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 Dose Levels in the UK — How to Access & Costs
Mounjaro (tirzepatide) comes in five different dose levels, ranging from 2.5mg to 15mg per week, with costs varying depending on whether you access it through the NHS or privately. Understanding your options, eligibility, and what each dose level means can help you make an informed decision about weight management treatment in the UK. This guide covers everything you need to know about Mounjaro levels, pricing, and how to get started.
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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.
Understanding Mounjaro Dose Levels and Private UK Costs
Mounjaro is available in five escalating dose levels, each designed to be taken once weekly as an injection. You begin at 2.5mg (weeks 1–4), then progress through 5mg, 7.5mg, 10mg, and 12.5mg before reaching the maximum maintenance dose of 15mg. Each dose level is typically maintained for a minimum of four weeks before escalation, allowing your body to adjust to the tirzepatide.
Private prescription costs for Mounjaro in the UK typically range from £129 to £320 per month, depending on which dose level you're on. Lower doses (2.5mg–5mg) are usually at the lower end of this range, while higher doses (10mg–15mg) cost more. Each KwikPen contains four weekly doses and costs are usually per-pen rather than per-dose. When comparing Mounjaro vs Wegovy privately, tirzepatide's dual GIP and GLP-1 mechanism may result in different weight loss outcomes, and pricing can vary between providers.
Private access through GPhC-registered online pharmacies typically involves an initial online consultation with a UK-licensed prescriber. This assessment ensures you meet eligibility criteria and that the medication is appropriate for your individual health situation.
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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.
Free Weight Loss Tools & Guides
Everything you need to understand your weight, explore medication options, and track your progress — completely free.
NHS Access vs Private Prescription — How to Get Started
NHS access to Mounjaro for weight management is through NICE-approved tier 3 specialist weight management services, not standard GP prescription. Your GP can refer you to your local specialist service, though waiting lists vary significantly by region (ICB area) and can extend many months in some areas. Tier 3 services assess your BMI, health conditions, and lifestyle factors before prescribing.
Private access is faster: You complete an online consultation (typically 10–15 minutes answering health questions), a UK-licensed prescriber assesses your suitability, and if approved, your prescription is dispensed by a GPhC-registered pharmacy within days. No NHS referral needed. Use the GLP-1 weight loss calculator on this page to estimate your potential weight loss at different Mounjaro dose levels. Your GP can advise on which route suits your circumstances best.
- 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 difference between Mounjaro dose levels?
Mounjaro starts at 2.5mg and increases in increments (5mg, 7.5mg, 10mg, 12.5mg, 15mg) over 20+ weeks. You stay on each dose for at least 4 weeks before escalating. Higher doses may support greater weight loss, though individual results vary. Your prescriber will recommend the dose that's right for you based on your response and tolerance.
How much does Mounjaro cost privately in the UK?
Private Mounjaro costs typically range from £129–£320 per month depending on dose level and provider. Each KwikPen (4-week supply) is priced per dose. Compare this with NHS access, which is free but involves potential waiting lists. Prices vary between GPhC-registered pharmacies, so it's worth checking options.
Can I get Mounjaro on the NHS in the UK?
Yes, but only through NICE-approved tier 3 specialist weight management services, not standard GP prescription. You need a GP referral and must meet NHS eligibility criteria (BMI ≥30 or ≥27.5 with weight-related health conditions). Waiting times vary by region; in some areas, lists are very long. Private prescription is faster but involves costs.
How do I access Mounjaro privately in the UK?
Complete an online health questionnaire with a UK-licensed prescriber through a GPhC-registered online pharmacy. If approved, you receive a prescription and the medication is dispatched within days. The whole process typically takes 1–3 days. No NHS referral is required, but you do need a prescription from a UK-licensed medical professional.
Is Mounjaro more expensive than Wegovy in the UK?
Costs are similar in the private market, though they vary by provider and dose. Mounjaro is a dual GIP+GLP-1 agonist while Wegovy is GLP-1-only, which affects how they work and potential outcomes. Ask your prescriber or pharmacy for current pricing on both options to compare directly based on your chosen dose level.
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.