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
Black Friday Mounjaro Deals — UK Patient Information
Black Friday and seasonal sales events often attract searches for discounted Mounjaro, but it's important to understand how prescription medications actually work in the UK. Mounjaro (tirzepatide) is a prescription-only weight management injection that requires a clinical assessment before you can obtain it — it cannot simply be purchased at a discount like over-the-counter items. Whether you're looking to start treatment or already taking this medication, understanding UK pricing, prescription routes, and what genuine savings look like will help you make informed decisions about your weight management journey.
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.
How Mounjaro Pricing Works in the UK
Mounjaro is a prescription-only medicine, which means pricing and availability depend on how you access it — either through the NHS or privately. Through NHS specialist weight management services, Mounjaro is available to eligible patients at no cost (covered by the NHS). However, NHS access involves referral to tier 3 or 4 specialist services, and waiting times vary significantly by region — some areas have waiting lists measured in months or even years.
Private prescriptions through UK-licensed online pharmacies typically cost between £129 and £320 per month, depending on your dose. The KwikPen contains four weekly injections, so costs scale with dose progression. Doses range from 2.5 mg (starting) to 15 mg (maximum). Seasonal promotions occasionally offer discounted rates or bundle pricing, but these apply to the full prescription cost — there is no "discount" on the medication itself since it's a licensed pharmaceutical product.
- NHS route: free if eligible and referred through specialist services
- Private route: £129–£320/month depending on dose
- Pricing is consistent — significant discounts may indicate unlicensed or unsafe products
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.
What to Check When Looking at Mounjaro Offers
If you encounter promotional pricing for Mounjaro, always verify that the pharmacy is GPhC-registered (General Pharmaceutical Council) and that prescriptions are issued by UK-licensed healthcare professionals. Legitimate offers may include loyalty discounts on repeat prescriptions, bundle packages, or loyalty schemes — but the base cost remains regulated. Never purchase Mounjaro from unregistered online sellers, even if prices seem significantly cheaper. The medication must come with a valid UK prescription and be dispensed by a regulated pharmacy.
Before starting Mounjaro through any route, use our free BMI calculator to understand your current health status. A legitimate prescriber will assess your eligibility based on your BMI, health conditions, and medical history. They can also advise on realistic costs and whether NHS referral might be more appropriate for your situation.
- 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 cheaper on Black Friday?
Mounjaro pricing is regulated as a prescription medication. Legitimate UK pharmacies don't significantly discount licensed medications. Some may offer loyalty schemes or small discounts on repeat orders, but prices remain consistent (£129–£320/month depending on dose). Always verify the pharmacy is GPhC-registered. Very cheap offers may indicate unlicensed or unsafe products.
Is Mounjaro covered by the NHS?
Yes, Mounjaro is available free through NHS specialist weight management services if you meet eligibility criteria (BMI 30+ or 27+ with weight-related health conditions). However, NHS access requires GP referral to tier 3/4 services, and waiting times vary by region — often several months. Private prescriptions are available without NHS referral.
What's the difference between Mounjaro and other weight loss injections?
Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist. Wegovy (semaglutide) is a GLP-1 agonist only. Clinical trials showed Mounjaro achieved average weight loss of 15–21% body weight, while semaglutide achieved around 15%. Costs and availability differ between both options. Your prescriber can advise which suits your health profile.
Do I need a prescription to buy Mounjaro in the UK?
Yes, Mounjaro is prescription-only. You cannot legally purchase it without a valid UK prescription from a licensed healthcare professional. Private online prescribing services can issue prescriptions following an online assessment, but the prescription itself is mandatory. Never purchase without one.
What should I do if I can't afford Mounjaro privately?
If private costs are prohibitive, ask your GP about NHS referral to specialist weight management services. Although NHS waiting lists are long in many areas, it may eventually provide free access if you're eligible. In the meantime, evidence-based approaches like calorie deficit, increased physical activity, and behaviour change can support weight management alongside NHS tier 1 or 2 services.
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.