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 in the UK?
Mounjaro (tirzepatide) pricing in the UK varies significantly depending on whether you access it through the NHS or private prescribing routes. If you're considering weight loss treatment, understanding the cost structure is essential. Prescription costs typically range from approximately £129 to £320 per month at private providers, though NHS access is also available in some regions through specialist services. This guide explains UK pricing, eligibility, and how to find the most cost-effective route for your circumstances. Use our free GLP-1 weight loss calculator to explore potential outcomes before making treatment decisions.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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.
NHS vs Private Mounjaro Access in the UK
NHS Access: Mounjaro has been approved by NICE for use within NHS specialist tier 3 weight management services. However, NHS access is limited and highly variable by region. Most patients require referral from their GP to a specialist weight management service, and waiting lists can extend to many months or years depending on your local Integrated Care Board (ICB). When available through the NHS, the medication is provided free at point of use, though you'll pay standard prescription charges if eligible (currently £11.65 per item in England).
Private Prescribing: Private online prescribing offers quicker access without NHS referral. After a clinical assessment with a UK-licensed prescriber, a prescription is issued and dispensed by a GPhC-registered pharmacy. Costs range from £129–£320 per month depending on your dose. The 2.5mg starting dose is typically the least expensive; costs increase with higher maintenance doses (5mg, 7.5mg, 10mg, 12.5mg, 15mg). Private access takes days to weeks rather than months, making it the faster route for many patients.
Check your personal BMI using our free BMI calculator to understand your eligibility and discuss options with your GP or a licensed prescriber.
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.
Finding the Best Price for Mounjaro in the UK
Pricing varies between private providers, so shopping around is worthwhile. Some online pharmacies offer loyalty schemes, multi-month discounts, or bundle pricing. However, the lowest price is only valuable if the service includes proper clinical support and follow-up. Ensure any provider is GPhC-registered and that prescriptions are issued by a UK-licensed doctor or nurse prescriber registered with the GMC or NMC. Be cautious of unusually low prices—these may indicate unregistered services, which pose safety and legal risks. Your GP may be able to prescribe Mounjaro privately (rather than NHS-funded) if you're not eligible for specialist services, which can sometimes be cost-effective. Always factor in the cost of regular blood tests and GP follow-ups when comparing total treatment costs.
- 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, Mounjaro (tirzepatide) is approved by NICE for NHS use through specialist tier 3 weight management services. However, availability is extremely limited and varies by region. Most patients face significant waiting lists (months to years). If you're eligible for NHS specialist services, the medication is provided free (standard prescription charges apply in England). Your GP can refer you to your local weight management service.
How much does Mounjaro cost privately in the UK?
Private Mounjaro costs range from approximately £129–£320 per month, depending on dose. The 2.5mg starting dose is less expensive than higher maintenance doses (5mg–15mg). Prices vary between GPhC-registered pharmacies, so it's worth comparing. Some providers offer discounts for multi-month purchases or loyalty schemes. Always use registered services with UK-licensed prescribers.
What is the difference between NHS and private Mounjaro?
The medication is identical either way. The difference is access speed and cost. NHS access is free (standard prescription charges) but involves waiting lists and specialist referral. Private prescribing is faster (days to weeks) and available without NHS referral, but costs £129–£320/month. Both require clinical assessment to confirm eligibility and safe use.
Can my GP prescribe Mounjaro privately for a fee?
Some GPs do offer private prescribing for Mounjaro, though this varies by practice. Private GP prescriptions may offer a middle ground between NHS waiting times and high private pharmacy costs. Contact your GP surgery to ask if they offer private weight management prescribing. Always confirm the prescriber is GMC-registered and the pharmacy is GPhC-registered.
What should I check before paying for Mounjaro online?
Verify the provider is GPhC-registered, the prescriber is UK-licensed (check GMC or NMC register), and the service includes clinical assessment and follow-up. Avoid unusually cheap offers, which may indicate unregistered services. Track your progress with our free progress tracker and maintain regular contact with your healthcare team while using Mounjaro.
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.