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
Free tracker included with every download this week
Understanding Dose Titration On Mounjaro In The UK
"Winding on" Mounjaro refers to the gradual dose escalation schedule — starting at 2.5 mg and increasing every 4 weeks up to the maximum 15 mg dose. In the UK, this structured approach helps your body adjust while minimising side effects. Whether you're prescribed through NHS specialist services or via private assessment, understanding the titration pathway is essential for managing expectations and monitoring progress. This guide explains how the dose escalation works, NHS eligibility criteria, and what to expect at each stage of the journey.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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 And Mounjaro Dose Escalation In The UK
In the UK, Mounjaro (tirzepatide) is prescribed through NHS tier 3 specialist weight management services or privately via GPhC-registered pharmacies following a clinical assessment. The dose escalation, or "winding on", follows this schedule: weeks 1–4: 2.5 mg, weeks 5–8: 5 mg, weeks 9–12: 7.5 mg, weeks 13–16: 10 mg, weeks 17–20: 12.5 mg, and week 21 onwards: 15 mg maximum. Each dose is a once-weekly KwikPen injection.
You must remain on each dose for a minimum of 4 weeks before increasing. The MHRA-approved information states that escalation supports tolerability and allows your system to adjust. However, not everyone reaches the maximum dose — your prescriber will assess your response and any side effects at each stage. NHS NICE guidance supports tirzepatide for eligible adults with a BMI of 30 or above, or 27–29.9 with weight-related conditions including type 2 diabetes, high blood pressure, or cardiovascular disease. For South Asian, Chinese, Black African, and Black Caribbean adults, lower BMI thresholds (27.5+) may apply due to higher health risks at lower weights.
Calculate your BMI now using the free BMI calculator on this page to check your starting eligibility, and use our GLP-1 weight loss calculator to explore potential outcomes at different doses.
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 Access Versus Private Prescribing For Mounjaro In The UK
NHS route: Referral to tier 3 specialist weight management services from your GP. Assessment involves discussing your medical history, eligibility, and suitability. Waiting lists vary significantly by region and ICB — some areas have waits of 6–12+ months. Once prescribed, you collect your KwikPen from an NHS pharmacy. Cost is free on the NHS.
Private route: Online consultation with a UK-licensed prescriber, typically available within days. If approved, your prescription is dispensed by a GPhC-registered pharmacy. Costs range from approximately £129–£320 per month depending on dose. Private prescribing doesn't require NHS referral or waiting lists. Both routes involve the same dose titration schedule and require ongoing clinical monitoring. Your GP should be informed of private treatment. Track your progress with our free progress tracker throughout your Mounjaro 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 "winding on" Mounjaro mean?
"Winding on" refers to the gradual dose escalation schedule where your Mounjaro dose increases every 4 weeks, from 2.5 mg up to a maximum of 15 mg. This structured approach helps your body adapt and allows your prescriber to monitor your response and any side effects at each stage.
Can I skip doses during titration if I have side effects?
No. Each dose must be maintained for a minimum of 4 weeks before escalating. However, if you experience significant side effects, inform your prescriber immediately — they may delay your next increase or adjust your treatment plan. Never skip doses without guidance.
How long does it take to reach the maximum Mounjaro dose?
Reaching the maximum 15 mg dose takes a minimum of 20 weeks if you escalate every 4 weeks without delays. However, not everyone escalates to 15 mg — your prescriber will assess your response, tolerability, and health outcomes at each stage and may keep you on a lower maintenance dose.
Is there a difference in titration between NHS and private Mounjaro prescriptions in the UK?
No. Both NHS and private prescriptions follow the same MHRA-approved dose escalation schedule and safety protocols. The main differences are access route, waiting times, and cost — not the medical approach to titration.
What should I do if I miss a dose during my titration schedule?
If you miss a dose within 4 days, take it as soon as remembered and continue your normal schedule. If more than 4 days have passed, skip that dose and take your next dose on your usual day. Never take a double dose. Always contact your prescriber for guidance on rescheduling if necessary.
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.