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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Where to Find the Cheapest Mounjaro Online in the UK
Mounjaro (tirzepatide) is available in the UK through both NHS specialist weight management services and private online prescribing. If you're looking for the most affordable option, it's important to understand how UK pricing works, what affects the cost, and whether you're eligible for NHS access. This guide breaks down real Mounjaro costs, where to access it, and how to find the best value for your situation.
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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.
Understanding Mounjaro Pricing in the UK
Mounjaro is a prescription-only medicine available through two main routes in the UK: NHS specialist services and private online prescribing. On the NHS, Mounjaro is provided free once you're accepted onto a tier 3 or 4 weight management service — however, access is highly variable by region and waiting lists can be very long (sometimes 12+ months in some areas).
Private Mounjaro pricing ranges from approximately £129 to £320 per month depending on your dose. Pricing typically breaks down as: starting doses (2.5–5 mg) around £129–£149/month; mid-range doses (7.5–10 mg) around £180–£220/month; and maximum doses (12.5–15 mg) around £270–£320/month. These prices usually include the online clinical assessment, prescription, and one Mounjaro KwikPen (which contains 4 weeks of doses). Some providers offer discounts for upfront payment of multiple pens.
- NHS access: free but subject to regional availability and waiting lists
- Private access: £129–£320/month depending on dose and provider
- Each KwikPen lasts 4 weeks (one injection per week)
- Dose titration takes 20+ weeks, so budget for multiple pens over time
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 Find Affordable Mounjaro Online
To access Mounjaro as cheaply as possible, start by asking your GP about NHS referral to a specialist weight management service — this is always the cheapest route if you can access it, though waiting times vary widely. If you need to access Mounjaro privately, compare prices across GPhC-registered online pharmacies that offer tirzepatide prescriptions. Prices do vary between providers, so it's worth checking a few. Some pharmacies offer bulk discounts if you order multiple pens upfront, which can reduce the per-pen cost slightly.
Remember that the cheapest option isn't always the best — ensure any provider offers a proper clinical assessment (not just an instant prescription) and that your prescription comes from a UK-licensed prescriber. Use our free GLP-1 weight loss calculator to estimate your potential results at different doses, and use our BMI calculator to confirm your eligibility before starting treatment.
- 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 for free in the UK?
Yes, Mounjaro is available free on the NHS through specialist tier 3/4 weight management services. However, access varies significantly by region (ICB), and waiting lists can be very long — sometimes 12+ months. Ask your GP about referral to your local specialist weight management service. You must meet NHS eligibility criteria (BMI ≥30, or ≥27 with weight-related health conditions).
What's the cheapest way to buy Mounjaro online in the UK?
The cheapest way is NHS access (free), but if waiting lists are too long, private online prescribing costs £129–£320/month depending on dose. Compare prices across GPhC-registered pharmacies. Some offer discounts for buying multiple pens upfront. Always ensure the prescriber is UK-licensed and conducts a proper clinical assessment.
How much does a Mounjaro KwikPen cost?
Private pricing per pen ranges from £129–£320 depending on the dose (2.5 mg to 15 mg). Each pen contains 4 weekly injections. Since dose titration takes 20+ weeks, you'll need multiple pens over the treatment journey, so budget accordingly. Bulk purchasing may offer small discounts.
Can I get Mounjaro cheaper by switching from Wegovy?
Pricing is separate for each medication. Mounjaro and Wegovy (semaglutide) are both available privately in the UK at similar cost ranges. Mounjaro uses a dual GIP+GLP-1 mechanism, while Wegovy is GLP-1 only. Some private providers offer both — compare their pricing directly. Clinical results vary between individuals.
Is there a generic cheaper version of Mounjaro available in the UK?
No generic tirzepatide is currently available in the UK — Mounjaro is the only brand-name version. Patents protect the medication until 2032. Your only options are NHS access or private prescription of branded Mounjaro. Ensure any provider is GPhC-registered and legitimate.
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.