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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Is Mounjaro In Stock in the UK? NHS and Private Access
Mounjaro (tirzepatide) availability in the UK varies depending on whether you're accessing it through NHS services or private prescription routes. NHS access is through specialist tier 3 weight management services following referral from your GP, whilst private prescription is available through registered online healthcare providers following a clinical assessment. This guide explains current UK availability, NHS eligibility criteria, and how to access Mounjaro regardless of supply status.
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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 Mounjaro Access and Current Availability
NICE approval and NHS prescribing: Mounjaro (tirzepatide) is approved by NICE and is available for prescription within NHS specialist weight management services across England. However, availability varies significantly by region — some integrated care boards (ICBs) have active prescribing programmes, whilst others have waiting lists or limited access.
Eligibility for NHS Mounjaro: You may be eligible if you have a BMI of 30 kg/m² or above, or BMI of 27–29.9 kg/m² with weight-related health conditions (type 2 diabetes, prediabetes, high blood pressure, sleep apnoea, or cardiovascular disease). For South Asian, Chinese, Black African, or Black Caribbean adults, lower BMI thresholds apply.
How to access: Ask your GP for referral to tier 3 specialist weight management services. You'll be assessed by a multidisciplinary team before Mounjaro is prescribed. NHS waiting times can be lengthy — typically several months depending on 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 Prescription and Alternative Access Routes
Private online prescription services: Mounjaro is available through GPhC-registered online healthcare providers without NHS referral. Following a brief online clinical assessment with a UK-licensed prescriber, a prescription can be issued if appropriate. This route typically offers faster access — some providers can dispense within days.
Cost comparison: NHS access is free at the point of use but involves waiting. Private prescription costs vary (typically £120–£280 per month depending on dose) but offers immediate access. Our free GLP-1 weight loss calculator can help you estimate potential outcomes at different doses, supporting your decision about which route suits you.
Important: Both routes require a valid prescription from a UK-licensed prescriber following clinical assessment. Mounjaro is prescription-only medicine and cannot be purchased without medical evaluation.
- 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 currently in stock on the NHS?
Mounjaro is NICE-approved for NHS use, but availability varies by region. Some areas have active prescribing with shorter waiting lists, whilst others have significant delays or limited access. Contact your local integrated care board or ask your GP about current availability in your area.
How long does it take to get Mounjaro through the NHS?
NHS waiting times vary considerably by region, typically ranging from 3–12 months or longer. You'll need a GP referral to tier 3 specialist services, where a multidisciplinary team will assess your eligibility before prescription. Private routes often offer faster access.
Can I get Mounjaro privately if the NHS waiting list is too long?
Yes. Mounjaro is available through GPhC-registered online healthcare providers without NHS referral. Following an online clinical assessment with a UK-licensed prescriber, you may be prescribed Mounjaro if clinically appropriate. This typically takes days rather than months.
What's the difference between accessing Mounjaro through NHS vs private prescription?
NHS access is free but involves waiting and regional variation in availability. Private prescription involves a cost (typically £120–£280 monthly) but offers faster access without referral. Both require prescription from a licensed prescriber following clinical assessment.
Do I need a GP referral to get Mounjaro privately?
No. Private prescription services do not require a GP referral. You can access an online clinical assessment directly with a UK-licensed prescriber. Your GP doesn't need to be involved, though it's helpful to inform them if you start weight management treatment.
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.