The UK's most complete GLP-1 guide
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- 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 Price Changes in the UK
Mounjaro (tirzepatide) pricing in the UK has been subject to changes that affect both NHS availability and private prescription costs. Understanding how pricing influences access through the NHS and private routes is important if you're considering this prescription-only weight management injection. This guide explains current UK pricing context, NHS eligibility pathways, and how costs vary between different access routes, so you can make an informed decision about your options.
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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.
NHS Access and Pricing for Mounjaro in the UK
NHS availability of Mounjaro varies significantly across the UK. NICE (National Institute for Health and Care Excellence) approved tirzepatide for use within NHS specialist weight management services, but access depends on your local Integrated Care Board (ICB) and tier 3 or tier 4 weight management service capacity. Many areas have extended waiting lists, meaning NHS prescription access can take months to years after your GP referral.
- NHS prescriptions are free once approved through a tier 3 specialist service
- Prescribing is subject to MHRA Black Triangle (▼) monitoring
- Regional variation means some ICBs offer tirzepatide while others do not
- Eligibility requires BMI ≥30, or ≥27 with weight-related health conditions
Check your local ICB website or ask your GP whether Mounjaro is available in your area. Pricing pressures on pharmaceutical budgets can affect whether your service funds this medication.
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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
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Private Prescription Costs and Access Routes
Private Mounjaro prescriptions are available through UK-licensed online prescribers and dispensed by GPhC-registered pharmacies. Private costs typically range from £129 to £320+ per month depending on your dose, as pricing reflects the pharmaceutical wholesale cost plus dispensing fees. Our free GLP-1 weight loss calculator can help you estimate your expected dose and understand potential progression costs. Unlike NHS routes, private prescriptions bypass waiting lists and offer faster access following an online clinical assessment by a UK-licensed prescriber.
- Private prescriptions are typically available within days, not months
- No NHS referral needed — direct access following clinical assessment
- Pricing varies by dose and provider — compare before committing
- 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.
Why has Mounjaro pricing been a concern in the UK?
Mounjaro pricing reflects NHS pharmaceutical budget pressures and global tirzepatide demand. When NICE approved tirzepatide for weight management, many regional NHS services had limited budgets to fund it, creating access barriers. Costs at the wholesale level and competition with other GLP-1 medications have influenced what services can afford, which is why many areas still have waiting lists or limited eligibility despite NICE approval.
Is Mounjaro cheaper on the NHS than privately?
Yes. NHS prescriptions are free once approved through a specialist tier 3 service. Private prescriptions cost £129–£320+ per month depending on dose. However, if NHS waiting times in your area are very long, private access may feel faster, even accounting for ongoing costs. Cost-benefit depends on your timeline and ability to pay privately.
How does Mounjaro pricing compare to Wegovy in the UK?
Both Mounjaro and Wegovy are available privately at similar price ranges (£129–£300+ per month) depending on dose and provider. NHS access for both depends on regional ICB budgets and service capacity. Clinical trial data showed different average weight loss outcomes — Mounjaro ~20.9% at maximum dose versus Wegovy ~14.9% — but individual results vary significantly.
What affects the cost of Mounjaro in private prescriptions?
Dose is the primary cost driver. Starting doses (2.5 mg) are typically cheaper than maintenance doses (15 mg maximum). Pharmacy dispensing fees, prescriber consultation fees, and individual provider pricing policies also affect total cost. Compare quotes across GPhC-registered pharmacies before purchasing, as prices vary.
Can I get Mounjaro free through the NHS if I'm eligible?
Potentially yes, but regional variation is significant. You'll need referral to a tier 3 specialist weight management service from your GP. Eligibility requires BMI ≥30 (or ≥27 with weight-related conditions) and assessment by the specialist team. Many areas have long waiting lists or budget constraints. Ask your GP whether tirzepatide is funded in your local ICB area.
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