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 Online in the UK
If you're looking for information about accessing Mounjaro (tirzepatide) in the UK, you have two main routes: NHS specialist weight management services or private online prescription through a licensed UK prescriber. This guide explains your options, eligibility criteria, and what to expect from each pathway. Both routes require a clinical assessment before Mounjaro can be prescribed — there is no pharmacy that will dispense it without a valid prescription.
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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 Mounjaro and NICE Approval in the UK
NICE (National Institute for Health and Care Excellence) has approved tirzepatide (Mounjaro) for use within NHS specialist weight management services. Access is typically through tier 3 or 4 multidisciplinary weight management services, not standard GP prescriptions. You'll need a referral from your GP to access these services, and eligibility includes adults with BMI of 30 or above, or 27–29.9 with weight-related health conditions such as type 2 diabetes, high blood pressure, or sleep apnoea.
However, NHS waiting lists for specialist weight management services are lengthy in many areas — some regions report waits of 12–18 months or longer. This is why many UK adults turn to private routes for faster access. On the NHS, if Mounjaro is prescribed, your GP may manage ongoing reviews, though this varies by integrated care board (ICB) and local commissioning.
Use our free BMI calculator above to check your eligibility range, and try our GLP-1 weight loss calculator to explore potential outcomes at different tirzepatide doses.
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 Online Mounjaro Access and Cost in the UK
Private online prescribers in the UK can assess your eligibility and issue a Mounjaro prescription without an NHS referral. This typically involves a brief online consultation with a UK-licensed doctor or nurse prescriber, who will review your medical history and assess suitability. If approved, your prescription is dispensed by a GPhC-registered online pharmacy, usually within 24–48 hours.
Private costs typically range from £129 to £320 per month depending on your dose (starting at 2.5 mg, up to 15 mg maximum). You pay per KwikPen device, which contains four weekly injections. Private access is faster than NHS — assessment and delivery often within 1–2 weeks — but requires you to cover the full medication cost. Your GP can still provide ongoing clinical reviews and blood tests to monitor your health during private treatment.
- 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 in the UK?
Yes, Mounjaro (tirzepatide) is approved by NICE for use within NHS specialist weight management services. You'll need a GP referral to tier 3 or 4 services and meet eligibility criteria (BMI ≥30, or ≥27.5 with weight-related health conditions). However, NHS waiting lists are typically 6–18 months long depending on your region, which is why many people choose private access.
What's the difference between NHS and private access to Mounjaro?
NHS access is free but involves long waiting lists and requires a GP referral to specialist services. Private access is faster (1–2 weeks) and doesn't require NHS referral, but costs £129–£320 per month per dose. Both routes require clinical assessment and a valid prescription — no pharmacy dispenses Mounjaro without one.
What eligibility criteria do I need to meet for Mounjaro?
Adults with BMI of 30 kg/m² or above qualify. Those with BMI 27–29.9 may qualify if they have weight-related health conditions (type 2 diabetes, high blood pressure, sleep apnoea, or cardiovascular disease). South Asian, Chinese, Black African, and Black Caribbean adults may qualify at lower BMI thresholds. Your prescriber will assess individual suitability.
How much does Mounjaro cost privately in the UK?
Private Mounjaro costs range from approximately £129 to £320 per month depending on dose. Each KwikPen contains four weekly injections. Starting dose (2.5 mg) is typically cheaper than maximum dose (15 mg). Prices vary between private providers, so it's worth comparing. NHS access is free but involves waiting lists.
What should I expect from a private Mounjaro consultation?
A private online consultation typically involves a brief medical history review with a UK-licensed prescriber, questions about your weight, health conditions, and any medications you take. If approved, you'll receive a prescription sent to a GPhC-registered pharmacy for dispensing. Some providers offer follow-up reviews. Always ensure your prescriber is UK-licensed and registered.
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.