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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Mounjaro Discount Codes & UK Pricing Guide
There are no official "free discount codes" for Mounjaro in the UK — tirzepatide is a prescription-only medication available through NHS specialist services or private online prescribing. Understanding the real costs, eligibility requirements, and how to access this weight management injection through both NHS and private routes will help you make an informed decision. This guide covers actual UK pricing, what affects cost, and how the prescription process works.
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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.
UK Mounjaro Costs & Private Prescription Pricing
Mounjaro is not available through discount codes or vouchers in the UK. Instead, costs depend on which route you choose: NHS or private.
Private prescription costs: Mounjaro through private online prescribing typically ranges from approximately £130–£320 per month depending on your dose, the KwikPen strength, and the prescribing service. A full KwikPen contains 4 weeks of injections (four doses). Your starting dose (2.5 mg) is usually the most affordable, while higher maintenance doses (10 mg or 15 mg) cost more. Some private prescribers offer packages discounting bulk orders or longer treatment courses, though these are arrangement-specific, not official vouchers.
- Starting dose (2.5 mg) — typically £130–£160/month
- Maintenance doses (5–10 mg) — typically £180–£240/month
- Maximum dose (15 mg) — typically £280–£320/month
Private costs also include the online clinical assessment fee (usually £20–£50), which is a one-time charge. Prices vary by provider but all must be GPhC-registered pharmacies with UK-licensed prescribers. Always check the total cost upfront, including consultation fees, before committing.
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.
NHS vs Private: How to Access Mounjaro in the UK
NHS access: NICE has approved tirzepatide for weight management within NHS specialist tier 3/4 services. However, NHS availability is extremely limited and varies dramatically by region (ICB). Many areas have months-long waiting lists. You must be referred by your GP to a specialist weight management service — you cannot request Mounjaro directly. Not all NHS areas offer it yet.
Private access: Available now without NHS referral through GPhC-registered online prescribing services. You complete an online health questionnaire, have a consultation with a UK-licensed prescriber, and receive a prescription if clinically suitable. Prescriptions are dispensed by registered UK pharmacies. The entire process typically takes 24–48 hours. Use our free GLP-1 weight loss calculator to estimate potential results and our BMI calculator to check your eligibility before consulting a prescriber.
- 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.
Are there any official Mounjaro discount codes or NHS free prescriptions available?
No official discount codes exist for Mounjaro in the UK. NHS prescriptions are free on the NHS (as with all NHS medicines) but availability is very limited and varies by region. Private prescriptions cost approximately £130–£320/month depending on dose. Some private services may offer package deals but these are provider-specific, not nationwide vouchers.
Why is Mounjaro so expensive privately compared to NHS prescriptions?
NHS prescriptions cost £9.90 (or nothing if you qualify for exemptions). Private costs cover the prescription fee, prescriber consultation, pharmacist dispensing, clinical assessment, and the manufacturer's medicine cost. Private services also involve higher overhead. NHS access is free but severely limited by availability and waiting lists.
How do I get the lowest Mounjaro cost in the UK?
Starting with the lowest dose (2.5 mg) costs less per month than higher doses. If waiting for NHS access is viable in your area, this is free once approved. Privately, comparing prices across different registered online prescribing services may save money — costs vary. Some services offer discounts for longer-term commitment or bulk orders, though you must verify they're legitimate, registered providers.
What's included in the £130–£320 monthly cost for private Mounjaro?
The cost typically covers the KwikPen (4 weekly injections), the prescriber consultation fee, dispensing pharmacy fee, and clinical assessment. Some services bundle these; others itemise them separately. Always ask for a full breakdown upfront. The initial consultation is often charged separately (£20–£50). Subsequent months may be lower if the consultation is a one-time fee.
How long does the private prescription process take from consultation to receiving Mounjaro?
Most GPhC-registered online services complete the process within 24–48 hours. You complete a health questionnaire (10–15 minutes), have a brief consultation with a UK-licensed prescriber (often same-day), receive your prescription, and the pharmacy dispatches the KwikPen. Some services offer next-day delivery. NHS routes typically involve waiting lists of weeks to months before even starting assessment.
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.