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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Understanding Your Mounjaro 5th Dose — UK Cost & Access
The fifth dose of Mounjaro represents your escalation to 10mg — the point where many patients reach their optimal tirzepatide response. Whether you're accessing this through the NHS or privately in the UK, understanding cost and accessibility is essential. This guide explains what the 5th dose means, how much it costs, and how to access it through both NHS and private routes.
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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 5th Dose Cost in the UK
The fifth Mounjaro dose represents your 10mg weekly injection — typically reached around week 13 of treatment. At this stage, you've completed the standard dose titration schedule: 2.5mg (weeks 1–4), 5mg (weeks 5–8), 7.5mg (weeks 9–12), and 10mg from week 13 onwards.
Private prescription costs for Mounjaro in the UK vary by provider and dose. At the 10mg stage, expect to pay between £180–£280 per month through private online prescribing services, depending on the provider and whether you're accessing the service for the first time or as an existing patient. Each KwikPen contains four weekly doses, so one pen lasts approximately four weeks. Some providers offer tiered pricing or loyalty discounts for repeat prescriptions.
NHS access to Mounjaro, including the 5th dose escalation, is provided through specialist tier 3 weight management services at no direct cost to the patient. However, NHS availability remains limited and varies significantly by region — waiting times can extend several months in many areas.
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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.
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NHS vs Private Access for Mounjaro Dose Escalation
NHS route: If you're already receiving Mounjaro through an NHS specialist weight management service, your 5th dose (10mg) escalation happens automatically as part of your structured dose titration plan. Your prescriber will monitor your response and side effects before increasing the dose. No additional cost, but progression depends on NHS service capacity and your individual clinical response.
Private route: Through a private online consultation with a UK-licensed prescriber, you can access Mounjaro at any approved dose if clinically appropriate. The prescriber assesses your eligibility and current health status, then a GPhC-registered pharmacy dispenses your prescription. This route offers faster access — often within days rather than months — but you pay the full cost of the medication. Consultations typically cost £50–£100 and are usually one-off or annual fees depending on the provider.
Use our GLP-1 weight loss calculator to explore potential outcomes at different doses, including the 10mg stage.
- 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 "5th dose" mean for Mounjaro?
The 5th dose is your escalation to 10mg tirzepatide, typically reached at week 13 of treatment. It represents the standard mid-range maintenance dose for many patients, following the four-week escalations from 2.5mg upwards. Some patients escalate further to 12.5mg or 15mg depending on their response and tolerability.
How much does a Mounjaro 10mg KwikPen cost privately in the UK?
Private Mounjaro 10mg costs approximately £180–£280 per month through UK online prescribing services, varying by provider. Each pen contains four weekly doses. First-time consultations may incur an additional £50–£100 prescriber assessment fee. Prices may differ between providers, so comparing options is recommended.
Can I get Mounjaro's 5th dose through the NHS?
Yes, if you're already receiving Mounjaro through an NHS specialist weight management service, your dose escalation to 10mg happens as part of your treatment plan at no direct cost. However, NHS access is limited and availability varies significantly by region. Many areas have substantial waiting lists.
How long does escalation to the 5th dose take?
Standard Mounjaro dose titration takes approximately 16 weeks to reach 10mg: 2.5mg weeks 1–4, 5mg weeks 5–8, 7.5mg weeks 9–12, then 10mg from week 13. Your prescriber may adjust this timeline based on your side effects and individual response. Some patients stay longer at lower doses.
What's the difference between accessing Mounjaro privately vs through NHS?
Private access offers faster prescription (days rather than months) and freedom to start at any approved dose, but you pay the full medication cost. NHS access is free but involves specialist service referral, clinical assessment, and potentially long waiting lists. Both routes require a prescription from a UK-licensed prescriber.
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.