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
When Will Mounjaro Be Available On The NHS?
Mounjaro (tirzepatide) is now available in the UK through NHS specialist weight management services, though access remains limited and varies significantly by region. NICE approved tirzepatide for NHS use in 2024, but specialist tier 3 and tier 4 weight management services control availability, and waiting lists can extend to many months or years in some areas. Most people currently access Mounjaro through private prescription following an online clinical assessment with a UK-licensed prescriber. This guide explains both NHS and private access routes, eligibility criteria, and what to expect from the prescription process.
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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.
How To Access Mounjaro In The UK Right Now
NHS access: Mounjaro is approved by NICE for use within NHS specialist weight management services for eligible adults with a BMI of 30 or above (or 27+ with weight-related health conditions). However, availability through the NHS depends entirely on your local Integrated Care Board (ICB) and regional tier 3/4 services. Many areas have substantial waiting lists, and some regions have not yet commissioned the drug. You must be referred by your GP to a specialist weight management service, where a consultant will assess your eligibility and suitability for tirzepatide therapy.
- Average NHS wait time: 6 months to 2+ years depending on region
- Requires GP referral to specialist services
- Free at point of use if approved
- Limited regional availability — not universally accessible across all NHS areas
Private access: Most people seeking Mounjaro in the UK currently use private prescription routes. Following an online consultation with a UK-licensed prescriber (usually a registered pharmacist or GP), a prescription is issued if clinically appropriate. This is dispensed by a GPhC-registered online pharmacy. Private prescriptions start at approximately £150–£250 per month depending on dose, with prices varying between providers. The entire process—consultation to delivery—typically takes 5–10 working days.
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: What's Right For You?
The NHS route is free but involves waiting lists and regional limitations. Private prescription is faster and doesn't require NHS referral, but costs between £150–£320 per month depending on your Mounjaro dose (5mg to 15mg). Your GP cannot directly prescribe Mounjaro on the NHS unless they are part of a tier 3 specialist weight management service—most primary care practices cannot. Before choosing a private provider, use our free GLP-1 weight loss calculator to estimate potential outcomes and dosing. Verify any online prescriber is registered with the GMC or GPhC, and check they conduct a proper clinical assessment including medical history review and contraindication screening, not just a quick online form.
- 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 available on the NHS in 2026?
Yes, NICE approved tirzepatide (Mounjaro) for NHS use in 2024, but availability is limited and varies by region. Access depends on your local ICB and whether your area has commissioned specialist tier 3/4 weight management services. You must be referred by your GP and meet eligibility criteria (BMI 30+, or 27+ with comorbidities). Waiting lists can be very long in many areas.
How much does Mounjaro cost on private prescription in the UK?
Private Mounjaro prescriptions typically cost £150–£250 per month for the 5mg starter dose, rising to £200–£320 per month for higher maintenance doses (10mg–15mg). Prices vary between online providers and may include consultation fees. Always confirm the full cost before proceeding, and ensure the prescriber is GMC or GPhC registered.
How long does it take to get Mounjaro on the NHS?
NHS waiting times vary significantly by region but commonly range from 6 months to 2+ years. This depends on your local ICB's commissioning decisions, the tier 3 service capacity, and your position on the waiting list. Some regions have not yet made Mounjaro available through the NHS. Check with your GP about your specific area's availability.
What's the difference between NHS and private Mounjaro prescriptions?
NHS prescriptions are free but involve waiting lists and limited regional availability. You need a GP referral and specialist assessment. Private prescriptions are faster (5–10 working days), require no NHS referral, but cost £150–£320 per month. Both require a prescription from a UK-licensed clinician and proper clinical assessment.
Do I need to see my GP before getting Mounjaro privately?
No, you can access private Mounjaro directly through an online consultation with a UK-licensed prescriber without involving your GP. However, it's advisable to inform your GP you're taking Mounjaro, as it may interact with other medications you're on, particularly oral contraceptives or diabetes medications. Your prescriber will ask about your full medical history during the consultation.
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.