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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How Much Does Mounjaro Cost Per Month in the UK?
Mounjaro costs vary significantly depending on whether you access it through the NHS or privately in the UK. Through the NHS, Mounjaro (tirzepatide) is typically free once prescribed by a specialist tier 3 weight management service, though access is limited and involves waiting lists. Private prescriptions cost between £129 and £280 per month, depending on your dose and the prescribing provider. This guide explains UK pricing, NHS eligibility through NICE guidance, and how costs vary across the dose titration schedule.
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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.
Mounjaro Costs: NHS vs Private in the UK
NHS cost: Once prescribed by an NHS tier 3 specialist weight management service, Mounjaro is dispensed free on the NHS prescription. However, NHS access is severely limited — most regions have long waiting lists (months to years in some areas), and availability depends on your local integrated care board (ICB). NICE has approved tirzepatide (Mounjaro) for weight management in eligible adults, but provision remains patchy across England, Scotland, Wales, and Northern Ireland.
Private cost range: Through private online prescribing services, Mounjaro typically costs £129–£280 per month depending on your dose. The Mounjaro KwikPen contains 4 doses (4 weeks supply), so monthly costs reflect your current dose level. Starting doses (2.5 mg) are cheaper; maximum doses (15 mg) are at the higher end.
- Starter dose (2.5–5 mg): approximately £129–£150/month
- Mid-range doses (7.5–10 mg): approximately £180–£220/month
- Higher doses (12.5–15 mg): approximately £240–£280/month
These prices are approximate and vary between providers. Always confirm the exact price with your prescriber before starting treatment.
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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 Eligibility and the NICE Approval Context
NICE approved tirzepatide (Mounjaro) for weight management in 2024, but this does not assures rapid NHS access. You typically need referral to a specialist tier 3 weight management service by your GP — these services assess your eligibility based on BMI and health conditions. Eligibility generally requires a BMI of 30 or above, or 27 or above with weight-related conditions like type 2 diabetes or high blood pressure. However, NHS provision is extremely limited outside major centres. Many patients choose private prescribing to avoid NHS waiting lists, where a licensed prescriber conducts an online clinical assessment and issues a prescription within days if appropriate. Use our GLP-1 weight loss calculator to explore potential outcomes at different doses, and our BMI calculator to check whether you may meet eligibility criteria.
Private prescribing route: Faster access than NHS (typically 3–7 days from consultation to first dose), no waiting list, but you pay for the medication. Requires a clinical assessment by a UK-licensed prescriber via an online consultation. NHS route: Free medication once prescribed, but significant waiting times and variable regional availability. Your GP refers you to tier 3 services, which may involve several months' wait for an initial assessment. Neither route assures a prescription — eligibility must be established by the prescriber. Both routes require you to demonstrate commitment to lifestyle changes (diet and exercise) alongside medication.
- 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.
Is Mounjaro free on the NHS in the UK?
Once prescribed by an NHS specialist tier 3 weight management service, Mounjaro is free on the NHS. However, access is severely limited — waiting lists can be 12–24 months in many areas. Availability depends on your local integrated care board. Many patients choose private prescribing to avoid these delays.
What does Mounjaro cost privately per month in the UK?
Private Mounjaro costs approximately £129–£280 per month depending on your dose. Starting doses (2.5–5 mg) cost around £129–£150; maximum doses (15 mg) cost £240–£280. These are approximate figures — always confirm exact pricing with your prescriber before treatment.
How long does Mounjaro titration take and does cost increase?
Mounjaro titration takes approximately 16–20 weeks to reach maximum dose (15 mg), with a 4-week minimum at each dose level. Your monthly cost increases as your dose increases. Starting at 2.5 mg and progressing through 5 mg, 7.5 mg, 10 mg, 12.5 mg, and finally 15 mg means costs rise progressively over 4–5 months.
Can I get Mounjaro vs Wegovy on the NHS and does cost differ?
Both Mounjaro (tirzepatide) and Wegovy (semaglutide) are approved by NICE for weight management on the NHS, though availability is extremely limited in most areas. Private costs differ: Mounjaro typically costs slightly more per month than Wegovy. Your prescriber can discuss which is more suitable for you based on individual health factors.
Do I need to pay for NHS GP referral to tier 3 weight management services?
No — referral to NHS tier 3 weight management services is free. Your GP can refer you at no cost. However, waiting times for initial assessment are very long in many areas (6–24 months). Once assessed and prescribed by the service, the medication is free on the NHS.
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.