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
How To Get Mounjaro Cheaper in the UK
If you're considering Mounjaro (tirzepatide) for weight management in the UK, cost is often a significant factor. The prescription-only injection can be expensive through private prescribing, with costs typically ranging from £150 to £300+ per month depending on dose. There are several strategies to reduce what you pay, from NHS access to timing your treatment and using our free GLP-1 weight loss calculator to project outcomes before committing to costs.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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 vs Private Routes
The most cost-effective way to access Mounjaro in the UK is through the NHS, where it's available free through specialist tier 3 weight management services — but availability varies significantly by region and waiting lists can be lengthy. NICE approved tirzepatide for NHS use in 2024, meaning eligible adults can access it without paying. To pursue NHS access, ask your GP for referral to your local specialist weight management service. Private prescribing typically costs £150–£300 per month depending on dose and provider, with some online pharmacies offering packages discounts or subscription plans. If pursuing private treatment, compare providers carefully — costs vary between GPhC-registered pharmacies, and some offer dose-stacking savings where higher doses cost marginally more.
- NHS route: Free but regional variation and waiting lists — ideal if you can wait
- Private online prescribing: Faster access (usually 24–48 hours) but ongoing monthly costs
- Hybrid approach: Start private while waiting for NHS appointment, then transfer if approved
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.
Strategies To Reduce Your Mounjaro Costs
Start at the lowest dose (2.5 mg) and titrate slowly — you don't need to jump to higher doses immediately. Clinical data shows meaningful weight loss at 5 mg doses, so staying at lower effective doses longer reduces total medication spend. Many people stabilise results at 5–10 mg rather than the maximum 15 mg, potentially halving costs compared to those who escalate rapidly. Track your progress using our free progress tracker to document whether higher doses actually improve your results — you may find lower doses are equally effective for you. Some private providers offer savings on multi-month supplies or subscription discounts, so asking about bundle pricing is worthwhile. If NHS access becomes available in your area, switching can eliminate costs entirely.
- 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?
Yes — Mounjaro is completely free through NHS specialist weight management services if you're eligible. However, NHS access depends on your regional availability and referral pathway. Waiting lists can be several months in many areas, so some people pursue private treatment initially while waiting. Ask your GP about NHS tier 3 referral to explore free options.
What's the difference between Mounjaro and Wegovy pricing?
Both are prescription-only and cost similarly through private prescribing (typically £150–£300/month). Mounjaro uses less frequent dosing (once weekly from 2.5 mg) and clinical trials show slightly higher average weight loss (~21% vs ~15% for Wegovy). Some people find Mounjaro more cost-effective per dose, but individual results vary and prescriber availability differs.
Can I get a cheaper generic version of tirzepatide?
Not currently in the UK. Mounjaro (tirzepatide) is still under patent protection, and no generic versions are yet available. Prescription costs are set by the manufacturer and pharmacies. Your options are NHS access, private prescribing from different providers, or exploring Wegovy or Saxenda as alternative GLP-1 medications.
Will my private GP prescription be cheaper if I buy elsewhere?
Prescriptions are transferable to different pharmacies — once you have a private prescription, you can compare prices between GPhC-registered pharmacies. Some charge £150–£180 per month while others charge £250+, so shopping around is worthwhile. Always verify the pharmacy is GPhC-registered and requires proper clinical assessment.
Is dose titration a way to save money on Mounjaro?
Yes — starting at 2.5 mg and titrating slowly (every 4 weeks) costs less initially and allows you to find your effective dose without jumping to expensive higher doses. Many people achieve good results at 5–10 mg, avoiding the cost of escalating to maximum dose. Use our GLP-1 weight loss calculator to estimate outcomes at different doses before escalating.
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.