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 Clicks: NHS Prescribing & UK Access
"Mounjaro clicks" refers to the dose escalation steps (clicks on the KwikPen) that deliver tirzepatide injections for weight management in the UK. Each click represents a dose increase, starting at 2.5 mg and reaching a maximum of 15 mg once weekly. Understanding how Mounjaro works in the UK health system—through NHS tier 3 specialist services or private prescription—helps you understand eligibility, costs, and what to expect from the dose titration process. This guide covers NHS access, NICE approval, and practical information about using Mounjaro safely in the UK.
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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.
NHS Eligibility & NICE Guidance for Mounjaro
NICE has approved tirzepatide (Mounjaro) for use within NHS weight management services, though access is significantly limited and varies by region. To be eligible for NHS-prescribed Mounjaro, you typically need a BMI of 30 or above, or BMI 27–29.9 with weight-related health conditions (type 2 diabetes, high blood pressure, cardiovascular disease, or sleep apnoea). For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, lower BMI thresholds may apply (from 27.5 onwards).
NHS access occurs through tier 3 specialist weight management services—not standard GP prescription. Your GP must refer you to your local specialist service, which then assesses suitability. Waiting times can extend several months to years in many regions due to high demand and limited capacity. Once approved, NHS services manage your dose titration (the progression from 2.5 mg through to 15 mg) alongside dietitian support and lifestyle coaching.
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.
Mounjaro Dose Clicks & Private vs NHS Routes
Each "click" on a Mounjaro KwikPen releases a weekly dose. The dose titration process follows a structured schedule: starting at 2.5 mg for weeks 1–4, then increasing by 2.5 mg increments every 4 weeks if tolerated, up to a maximum of 15 mg. This gradual escalation helps your body adjust and reduces side effects like nausea or stomach upset.
Privately prescribed Mounjaro offers faster access—you can receive a prescription within days following an online clinical assessment, without NHS waiting lists. Private costs range from approximately £129–£320 monthly depending on dose. NHS prescribing is free at point of use but involves longer waits. Our GLP-1 weight loss calculator can help you estimate potential weight loss at different Mounjaro dose levels to understand what to expect during your treatment journey.
- 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 "clicks" mean with Mounjaro?
Mounjaro KwikPens deliver doses through clicks. Each click releases a pre-set amount of tirzepatide. A 2.5 mg pen has one click, 5 mg has two clicks, 7.5 mg has three clicks, and so on, up to 15 mg. Patients don't adjust clicks themselves—each pen is pre-filled with a single dose for a specific week of treatment.
How long is the NHS waiting list for Mounjaro?
NHS waiting times vary significantly by region and local NHS ICB (Integrated Care Board) capacity. In many areas, waits can range from 6–18 months, though some regions have longer or shorter queues. Contact your GP or local tier 3 weight management service for current waiting times in your area.
Can I switch between Mounjaro and Wegovy on the NHS?
Switching between medications is possible but requires prescriber approval. There is no official UK conversion chart between tirzepatide (Mounjaro) and semaglutide (Wegovy). Any switch must be managed by your NHS specialist team or private prescriber based on your individual response and tolerability.
Is Mounjaro available on the NHS right now in the UK?
Yes, NICE has approved Mounjaro for NHS use within tier 3 specialist weight management services. However, availability is limited, varies by region, and waiting times are significant. Many areas still have restricted access. Your GP can tell you whether it's available through your local NHS service.
What is the difference between NHS and private Mounjaro prescribing?
NHS Mounjaro is free but involves referral, specialist assessment, and long waiting lists. Private Mounjaro requires an online clinical assessment with a UK-licensed prescriber and costs £129–£320 monthly depending on dose, but is available immediately without NHS referral. Both routes require a valid prescription and clinical suitability assessment.
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.