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 Dosing Chart: UK Costs and Access Routes
Understanding how Mounjaro (tirzepatide) is dosed and what it costs in the UK is essential if you're considering this prescription-only weight management injection. The dosing follows a structured titration schedule over several weeks, with costs varying significantly depending on whether you access it through the NHS or privately. This guide explains the complete dosing chart, how much Mounjaro costs in the UK, and the different pathways to getting a prescription.
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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 Dosing Schedule and UK Private Costs
Mounjaro titration schedule: The standard UK dosing protocol starts at 2.5 mg and increases every 4 weeks if tolerated, reaching a maximum of 15 mg weekly. Each KwikPen contains 4 pre-filled doses (a 4-week supply). Private prescription costs in the UK typically range from £129 to £320 per month depending on your current dose and the provider. Lower doses (2.5 mg to 5 mg) are generally at the lower end of this range, while higher maintenance doses (10 mg to 15 mg) cost more. These costs cover the medication only — consultation fees may be separate. Many private providers offer tiered pricing or package discounts for multiple months. Unlike some medications, Mounjaro costs remain consistent regardless of pharmacy, as the manufacturer controls pricing across licensed UK dispensers. Your prescriber will advise which dose is appropriate for you during your clinical assessment.
- Starting dose: 2.5 mg weekly (weeks 1–4)
- First escalation: 5 mg weekly (weeks 5–8)
- Subsequent escalations: 7.5 mg, 10 mg, 12.5 mg, 15 mg at 4-week intervals
- Minimum time at each dose: 4 weeks before increasing
- Maximum dose: 15 mg weekly
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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: How to Access Mounjaro in the UK
NHS access: Mounjaro is available through NHS specialist tier 3 weight management services, but access is limited and varies significantly by region. Your GP can refer you to your local ICB (Integrated Care Board) specialist service, though waiting lists can stretch to 6–12 months or longer in many areas. Once prescribed through the NHS, you pay the standard prescription charge (currently £9.90 in England). Private access: You can obtain Mounjaro privately by completing an online consultation with a UK-licensed prescriber registered with the General Pharmaceutical Council. If clinically appropriate, a prescription is issued and dispensed by a GPhC-registered online pharmacy. This route bypasses NHS waiting lists but involves out-of-pocket costs. Your private prescriber will check your medical history, BMI, and weight-related conditions to confirm eligibility before issuing a prescription.
- 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 is the standard Mounjaro dosing schedule in the UK?
Mounjaro starts at 2.5 mg weekly and increases by 2.5–5 mg every 4 weeks, reaching a maximum of 15 mg weekly. Each increase occurs only if tolerated. The titration schedule helps minimise side effects like nausea whilst allowing your body to adjust. Your prescriber may adjust the schedule based on how you respond.
How much does Mounjaro cost on private prescription in the UK?
Private Mounjaro costs typically range from £129 to £320 per month depending on your dose. Lower doses (2.5–5 mg) are cheaper, whilst higher maintenance doses (10–15 mg) cost more. Costs vary by provider but are relatively consistent across licensed UK dispensers. Some providers offer discounts for 3 or 6-month supplies.
Can I get Mounjaro on the NHS in the UK?
Yes, Mounjaro is available on the NHS through specialist tier 3 weight management services. You need a GP referral to your local ICB specialist service. Availability and waiting times vary significantly by region — some areas have long waiting lists. Once prescribed, you pay the standard prescription charge (£9.90 in England).
What is the difference between Mounjaro (tirzepatide) and Wegovy (semaglutide)?
Mounjaro is a dual GIP and GLP-1 receptor agonist, whilst Wegovy is a GLP-1 agonist only. Clinical trials showed Mounjaro achieved slightly higher average weight loss (~15–21% body weight) compared to Wegovy (~15%). Both are once-weekly injections and prescription-only. Individual results vary significantly.
How do I get a private Mounjaro prescription in the UK?
Complete an online consultation with a UK-licensed prescriber through an approved provider. The prescriber assesses your medical history, BMI, and weight-related health conditions. If eligible, they issue a prescription dispensed by a GPhC-registered pharmacy. The entire process typically takes 24–48 hours. You'll need to upload your NHS number and recent weight/height measurements.
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