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
How to Access Mounjaro in the UK Online
If you're looking for Mounjaro (tirzepatide) in the UK, you have two main routes: NHS specialist services or private prescription through a licensed online prescriber. Both require a clinical assessment, but they differ significantly in cost, waiting time, and eligibility requirements. This guide explains how each route works, what you can expect to pay, and how to determine which option is right for you based on your circumstances and health needs.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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.
Private Prescription Costs and Access in the UK
Private online prescribers in the UK can issue Mounjaro prescriptions following an online consultation with a licensed healthcare professional. Costs typically range from £129 to £320 per month depending on the dose, as tirzepatide requires dose escalation over several weeks. A single KwikPen device contains 4 weeks' worth of doses (one injection per week), so monthly costs reflect the dose you're currently on.
Dose-based pricing example:
- Starting doses (2.5 mg–5 mg): approximately £129–£180/month
- Mid-range doses (7.5 mg–10 mg): approximately £200–£250/month
- Higher doses (12.5 mg–15 mg): approximately £280–£320/month
Private prescribing avoids NHS waiting lists but involves upfront costs. The online consultation typically costs £20–£50 and must be repeated when you need a prescription renewal or dose adjustment. Always verify that any provider you use is registered with the GPhC (General Pharmaceutical Council) and employs UK-licensed prescribers.
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 Access vs Private Routes
The NHS route requires referral to a tier 3 specialist weight management service through your GP. If approved, Mounjaro may be provided free on the NHS, but access is limited and varies significantly by region (Integrated Care Board). Waiting lists can be several months or longer in many areas, and not all regions currently commission tirzepatide.
The online consultation process for private prescriptions is straightforward: you complete a health questionnaire, a UK-licensed prescriber reviews your details and medical history, and if approved, they issue a prescription which is dispensed by a registered pharmacy. This process typically takes 24–48 hours. You'll need to attend follow-up consultations for dose increases and ongoing monitoring. Calculate your projected weight loss and eligibility using our GLP-1 weight loss calculator before your consultation to have realistic expectations.
- 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?
Yes, but access is limited. NICE has approved tirzepatide for use within NHS specialist tier 3 weight management services. Availability depends on your local ICB's commissioning. You must be referred by your GP to a specialist service. Waiting lists vary from weeks to many months depending on your region.
What is the typical cost of Mounjaro on private prescription in the UK?
Private Mounjaro costs range from approximately £129–£320 per month depending on your current dose. Starting doses cost less; higher maintenance doses cost more. Consultation fees (£20–£50) are usually separate. Costs are upfront and not covered by the NHS if using private prescribing.
How do I know if an online prescriber is legitimate?
Check that the provider is registered with the GPhC (General Pharmaceutical Council). The prescriber must be a UK-licensed doctor, nurse practitioner, or pharmacist independent prescriber. Avoid services that don't require a consultation or that offer prescriptions without clinical assessment. Legitimate providers will ask detailed health questions.
What's the difference between NHS and private access to Mounjaro?
NHS access is free but involves referral, assessment, and potential waiting lists. Private access is faster (24–48 hours) and doesn't require NHS referral, but you pay for consultations and medication upfront. Both routes require clinical assessment and prescription from a licensed healthcare professional.
Will Mounjaro work faster at higher doses?
Higher doses aren't necessarily faster — they're part of a structured escalation plan (typically increasing every 4 weeks). Your prescriber will gradually increase your dose to find the level that works for you while minimising side effects. Individual results vary regardless of dose, so patience with the titration schedule is important.
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.