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
Mounjaro Discount Codes and UK Prescribing Costs Explained
There are no official discount codes for Mounjaro in the UK. However, if you're searching for ways to access this tirzepatide injection affordably, it's important to understand your options: NHS prescribing through specialist weight management services, or private prescribing through regulated online healthcare providers. This guide explains how Mounjaro costs work in the UK, who qualifies for NHS access, and what private prescriptions typically cost. Use our free GLP-1 weight loss calculator to explore potential outcomes before pursuing prescription routes.
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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.
NHS Access to Mounjaro and NICE Approval
NICE has approved tirzepatide (Mounjaro) for use in NHS specialist weight management services, but NHS access is limited and varies significantly by region. You cannot get Mounjaro on prescription from your GP directly — it must be prescribed by a tier 3 or tier 4 specialist weight management service. Your GP can refer you to these services if you meet eligibility criteria: BMI of 30 or above (or 27 or above with weight-related health conditions such as type 2 diabetes, hypertension, or cardiovascular disease).
For people of South Asian, Chinese, Black African, or Black Caribbean heritage, lower thresholds apply — eligibility may start at BMI 27.5. The issue is that NHS waiting lists for specialist weight management services can be months or even years in many areas of the UK. Regional variation in commissioning means some integrated care boards (ICBs) offer Mounjaro while others do not. Your GP can advise on local availability and refer you if appropriate.
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.
Private Prescribing: Cost, Access, and Regulation
If NHS waiting lists are too long or Mounjaro is not available in your area, private prescribing through a UK-registered online healthcare provider is an alternative. These services require an online clinical consultation with a UK-licensed prescriber, who will assess your medical history, eligibility, and suitability for treatment. If approved, your prescription is dispensed by a GPhC-registered pharmacy. Private Mounjaro costs typically range from £129 to £320 per month depending on your dose — this includes the prescription consultation and medication. Costs vary by provider, so it's worth comparing. Always verify that the provider is GPhC-regulated and that the prescriber is on the GMC or NMC register. Our free BMI calculator can help you confirm whether you meet current eligibility criteria before booking a consultation.
- 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 official Mounjaro discount codes or vouchers in the UK?
No. Mounjaro does not have official discount codes or manufacturer vouchers available in the UK. If you see promotional codes online, verify they come from a legitimate GPhC-registered pharmacy. Always check the regulator's website before providing payment details to any online provider.
How much does Mounjaro cost on the NHS?
Mounjaro is free on the NHS if prescribed through a specialist weight management service, but you must be referred by your GP and meet eligibility criteria. Availability varies by region. Contact your local integrated care board or ask your GP about tier 3 services in your area.
What's the difference between NHS and private Mounjaro prescriptions?
NHS prescriptions are free but access is limited by waiting lists and regional availability. Private prescriptions cost £129–£320/month but offer faster access without NHS referral. Both require a valid prescription from a UK-licensed prescriber and dispensing by a regulated pharmacy.
How do I get referred to an NHS Mounjaro service?
Speak to your GP about weight management services in your area. Your GP will assess your eligibility (BMI, health conditions, previous weight loss efforts) and refer you to tier 3 or tier 4 services if appropriate. Waiting times vary — ask your GP for an estimate.
Is Mounjaro the same as Wegovy?
Both are prescription weight loss injections available in the UK, but they're different medications. Mounjaro (tirzepatide) is a dual GIP and GLP-1 agonist. Wegovy (semaglutide) is a GLP-1 agonist only. NICE has approved both for weight management. Eligibility and costs differ — your prescriber will advise which is appropriate. ---END---
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.