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 Monjaro in the UK
Getting Monjaro (tirzepatide) in the UK is possible through two main routes: NHS specialist weight management services or private online prescription following a clinical assessment. This guide explains how each route works, what Monjaro costs, and what to expect. Monjaro is a once-weekly GLP-1 receptor agonist injection licensed for weight management in UK adults with a BMI of 30 or above, or 27 or above with weight-related health conditions. Access varies significantly depending on which route you choose and where you live.
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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.
Monjaro Cost and Private Access in the UK
Private Monjaro costs in the UK typically range from £129 to £320 per month, depending on your dose and the online pharmacy provider. The standard progression is: 2.5 mg (starting dose), 5 mg, 7.5 mg, 10 mg, 12.5 mg, and 15 mg (maximum dose) — each dose is a once-weekly injection delivered via a pre-filled KwikPen device. Each pen contains four doses (four weeks supply).
- Lower doses (2.5–5 mg) typically cost £129–£180 per month
- Mid-range doses (7.5–10 mg) typically cost £180–£250 per month
- Higher doses (12.5–15 mg) typically cost £250–£320 per month
You will need a prescription from a UK-licensed prescriber following an online clinical assessment. Most private providers charge a consultation fee (£20–£50) which is sometimes waived if you proceed with treatment. Private access does not require an NHS referral to specialist services — you can access treatment immediately after assessment.
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.
NHS vs Private Access Routes
The NHS route requires referral from your GP to a tier 3 specialist weight management service. NHS Monjaro is free, but waiting lists can be very long — in many areas, waits exceed 12–18 months. Availability varies significantly by region (Integrated Care Board). The private route offers faster access (usually within days), no waiting list, and no need for NHS referral, but you pay the full cost. Many people choose private prescription because NHS waiting times are prohibitive. To start private treatment, you'll complete an online consultation assessing your BMI, medical history, and weight-related conditions. A prescriber will decide if Monjaro is suitable for you, then issue a prescription to be dispensed by a GPhC-registered pharmacy.
- 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.
How much does Monjaro cost privately in the UK?
Private Monjaro costs between £129–£320 per month depending on your dose. Starting doses (2.5–5 mg) are cheaper at around £129–£180/month. Maximum doses (12.5–15 mg) cost £250–£320/month. You pay per monthly pen delivery, and costs vary slightly by provider.
Can I get Monjaro free on the NHS?
Yes, Monjaro is available free through NHS tier 3 specialist weight management services, but you must be referred by your GP and may wait 12–18+ months. Private access is faster (days to weeks) but you pay the full cost. Your GP can advise on NHS referral options in your area.
What happens during a private online consultation for Monjaro?
You complete a health questionnaire covering your BMI, medical history, weight-related conditions (diabetes, high blood pressure, etc.), current medications, and allergies. A UK-licensed prescriber reviews this and decides if Monjaro is suitable. If approved, they issue a prescription to a GPhC-registered pharmacy for dispensing.
Do I need a GP referral to get Monjaro privately?
No. Private prescription routes do not require a GP referral. You access treatment directly through an online prescriber assessment. Your GP does not need to be involved unless you choose to inform them, though this is recommended for safety monitoring.
Is Monjaro the same as Ozempic or Wegovy?
No. Monjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist — different from Wegovy (semaglutide), which is a GLP-1 agonist only. Ozempic is semaglutide for diabetes, not approved for weight management. All three are prescription-only, but Monjaro and Wegovy are specifically licensed for weight management in the UK.
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.