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 Pen Click Chart — How to Access It in the UK
The Mounjaro KwikPen uses a simple click-based dosing system that makes weekly injections straightforward. Understanding how the pen works, what each click dose represents, and how to access tirzepatide in the UK — whether through NHS specialist services or private prescription routes — helps you make informed decisions about weight management options. This guide covers the practical and financial aspects of getting Mounjaro in the UK, from eligibility through to ongoing costs.
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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.
How Mounjaro KwikPen Dosing Works and UK Prescription Costs
Mounjaro comes as a pre-filled KwikPen device. Each pen contains 4 doses (4 weeks of injections), and each click delivers a specific amount of tirzepatide. The dose escalation follows a structured titration schedule: you start at 2.5 mg and increase every 4 weeks until reaching your effective maintenance dose, which may be 5 mg, 7.5 mg, 10 mg, 12.5 mg, or the maximum of 15 mg per week.
UK private prescription costs typically range from £129 to £280 per month, depending on your dose. Higher doses (10 mg, 12.5 mg, 15 mg) cost more than lower starting doses (2.5 mg, 5 mg). The cost per pen (4-week supply) usually falls between £32 and £70 depending on your dose tier and the prescribing service. Many people find that costs are lower when purchasing multiple months in advance. Unlike some weight loss medications, Mounjaro is not typically available on the NHS for routine weight management, though exceptional access applications may be considered in some regions.
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
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 — What Route Is Right for You?
NHS access to Mounjaro is limited. Your GP can refer you to a tier 3 specialist weight management service, but tirzepatide availability depends heavily on your local Integrated Care Board (ICB) and waiting list capacity. NHS access typically involves a long wait—sometimes months or years—and may require you to complete a structured weight management programme first.
Private access is faster. You complete an online clinical consultation with a UK-licensed prescriber, provide health information, and receive a prescription within 24–48 hours if appropriate. The prescription is then dispensed by a GPhC-registered pharmacy. This route requires you to pay privately but offers immediate access without NHS waiting lists. Use our GLP-1 weight loss calculator to understand potential outcomes at different doses, and speak with your prescriber about which dose escalation schedule suits your health 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.
How much does Mounjaro cost per month in the UK privately?
Private Mounjaro costs typically range from £129 to £280 per month depending on your dose. Starting doses (2.5 mg–5 mg) are generally cheaper (around £129–£160/month), while higher maintenance doses (10 mg–15 mg) cost £200–£280/month. Each KwikPen supplies 4 weeks of injections. Costs vary between providers, and some offer discounts for multi-month purchases.
Can I get Mounjaro on the NHS in the UK?
Mounjaro is rarely available on the NHS for routine weight management. You would need referral to a tier 3 specialist weight management service via your GP, and availability depends on your local ICB. Waiting lists can be very long. Exceptional access applications exist but are considered case-by-case. Most people access Mounjaro privately in the UK.
What happens during an online consultation for Mounjaro?
You'll complete a health questionnaire covering your weight, height, medical conditions, medications, and weight loss history. A UK-licensed prescriber reviews this and may ask follow-up questions. If appropriate, they issue a prescription. The whole process typically takes 24–48 hours. You'll receive advice on self-injection, side effects, and when to increase your dose. This is not medical advice—your prescriber will assess your individual suitability.
Is the KwikPen hard to use, and is each click the same dose?
The KwikPen is designed to be user-friendly. Each click delivers the full weekly dose (not fractions). You rotate injection sites each week—stomach, thigh, or upper arm. Your prescriber or pharmacist will demonstrate the technique. Most people find the pen intuitive after the first injection. Store unopened pens in the fridge (2–8°C); after first use, keep at room temperature and use within 30 days.
What's the difference between Mounjaro and Wegovy in the UK?
Mounjaro (tirzepatide) is a dual GIP+GLP-1 agonist; Wegovy (semaglutide) is GLP-1 only. Both are once-weekly injections for weight management in the UK. Mounjaro starts at 2.5 mg and goes up to 15 mg; Wegovy starts at 0.25 mg and maxes at 2.4 mg. Clinical trials suggest Mounjaro may produce slightly greater average weight loss, but individual results vary. Your prescriber will advise which is more suitable for you based on NHS NICE guidance and your health profile.
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.