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 Is Mounjaro Cheapest? Pricing Across Countries
Mounjaro (tirzepatide) pricing varies significantly across countries, but in the UK, cost depends on whether you access it through the NHS or private prescription. The NHS does cover Mounjaro through specialist weight management services, though availability varies by region. Private UK prescriptions typically range from £150–£300 per month depending on your dose. This guide explains UK pricing, NHS access, and why buying from abroad isn't recommended for safety and legal reasons.
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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.
How Much Does Mounjaro Cost in the UK?
NHS access: Mounjaro is funded by the NHS through tier 3 specialist weight management services, meaning if you're eligible and referred, there is no direct cost. However, NHS services face long waiting lists in many regions, and eligibility criteria are strict — typically requiring a BMI of 30 or above, or 27+ with weight-related health conditions.
Private UK prescriptions: Through GPhC-registered online pharmacies following clinical assessment, private Mounjaro costs vary by dose. A single KwikPen (4-week supply) ranges from approximately £150–£300 monthly, depending on whether you're on a 5mg, 10mg, or 15mg dose. Suppliers may offer discounts for bulk purchases or ongoing subscriptions. Always verify the pharmacy is regulated by the GPhC.
Your GP may also refer you privately while you wait for NHS services — ask about this option.
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.
Why International Purchasing Isn't Recommended
Although Mounjaro may be cheaper in some countries, purchasing from abroad carries significant risks. Medications may not meet UK safety standards, storage conditions during transit cannot be assured (Mounjaro requires refrigeration at 2–8°C), and you lose legal protections available with UK prescriptions. Counterfeit medications are a genuine concern with high-demand weight loss drugs. Additionally, importing prescription medicines into the UK without a UK prescription is illegal. The safest, most cost-effective route is securing a UK private prescription through a regulated online service or waiting for NHS referral to a specialist tier 3 weight management service in your area.
- 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?
Yes, Mounjaro is funded by the NHS through specialist tier 3 weight management services if you meet eligibility criteria (BMI 30+, or 27+ with weight-related health conditions). However, NHS availability varies significantly by region and waiting lists can be several months to over a year. Private prescription is often faster.
How much does a private Mounjaro prescription cost per month in the UK?
Private Mounjaro prescriptions through GPhC-regulated pharmacies typically cost £150–£300 per month per KwikPen (4-week supply), depending on your dose. Some providers offer subscription discounts. Always check the exact price for your dose before committing.
Can I legally buy Mounjaro from another country?
No. Importing prescription medicines into the UK without a valid UK prescription is illegal. Additionally, you lose consumer protections, cannot verify safety standards, and risk counterfeit products. Always obtain Mounjaro through a UK GP referral or regulated UK private prescriber.
What's the difference between NHS and private Mounjaro prescriptions?
NHS Mounjaro is free but requires referral to a specialist service and has longer waiting times. Private prescriptions are faster (often within days) but cost £150–£300 monthly. Both require a clinical assessment to confirm eligibility and suitability.
How can I check if a private Mounjaro provider is legitimate?
Verify the pharmacy is registered with the General Pharmaceutical Council (GPhC) — check the GPhC register online. Legitimate services require a clinical consultation with a UK-licensed prescriber, ask detailed health questions, and provide clear pricing before you commit.
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.