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
How Much Does Mounjaro Cost in the UK?
Mounjaro (tirzepatide) is a prescription-only weight management injection available in the UK through both NHS specialist services and private online prescribing. The cost varies significantly depending on whether you access it through the NHS or privately, your dose, and which provider you use. Understanding pricing, eligibility, and how to access Mounjaro can help you make an informed decision about this GLP-1 and GIP receptor agonist medication.
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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 Pricing in the UK
Private prescription costs typically range from £129 to £320 per month, depending on your dose and the online pharmacy provider. Lower doses (2.5 mg and 5 mg) are usually at the lower end of this range, while higher maintenance doses (10 mg, 12.5 mg, 15 mg) cost more. Each KwikPen contains four weekly doses, so costs are usually quoted per pen or per month.
- Starting dose (2.5 mg): typically £129–£160/month
- Mid-range doses (5–7.5 mg): typically £160–£220/month
- Maintenance doses (10–15 mg): typically £220–£320/month
Private access requires a clinical assessment with a UK-licensed prescriber before your prescription is issued. This assessment is usually included in the overall cost or charged separately (typically £15–£50).
NHS access is free at point of use for eligible patients, but availability varies significantly by region and waiting times can be months or years in many areas.
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 vs Private Access to Mounjaro
NHS route: If you're eligible (BMI 30 or above, or 27+ with weight-related health conditions), you can ask your GP for a referral to a specialist tier 3 weight management service. Once prescribed through the NHS, Mounjaro is free. However, not all regions have capacity, and waiting lists are common.
Private route: You can access Mounjaro through GPhC-registered online prescribing services without an NHS referral. A UK-licensed prescriber reviews your medical history and assesses eligibility within 24 hours. If approved, your prescription is sent to a regulated pharmacy for dispensing. This route is faster but involves out-of-pocket costs. Use our GLP-1 weight loss calculator to explore potential outcomes, or try our BMI calculator to check your current category and eligibility thresholds.
- 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 available on the NHS?
Yes, Mounjaro is approved by NICE for use within NHS specialist weight management services. However, availability varies by region (ICB), and many areas have long waiting lists. You'll need a GP referral to a tier 3 weight management service. Not all GP practices or regions can prescribe it immediately.
What's included in the private Mounjaro cost?
The monthly cost typically covers the medication itself (the KwikPen with four weekly doses) and the online clinical assessment. Some providers include follow-up consultations; others charge separately. Always check what's included before purchasing. Shipping is usually free within the UK.
Are there any hidden costs with private Mounjaro?
Beyond the monthly prescription cost, you may face follow-up consultation fees (typically £15–£50), repeat prescription fees, or delivery charges depending on your provider. Some pharmacies offer subscription discounts if you commit to multiple months. Check the full terms before ordering.
How does Mounjaro cost compare to Wegovy?
Both are similarly priced privately (approximately £129–£320/month depending on dose), though exact costs vary by provider and dose. Mounjaro's maximum dose (15 mg) may cost slightly more than Wegovy's maximum (2.4 mg). Cost should not be the only factor—discuss with your prescriber which is clinically more suitable for you.
Will the cost of Mounjaro come down?
As with any patent-protected medication, prices may change over time. Currently, tirzepatide (Mounjaro) remains expensive, but NHS rollout is expanding and private competition may affect pricing. Check with providers regularly for any promotional offers or subscription savings.
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.