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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Where to Get Mounjaro in the UK: NHS and Private Options
There is no single "best company" for Mounjaro in the UK — instead, you have two main routes: NHS specialist weight management services or private online prescribing through GPhC-registered pharmacies. Your choice depends on eligibility, waiting times, and budget. This guide explains both pathways, what to expect from each, and how to access tirzepatide (Mounjaro's active ingredient) in the UK.
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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.
Accessing Mounjaro Through the NHS
NHS access to Mounjaro is through specialist tier 3 or tier 4 weight management services, not your GP surgery. NICE (National Institute for Health and Care Excellence) has approved tirzepatide for use within NHS specialist weight management services for eligible adults. To start this pathway, ask your GP for a referral to your local integrated care board's (ICB) specialist weight management service.
- NHS eligibility: BMI of 30 or above, or BMI 27–29.9 with weight-related health conditions (type 2 diabetes, hypertension, cardiovascular disease, sleep apnoea)
- Lower thresholds for South Asian, Chinese, Black African, and Black Caribbean adults (BMI 27.5+)
- Assessment and dose titration managed by specialist clinicians
- Significant regional variation in availability and waiting times — some areas have waiting lists of 12–24+ months
- No prescription costs if referred through NHS pathway
Your local NHS weight management service will assess your suitability, manage your Mounjaro KwikPen doses, and monitor side effects throughout treatment.
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.
Accessing Mounjaro Through Private Prescription
Private access to Mounjaro is faster and does not require NHS referral. GPhC-registered online pharmacies work with UK-licensed prescribers to assess your eligibility and issue prescriptions. This route is available to anyone who meets clinical criteria and can afford the cost.
- Fast access: typically prescription issued within 24–48 hours of online assessment
- No NHS waiting lists — available immediately on prescription
- Cost ranges from approximately £129–£320 per month depending on dose
- Prescriber conducts online clinical assessment before issuing prescription
- Same Mounjaro KwikPen medication as NHS route — no difference in the actual medicine
- Responsibility for monitoring side effects rests with you and your prescriber
Private providers typically offer ongoing support and dose adjustment guidance. Use our free GLP-1 weight loss calculator to explore projected weight loss outcomes at different doses.
- 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 the UK?
Yes, Mounjaro (tirzepatide) is approved by NICE for use within NHS specialist tier 3 weight management services. Access is through specialist referral, not standard GP prescription. Availability and waiting times vary significantly by region. Your GP can refer you if you meet eligibility criteria.
How long does it take to get Mounjaro on the NHS?
NHS waiting times vary widely by integrated care board. Some areas have waiting lists of 3–6 months, while others wait 12–24 months or longer. Private prescription can be issued within 24–48 hours but involves a cost. Check with your local NHS weight management service for realistic timescales in your area.
What is the difference between NHS and private Mounjaro?
The medication itself is identical — both routes provide the same Mounjaro KwikPen. The main differences are: NHS has no cost but long waiting lists; private is fast but costs £129–£320/month. NHS includes specialist clinical support; private relies on your prescriber's assessments. Choose based on urgency and budget.
Do I need a referral from my GP to get private Mounjaro?
No. Private online prescribing does not require a GP referral. You complete an online clinical assessment with a UK-licensed prescriber, who assesses your eligibility independently. If approved, a prescription is issued and dispensed by a GPhC-registered pharmacy. Your GP does not need to be involved.
What is the cost of Mounjaro through private prescription in the UK?
Private Mounjaro costs approximately £129–£320 per month, depending on your dose. Starting doses (2.5–5mg) are typically cheaper than higher maintenance doses (10–15mg). Prices vary between providers. Calculate your potential weight loss outcomes using our free GLP-1 calculator to help evaluate whether private access is right for you.
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.