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 Access Mounjaro More Affordably in the UK
Finding cheaper Mounjaro in the UK depends on whether you access it through the NHS or privately. Mounjaro (tirzepatide) is available on the NHS through specialist tier 3 weight management services, though access varies significantly by region and waiting lists can be lengthy. Alternatively, private prescriptions are available at lower costs through online pharmacies following a clinical assessment. Understanding your eligibility and options can help you find the most affordable route. Use our free BMI calculator to check where you stand, and explore both NHS and private pathways to find what works best for your circumstances.
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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 and Eligibility for Mounjaro in the UK
Mounjaro is available through the NHS for eligible adults, but access is through specialist tier 3 weight management services rather than standard GP prescriptions. Eligibility criteria include a BMI of 30 kg/m² or above, or BMI 27–29.9 with weight-related health conditions such as type 2 diabetes, hypertension, or cardiovascular disease. For South Asian, Chinese, Black African, or Black Caribbean adults, lower BMI thresholds of 27.5 or above may apply due to higher health risks at lower weights.
The NHS route offers the advantage of no direct medication costs, but availability is limited. Access varies significantly by integrated care board (ICB) region — some areas have well-established specialist services while others have waiting lists of several months or years. Your GP can refer you to your local tier 3 service, though demand often exceeds capacity. When prescribed through the NHS, tirzepatide is the generic term used; Mounjaro kwikpen is the branded delivery device. The NHS typically starts patients at lower doses with careful dose titration, increasing gradually over weeks to minimise side effects.
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 Mounjaro Prescriptions — Cost and Access
Private Mounjaro prescriptions offer faster access and potentially lower total costs than NHS waiting lists, depending on your circumstances. Private prescriptions cost between approximately £129–£320 per month depending on the dose you're prescribed. Initial consultations with a UK-licensed prescriber typically cost £20–£50 and can often be completed online. Once prescribed, medication is dispensed by GPhC-registered pharmacies.
Private access does not require NHS referral or specialist service assessment — you can arrange a consultation directly and receive a prescription if clinically appropriate within days. This route suits those who cannot access NHS services quickly or live in areas with long waiting lists. To understand your potential costs and eligibility, use our GLP-1 weight loss calculator to explore projected outcomes at different doses, then compare with private prescriber pricing in your area.
- 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 or privately in the UK?
NHS Mounjaro is free to those eligible, but waiting times can be months or years. Private prescriptions cost £129–£320/month depending on dose. If NHS waiting lists are short in your area, NHS is cheaper overall. If waiting is lengthy, private may cost less when you factor in the time value.
How does Mounjaro compare to Wegovy in UK cost?
Both are available privately at similar costs (£129–£320/month). NHS access varies for both. Mounjaro and Wegovy differ in mechanism — Mounjaro is a dual GIP plus GLP-1 agonist, while Wegovy is GLP-1 only. Your prescriber will advise which is more suitable.
Can I get Mounjaro on prescription privately without NHS referral?
Yes. Private prescriptions are available following an online clinical assessment with a UK-licensed prescriber. You do not need to go through your GP or NHS tier 3 services. The prescriber will assess whether Mounjaro is appropriate based on your health.
What does the NHS NICE guidance say about Mounjaro for weight loss?
NICE has approved tirzepatide (Mounjaro) for use within NHS specialist weight management services. However, it is a tier 3 treatment — not routinely available in primary care. Specialist assessment is required, and regional availability varies due to NHS capacity constraints.
Are there payment plans or discounts for private Mounjaro prescriptions?
Some private pharmacies offer bulk discount pricing for multiple months' supply or payment plans. It's worth asking when you get a quote. Prices vary by pharmacy and dose, so comparing quotes from different GPhC-registered providers can help you find the best value. ```
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.