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
What Does Mounjaro Cost in the UK?
Mounjaro (tirzepatide) pricing in the UK varies significantly depending on whether you access it through the NHS or privately. Private costs typically range from £129–£320 per month depending on your dose and provider, while NHS access is free but availability is limited to specialist weight management services. Understanding your options helps you make an informed decision about accessing this prescription weight loss injection.
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Calculate Your BMI Instantly
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: NHS vs Private Access
NHS access: If prescribed through an NHS specialist tier 3 or tier 4 weight management service, Mounjaro is free once you've been approved. However, NHS access is limited and varies significantly by region. You'll need a GP referral to a specialist service, and waiting lists can extend several months to over a year in many areas. NICE has approved tirzepatide for NHS use, but regional ICBs (integrated care boards) control availability, so some areas may have restricted access or specific eligibility criteria.
Private access: Through a GPhC-registered online pharmacy following an online clinical assessment with a UK-licensed prescriber, private costs are typically:
- 2.5–5 mg dose: £129–£180/month
- 7.5–10 mg dose: £180–£240/month
- 12.5–15 mg dose: £240–£320/month
Prices vary by provider. Always check that the pharmacy is GPhC-registered before purchasing.
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.
Factors Affecting Mounjaro Cost in the UK
Several factors influence what you'll pay for Mounjaro privately. Dose level is the primary cost driver — higher doses cost more because each KwikPen device contains four weekly doses. Provider pricing differs between pharmacies, so comparing costs across several UK online pharmacies is worthwhile. Consultation fees also vary — some providers bundle the clinical assessment into the medication cost, while others charge separately (typically £20–£60). Using our GLP-1 weight loss calculator can help you estimate potential medication needs based on your starting weight and health goals, which may inform your budgeting decision.
- 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 in the UK?
Yes, NICE has approved tirzepatide (Mounjaro) for NHS use in specialist weight management services (tier 3 and 4). However, availability is limited and varies by region. You'll need a GP referral and may face a waiting list. NHS access is free once approved, but access criteria and waiting times differ across ICBs.
How much does a Mounjaro KwikPen cost privately in the UK?
Private costs typically range from £129–£320 per month depending on your dose. Lower doses (2.5–5 mg) start around £129–£180/month, while maximum doses (12.5–15 mg) cost £240–£320/month. Each pen contains four weekly doses. Prices vary between GPhC-registered pharmacies.
What's included in the private Mounjaro price?
The price usually covers the medication (KwikPens for a month's supply) and sometimes the online clinical assessment. Some providers charge separately for the consultation (£20–£60). Always check what's included before purchasing, and confirm the pharmacy is GPhC-registered.
Can I use a prescription from my GP at a private pharmacy?
If your GP prescribes Mounjaro, you can take the prescription to any pharmacy. However, most GPs do not prescribe Mounjaro for weight management — it's typically prescribed through specialist services. For private access, the prescriber and pharmacy usually work together in an integrated system.
How do I compare Mounjaro prices in the UK?
Visit several GPhC-registered online pharmacies that offer Mounjaro and request quotes for your target dose. Compare the medication cost plus any consultation fees. Our BMI calculator and weight loss projection tool can help you determine your starting dose, which will help you budget accurately.
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.