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
Free Discount Codes For Mounjaro — What You Need To Know
There are no official free discount codes for Mounjaro in the UK — the medication is prescription-only and supplied through regulated pharmacies following a clinical assessment. However, understanding Mounjaro's actual costs, NHS access routes, and how it compares to Wegovy (semaglutide) can help you make informed decisions about weight management options. Both medications require a GP or licensed prescriber assessment before you can access them, whether through NHS specialist services or private prescription.
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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 Mounjaro Costs Compare To Wegovy In The UK
Mounjaro (tirzepatide) and Wegovy (semaglutide) are both prescription-only GLP-1 weight loss injections available in the UK, but they operate through different supply models. Neither medication offers official promotional discount codes — pricing is regulated by the MHRA and set by dispensing pharmacies. Private prescription costs typically range from £129–£320 per month depending on dose, with Mounjaro's maximum dose (15 mg) generally costing more than Wegovy's maximum (2.4 mg). NHS access to both medications is through specialist tier 3 weight management services, not standard GP prescription. Mounjaro is a dual GIP and GLP-1 receptor agonist (activating two hormone pathways), whilst Wegovy is a GLP-1 agonist only (single pathway). Clinical trial data from SURMOUNT (Mounjaro) showed average weight loss of approximately 15–21% body weight, whilst STEP trials (Wegovy) showed approximately clinically studied weight loss — though individual results vary significantly.
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.
Which Medication Might Be Right For You?
Choosing between Mounjaro and Wegovy depends on individual health factors, prescriber recommendation, and personal response — not on discount codes, since neither has promotional pricing in the UK. Your GP or licensed prescriber will assess your eligibility based on BMI, weight-related health conditions, and medication history. Both require a clinical assessment before prescription. Use our free GLP-1 weight loss calculator above to explore projected outcomes at different doses, and our BMI calculator to check your starting point. Access through NHS specialist services may have waiting lists; private prescription is available without NHS referral but requires payment. Whichever path you choose, weight loss medications work best alongside reduced-calorie diet and increased physical activity.
- 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 discount codes for Mounjaro in the UK?
No. Mounjaro is a prescription-only medicine regulated by the MHRA, so there are no official promotional discount codes or vouchers. Pricing is set by dispensing pharmacies and varies by dose and provider, typically £129–£320 monthly. Always purchase through a GPhC-registered pharmacy following a valid prescription from a UK-licensed prescriber.
How does Mounjaro's cost compare to Wegovy?
Both medications vary in price depending on dose and pharmacy. Mounjaro's maximum dose (15 mg) typically costs slightly more than Wegovy's maximum (2.4 mg). Private costs range £129–£320/month for either. NHS access is free but through specialist services with varying availability. Compare doses with your prescriber to understand actual cost.
Can I get Mounjaro free on the NHS?
Yes, if prescribed through NHS specialist tier 3 weight management services. However, NHS availability varies significantly by region (ICB). Many areas have long waiting lists. You must be referred by your GP and meet eligibility criteria (BMI ≥30 or ≥27 with weight-related health conditions). Ask your GP about your local NHS weight management pathway.
What's the difference between Mounjaro and Wegovy?
Mounjaro (tirzepatide) is a dual GIP+GLP-1 receptor agonist activating two hormone pathways. Wegovy (semaglutide) is a GLP-1 agonist only. SURMOUNT trials showed Mounjaro average weight loss of 15–21% body weight; STEP trials showed Wegovy approximately 15%. Both are once-weekly injections. Your prescriber will recommend the most suitable option based on your health profile.
How do I access Mounjaro or Wegovy in the UK?
NHS route: referral from your GP to specialist tier 3 weight management services. Private route: online consultation with a UK-licensed prescriber through a GPhC-registered pharmacy. Both require clinical assessment. Neither medication is available without a prescription. Compare NHS waiting times with private costs to choose the best path for you.
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.