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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Best Deals on Mounjaro in the UK
If you're searching for Mounjaro deals in the UK, it's important to understand that this prescription-only medicine should only be obtained through legitimate, regulated channels. This guide explains NHS access, private prescription costs, and how to find affordable, safe options without compromising on clinical safety. Mounjaro (tirzepatide) is a once-weekly injection licensed for weight management in UK adults, but affordability depends on your eligibility route — NHS or private — and your individual health circumstances.
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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 Access in the UK: NHS vs Private Routes
NHS access to Mounjaro is free at point of use, but availability is limited and varies significantly by region. You'll need a referral from your GP to a tier 3 specialist weight management service. Eligibility criteria include a BMI of 30 or above, or 27–29.9 with weight-related health conditions like type 2 diabetes or hypertension. Once approved, you receive Mounjaro KwikPen through the NHS with no direct cost — though waiting lists can span months or years depending on your ICB (Integrated Care Board) area.
Private prescriptions are available through UK-licensed prescribers via regulated online services. Costs typically range from £129 to £320 per month depending on your dose. A 2.5 mg starter dose is usually cheaper than maximum 15 mg doses. Private access is faster — often within days — and doesn't require NHS referral, but you pay the full prescription fee. Always verify that any provider is GPhC-registered and uses qualified prescribers.
- NHS: Free but waiting lists common; regional variation
- Private: Fast access; cost varies by dose and provider
- Always use regulated, registered providers only
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.
Finding Affordable, Safe Mounjaro: What to Avoid
Never purchase Mounjaro from unlicensed sellers, social media offers, or unregistered online pharmacies — counterfeit medications are a genuine risk. Legitimate UK providers will always ask for a clinical assessment before prescribing, require a prescription from a UK-licensed doctor, and be registered with the GPhC (General Pharmaceutical Council). If a provider offers Mounjaro without any assessment or prescription, it's not legitimate.
The GLP-1 weight loss calculator on this page can help you estimate projected weight loss at different Mounjaro doses, giving you a better sense of value. If NHS access feels slow in your area, ask your GP about private routes — many GPs are aware of reputable private providers and can guide you. Some private services also offer payment plans to spread costs over months.
Budget-conscious options include starting on a lower dose (2.5 mg or 5 mg) privately to assess your response, then exploring NHS access for ongoing supply if you meet criteria. Some patients find the NHS KwikPen device more affordable long-term despite waiting times. Your GP can advise on the best value route for your specific situation. Remember that price is only one factor — clinical safety, legitimate prescribing, and genuine medication quality are non-negotiable.
- 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 cheaper on the NHS than private?
Yes — NHS provides Mounjaro free once approved, but waiting lists are often lengthy and availability varies by region. Private costs typically £129–£320 monthly depending on dose. If your NHS waiting list is short, NHS access offers better value. If you need it urgently and can afford private costs, private routes are faster.
What dose of Mounjaro is cheapest privately?
Starting doses (2.5 mg or 5 mg) are usually cheaper than maximum doses (15 mg). Dose titration happens gradually, so early treatment phases cost less. Ask your prescriber about your specific dose costs, which vary between providers.
Can I get Mounjaro without a prescription in the UK?
No. Mounjaro is prescription-only. Any seller offering it without a prescription is illegal and unsafe. Always use GPhC-registered pharmacies with qualified UK-licensed prescribers. Verify registration on the official GPhC register before proceeding.
Does Mounjaro vs Wegovy pricing differ in the UK?
Both are prescription-only with similar NHS access routes and comparable private costs. Mounjaro is a dual GIP/GLP-1 agonist; Wegovy is GLP-1 only. Price depends on dose and provider, not significantly on which medication. Ask your prescriber which suits your health profile and budget.
How can I check if a UK Mounjaro provider is legitimate?
Verify they're GPhC-registered (search the GPhC register online), require a clinical assessment before prescribing, ask for a UK-licensed prescriber's signature, and use regulated pharmacies. Legitimate providers always ask health questions and may decline to prescribe if unsuitable. Avoid providers with no assessment process.
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.