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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How to Get Mounjaro Affordably in the UK
If you're looking to get Mounjaro cheap in the UK, you have two main routes: NHS prescription through specialist services, or private online prescribing. Mounjaro (tirzepatide) is a prescription-only weight management injection that may help support weight loss alongside lifestyle changes. Costs vary significantly depending on which route you choose, your dose, and which provider you use. Understanding your options helps you find affordable access. Always consult your GP or a licensed prescriber to assess whether this medication is suitable for your individual 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.
Private vs NHS Routes for Mounjaro Access
NHS route: Mounjaro may be available through NHS specialist tier 3 weight management services, but access varies significantly by region and availability. You'll typically need a GP referral to your local specialist service. NHS prescriptions cost a standard prescription fee (currently £9.65 in England for most adults), making this the cheapest option if you can access it. However, waiting lists can be very long — sometimes months to years depending on your area.
Private route: Available through GPhC-registered online pharmacies following a clinical assessment with a UK-licensed prescriber. Private Mounjaro costs typically range from £129–£320 per month depending on your dose. The 2.5 mg starting dose tends to be cheaper than higher maintenance doses (10–15 mg). Private access is faster but more expensive than NHS. Some private providers offer subscription discounts for regular users, which may reduce the overall cost.
Compare costs and availability in your area by contacting your local NHS weight management service or exploring registered private providers.
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.
What Affects Mounjaro Cost in the UK
Dose level: Starting doses (2.5 mg) are cheaper than maintenance doses (10–15 mg). Since dose is increased gradually every 4 weeks, your early costs will be lower than long-term costs.
Prescription source: NHS prescription fees (£9.65) are much lower than private costs, but NHS waiting lists may be prohibitive. Private prescribing is faster but significantly more expensive.
Provider variation: Different private online pharmacies set different prices for the same dose. It's worth comparing registered providers to find the most competitive rate. Some providers bundle multiple months at a discount.
Use our free GLP-1 weight loss calculator to estimate potential results at different doses, which may help you decide if the investment is right for your goals.
- 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.
Can I get Mounjaro on the NHS for free?
Potentially yes — Mounjaro is approved by NICE for NHS specialist weight management services. However, availability varies significantly by region, and waiting lists can be very long (sometimes 1–2 years). You'll need a GP referral to your local tier 3 weight management service. When prescribed on the NHS, you pay the standard prescription fee (£9.65), not the full medicine cost. Contact your GP to ask about NHS availability in your area.
What's the cheapest private Mounjaro option?
The cheapest private Mounjaro option is typically the starting dose (2.5 mg), which may cost around £129–£150 per month. Some private providers offer discounts for 3-month or 6-month subscriptions. As you titrate up to higher doses (10–15 mg), monthly costs increase. Compare registered GPhC pharmacies for the best rates — prices vary between providers.
Is Mounjaro cheaper than Wegovy in the UK?
Mounjaro and Wegovy have similar price ranges through private providers (roughly £129–£320/month depending on dose). Mounjaro's maximum dose (15 mg weekly) may be slightly more expensive than Wegovy's maximum (2.4 mg weekly). Costs depend more on your individual provider and dose than on the medication type. Your prescriber can discuss which is more suitable for your health needs and budget.
What's the difference between cheap Mounjaro and expensive Mounjaro?
Price differences typically reflect dose level, not quality. A 2.5 mg pen costs less than a 15 mg pen from the same provider. Some private providers offer lower prices due to different business models or bulk purchasing. Always ensure you're buying from a GPhC-registered pharmacy — "cheap" Mounjaro from unregistered sources is unsafe and likely counterfeit.
Will Mounjaro cost less once I reach my goal weight?
Not necessarily. Mounjaro is typically continued long-term to maintain weight loss — stopping it often leads to weight regain. Cost will remain part of your ongoing healthcare budget if using private prescribing. Some users reduce their dose to the minimum effective level to lower costs. Your prescriber can advise on the best long-term approach for your health and budget.
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.