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
Monjaro Prices in the UK — What You Need to Know
Monjaro (tirzepatide) pricing in the UK varies significantly depending on whether you access it through the NHS or private prescription. NHS access is free at the point of use for eligible patients, but availability is limited and varies by region. Private prescriptions through online UK pharmacies typically cost between £130–£320 per month depending on your dose. This guide explains NHS eligibility, waiting times, and private costs so you can understand your options. Use our free GLP-1 weight loss calculator to explore potential outcomes at different doses.
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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 Monjaro — Eligibility and Costs
NHS Monjaro is free at the point of prescription if you meet eligibility criteria, but access is through specialist tier 3 weight management services, not standard GP prescription. You must be referred by your GP and meet strict BMI thresholds: BMI of 30 kg/m² or above (or 27–29.9 with weight-related health conditions including type 2 diabetes, prediabetes, high blood pressure, or cardiovascular disease). For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, lower thresholds apply (BMI 27.5 or above).
However, NHS availability is severely limited. Most regions have long waiting lists (sometimes 12–24 months or longer), and some ICBs (integrated care boards) have paused new Monjaro referrals due to demand. NICE has approved tirzepatide for use in NHS specialist services, but funding and availability depend entirely on your local health authority. Your GP can check eligibility and referral pathways for your area.
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 Monjaro Costs — What to Expect
Private prescription costs for Monjaro (tirzepatide) in the UK typically range from £130–£320 per month depending on your dose and the pharmacy provider. Starting doses (2.5 mg) are usually at the lower end; maintenance and higher doses (10–15 mg) are typically £240–£320. A three-month supply can cost £400–£900+. Prices include the prescription fee and pharmacy dispensing but do not include GP consultation if needed.
Private access is through GPhC-registered online pharmacies following an online clinical assessment with a UK-licensed prescriber. No NHS referral is needed. This means you can access treatment more quickly than NHS waiting lists, but you pay out-of-pocket. Many people use a private route when NHS waiting times are unacceptable.
- Check multiple providers — prices vary slightly
- Ask about repeat prescription discounts
- Confirm the dose and number of pens included
- 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 Monjaro free on the NHS?
Monjaro is free on the NHS for eligible patients (BMI 30+ or 27+ with health conditions), but only through specialist tier 3 weight management services following a GP referral. Availability is extremely limited with long waiting lists (often 12+ months). Check with your GP whether your local NHS service is accepting new referrals.
How much does Monjaro cost privately in the UK?
Private Monjaro costs typically £130–£320 per month depending on dose. Starting doses (2.5 mg) cost around £130–£150; higher doses (10–15 mg) cost £240–£320+. This includes the prescription and pharmacy fees but not GP consultation fees if needed separately.
What's the difference between NHS and private Monjaro?
The medication is identical. The difference is access: NHS is free but involves GP referral, specialist assessment, and potentially long waiting lists. Private requires online clinical assessment and out-of-pocket payment but offers faster access. Both require a valid prescription from a UK-licensed prescriber.
Can I get Monjaro through my GP directly?
Not typically. GPs cannot prescribe Monjaro for weight management in standard primary care. You need referral to a specialist tier 3 weight management service through the NHS, or private online prescribing. Only in very rare cases with complex medical history might a GP consider it.
Does private Monjaro require a prescription?
Yes, absolutely. Monjaro is prescription-only medication in the UK, whether NHS or private. Private prescriptions are issued by a UK-licensed prescriber following an online clinical assessment. You cannot legally obtain Monjaro without a valid UK prescription.
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.