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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Finding the Best Mounjaro Deal in the UK
If you're looking for a Mounjaro best deal in the UK, understanding your options — both NHS and private — is essential. Mounjaro (tirzepatide) is a prescription-only weight management injection available through specialist NHS services or private prescribing routes. Prices vary significantly depending on where you access it, your dose, and your eligibility. This guide explains how to navigate genuine pricing, avoid inflated costs, and find transparent options that suit your budget and health needs.
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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?
Mounjaro pricing in the UK varies considerably depending on your access route. Through NHS specialist weight management services, Mounjaro is typically free once prescribed — you only pay standard prescription charges (currently £9.90 per prescription in England). However, NHS access requires referral to a tier 3 or 4 specialist service, and availability varies significantly by region. Waiting times can be lengthy in many areas.
Through private online prescribing, costs typically range from £120 to £320 per month depending on your dose. Each KwikPen contains 4 weekly doses. Starting doses (2.5 mg) are usually cheaper than maximum doses (15 mg). Genuine GPhC-registered pharmacies provide transparent pricing with no hidden fees. Always check that the pharmacy is registered with the GPhC before purchasing — this is your assures that you're buying from a legitimate provider and receiving a genuine prescription-only medicine.
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.
Getting the Best Value Without Compromising Safety
The "best deal" on Mounjaro is not always the cheapest option. Legitimate prescriptions require a proper clinical assessment from a UK-licensed prescriber — this protects your health and ensures the medication is genuinely suitable for you. Extremely low prices should raise concerns about authenticity. Reputable private providers charge consistently across dose ranges and offer transparent pricing policies.
Use our free BMI calculator above to check your personal BMI — this determines your eligibility. If you're eligible, compare costs across registered UK pharmacies, check whether your prescriber offers ongoing support, and ask about repeat prescription discounts. NHS referral is still worth pursuing, even with waiting times, as it removes cost barriers entirely.
NHS vs Private Routes — Which Offers Better Value?NHS route: Free once prescribed (only standard prescription charges apply). No direct cost but significant waiting times (3–12 months in many areas). Available through specialist referral only.
Private route: Immediate access, no referral needed, costs £120–£320/month. Transparent pricing, ongoing prescriber support. Works well if you want to start immediately or prefer not to wait. Both routes require clinical assessment — never purchase Mounjaro without a prescription. The "best deal" depends on your timeline, budget, and preference for immediate vs. subsidised access.
- 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 privately?
Yes — once prescribed through NHS, you pay only standard prescription charges (£9.90 in England). Private costs range £120–£320/month. However, NHS access requires waiting for referral to specialist services, which can take months. If you can wait and are eligible, NHS is significantly cheaper. Private offers faster access at higher upfront cost.
How can I tell if a pharmacy is offering a genuine Mounjaro deal?
Check that the pharmacy is registered with the GPhC (General Pharmaceutical Council) — their register is searchable online. Legitimate providers offer transparent pricing, require a proper clinical assessment, and dispense genuine KwikPen devices. Be cautious of extremely low prices or offers that skip clinical assessment. GPhC registration is your safeguard.
Will my dose affect the price I pay for Mounjaro?
Yes. Starting doses (2.5 mg) are typically cheaper than maintenance doses (15 mg). Each KwikPen contains 4 weekly doses. As your dose increases during titration, the cost per pen usually increases. Ask pharmacies for pricing at each dose level — some offer discounts for repeat prescriptions or multi-month supplies.
Can I get Mounjaro on the NHS without paying?
Once prescribed through NHS specialist services, you pay standard prescription charges only (£9.90 per prescription in England, free in Wales/Scotland/Northern Ireland for eligible patients). However, NHS eligibility is assessed strictly, and waiting lists vary by region. Your GP can refer you to check eligibility.
What should I budget for if I choose private Mounjaro?
Budget £120–£320 per month depending on your dose level. Costs are front-loaded during titration (weeks 1–20) when you're changing dose weekly, then stabilise at maintenance dose. Factor in prescriber consultation fees (often £50–£150) and any follow-up support costs. Always confirm the total cost before starting treatment.
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.