 click
- 5 mg dose: 2 clicks
- 7.5 mg dose: 3 clicks
- 10 mg dose: 4 clicks
- 12.5 mg dose: 5 clicks
- 15 mg dose: 6 clicks
Each KwikPen contains four separate doses (four weeks of supply). After injecting, you'll hear a click as the dose is delivered. Always check your prescription label for your specific dose, as clicking the wrong number can result in delivering an incorrect dose. Store your pen in the refrigerator (2–8°C) when not in use, and allow it to reach room temperature before injecting. If you're unsure about your clicks, your GP or prescriber can confirm your exact dosing schedule during your clinical assessment.
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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 Access and Eligibility for Mounjaro in the UK
In the UK, Mounjaro (tirzepatide) is available through NHS specialist weight management services (tier 3 or 4) and private prescribing. NHS eligibility typically requires: BMI of 30 or above, or BMI of 27–29.9 with weight-related health conditions such as type 2 diabetes, high blood pressure, or cardiovascular disease. South Asian, Chinese, Black African, and Black Caribbean adults may be eligible at lower BMI thresholds. Access through the NHS usually involves referral to a specialist service and may involve waiting lists. Private access is available through online consultations with UK-licensed prescribers, where eligibility is assessed individually. Your GP can advise on your local NHS options, or you can explore private routes if NHS waiting times are lengthy.
- 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 do I know if I'm using the correct number of clicks on my Mounjaro KwikPen?
Your prescription label will specify your dose (e.g., 5 mg). Count the corresponding clicks from the list above (5 mg = 2 clicks). You'll hear and feel a click as each dose is delivered. If you're unsure, contact your GP or prescriber before injecting—they can confirm your exact click count.
Can I adjust my Mounjaro dose myself, or do I need medical supervision?
Mounjaro dose adjustments must be managed by your prescriber. The standard schedule increases the dose every 4 weeks until you reach your maintenance dose. Never change your click count or injection frequency without guidance from your GP or clinic. Your prescriber will assess how you're tolerating the medication before escalating.
What's the difference between Mounjaro and Wegovy in terms of dosing in the UK?
Mounjaro (tirzepatide) starts at 2.5 mg and escalates to a maximum of 15 mg weekly. Wegovy (semaglutide) starts at 0.25 mg and escalates to 2.4 mg weekly. Mounjaro is a dual GIP and GLP-1 agonist, whilst Wegovy is a GLP-1 agonist only. Both are once-weekly injections. Your prescriber will determine which is appropriate for you following a clinical assessment.
How long does it take to reach the maximum Mounjaro dose of 15 mg?
The standard schedule takes approximately 20 weeks (5 months) to reach 15 mg, with a 4-week interval between each dose increase. However, individual schedules may vary based on how well you tolerate the medication and your clinical response. Your prescriber may adjust this timeline if needed.
Can I use MyWeightCheck's BMI calculator and GLP-1 weight loss calculator to track my Mounjaro progress?
Yes. Our free BMI calculator helps you monitor your BMI at different weights throughout your treatment, and our GLP-1 weight loss calculator can show you projected outcomes based on clinical trial data. These tools work alongside your medical supervision—always follow your prescriber's guidance on dosing and progress monitoring.
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.