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
Where to Find the Cheapest Mounjaro in the UK
Mounjaro (tirzepatide) costs vary significantly depending on whether you access it through the NHS or privately. If you're looking for the most affordable option, understanding the available routes is essential. The NHS may offer free prescriptions if you qualify for specialist weight management services, whilst private prescriptions typically cost between £129 and £320 per month depending on your dose. This guide explains how to find the cheapest Mounjaro in the UK and what factors affect pricing.
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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.
NHS vs Private Mounjaro Pricing
NHS route: Completely free if prescribed through a tier 3 or tier 4 specialist weight management service. However, access varies dramatically by region (Integrated Care Board), and waiting lists can be very long — sometimes months or years. You'll need a GP referral to access NHS specialist services.
Private route: Available through GPhC-registered online pharmacies following an online clinical assessment. Costs depend on your dose and provider, typically ranging from £129–£320 monthly. Private access is faster but requires payment. The GIP receptor agonist mechanism in Mounjaro (combined with glp-1 receptor agonist activity) helps regulate appetite and blood sugar, supporting weight loss across all doses.
Your local NHS availability is the biggest factor affecting cost — check with your GP about tier 3 services in your area first, as free prescription is the cheapest option if you qualify.
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.
How to Access Cheapest Mounjaro
Start with your GP to discuss eligibility for NHS specialist weight management services — this is free if available in your area. If waiting times are too long or you don't meet local NHS criteria, private online prescribing offers faster access. Prices are most competitive with providers offering subscription or bulk-dose discounts. Compare prices across mounjaro kwikpen options and ensure any provider you use is GPhC-registered. Many private providers offer the same clinical assessments as NHS services but without the wait. Using our GLP-1 weight loss calculator can help you understand potential outcomes at different doses, which may influence your cost-benefit 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.
What's the cheapest way to get Mounjaro in the UK?
The NHS route is free if you qualify and can access tier 3 specialist weight management services through your GP. Private online prescriptions cost £129–£320/month depending on dose. NHS access varies by region — check availability with your GP first.
Why does Mounjaro cost more than Wegovy?
Mounjaro uses a dual GIP and GLP-1 mechanism versus Wegovy's single GLP-1 action. Clinical trials show Mounjaro produces slightly higher average weight loss, which may justify the cost difference. Individual results vary, and both require prescription.
Are there subscription discounts for cheaper Mounjaro?
Some private providers offer subscription plans or discounts for multiple doses upfront. Always check the provider is GPhC-registered and ask about any available discounts before purchasing.
Can I use my NHS prescription exemption with private Mounjaro?
No. Private prescriptions are separate from NHS exemptions. If you have an NHS prescription from a specialist service, it's free. Private prescriptions are always paid for by you.
Is cheaper Mounjaro safe from online pharmacies?
Yes, if the pharmacy is GPhC-registered. Verify the pharmacy's registration on the GPhC website. All registered UK pharmacies follow the same safety and quality standards, regardless of price differences.
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.