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 to Get Mounjaro Cheap in the UK
Mounjaro (tirzepatide) can be accessed in the UK through both NHS specialist services and private prescription routes, with costs varying significantly between the two. While there's no single "cheapest" way to get Mounjaro, understanding your options — NHS waiting lists versus private online prescriptions — helps you find the most affordable and accessible route for your situation. This guide explains UK pricing, how to qualify, and what to expect from each pathway.
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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 UK Pricing and Private Prescription Costs
Private prescription costs for Mounjaro in the UK typically range from £100 to £300 per month, depending on your dose and the provider. A single KwikPen (containing 4 weekly doses) costs between £120 and £250, though prices vary by registered online pharmacy and whether you're starting on the lower 2.5 mg dose or escalated to higher maintenance doses like 10 mg or 15 mg. Initial consultations usually cost £40–£80, and some providers offer package deals that reduce per-dose costs if you commit to ongoing treatment.
- Starting doses (2.5–5 mg) are typically cheaper per pen than maximum doses (15 mg)
- Some private providers offer loyalty discounts or subscription pricing
- Prescription fees from UK-licensed prescribers are usually included in the quoted price
- NHS prescription charges do not apply to private prescriptions
To find more affordable options, compare registered GPhC-regulated online pharmacies, check whether bundle pricing is available, and confirm that the initial consultation fee is clearly disclosed before committing.
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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: Which Route Is Cheaper?
The NHS route is free at point of use once prescribed through a tier 3 specialist weight management service, but access is limited and waiting lists can be months or years in many regions. Private prescription costs money upfront but offers immediate access without referral delays. Calculate your personal BMI using our free BMI calculator to understand whether you meet NHS eligibility criteria (BMI ≥30, or ≥27 with weight-related health conditions), then discuss both routes with your GP — they can advise on local NHS availability and whether private prescription might suit your timeline better.
- NHS: free but slow access; availability varies by region
- Private: immediate access; costs £100–£300 per month depending on dose
- Online consultations: typically £40–£80 one-time fee, prescription included
- 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.
Can I get Mounjaro for free on the NHS in the UK?
Yes, if prescribed through an NHS tier 3 specialist weight management service. However, NHS access is limited and waiting lists are often long (months to years depending on region). You must be referred by your GP and meet BMI eligibility criteria. Not all areas have fully funded services. Contact your local Integrated Care Board to check availability in your area.
How much does Mounjaro cost on private prescription in the UK?
Private Mounjaro costs typically range from £120 to £250 per KwikPen (4 weeks of doses), plus an initial consultation fee of £40–£80. The total monthly cost is usually £150–£300 depending on your dose and provider. Prices vary between registered online pharmacies, so comparing providers can help you find better rates.
What's the difference between Mounjaro and Wegovy in terms of UK cost?
Both are similarly priced on private prescription (£100–£300/month), though Mounjaro typically costs slightly more due to its higher maximum dose (15 mg vs Wegovy's 2.4 mg). Starting doses are cheaper than maintenance doses for both medications. Your GLP-1 weight loss calculator can help estimate costs at different dose levels.
Is there a generic or cheaper version of Mounjaro available in the UK?
No generic tirzepatide is currently available in the UK. Mounjaro is brand-name only and there's no cheaper alternative medication with identical properties. However, Wegovy (semaglutide) offers similar results and costs comparably. Your prescriber can discuss which medication offers better value for your situation.
How can I reduce Mounjaro costs if buying privately?
Compare prices across registered GPhC-regulated online pharmacies, ask about package deals for longer treatment courses, confirm consultation fees are included, and check whether starting on lower doses (2.5–5 mg) rather than jumping to maintenance doses suits your budget. Some providers offer loyalty pricing or seasonal discounts.
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.