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 Get Mounjaro Online in the UK
Mounjaro (tirzepatide) is available online in the UK through GPhC-registered pharmacies following a clinical assessment from a UK-licensed prescriber. Unlike accessing it through the NHS, which involves waiting lists at specialist weight management services, online prescribing offers faster access for eligible adults. This guide explains how the online process works, what to expect, and how it compares to NHS routes. Use our free BMI calculator above to check your starting point before exploring your options.
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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 Online Mounjaro Prescribing Works in the UK
When accessing Mounjaro through an online pharmacy UK route, the process typically follows these steps: You complete an online health questionnaire providing details about your medical history, current medications, weight, height, and any weight-related conditions. A UK-licensed prescriber reviews your answers and decides whether Mounjaro is clinically appropriate for you. If approved, a prescription is issued and sent to a GPhC-registered pharmacy, which dispenses the medication and delivers it to your home. The entire process usually takes 2–5 working days from initial consultation to delivery.
Eligibility criteria for prescription weight loss UK access include a BMI of 30 kg/m² or above, or 27–29.9 kg/m² with at least one weight-related health condition such as type 2 diabetes, high blood pressure, or cardiovascular disease. For South Asian, Chinese, Black African, or Black Caribbean adults, lower BMI thresholds apply (27.5 and above). You must be 18 or over, not pregnant or breastfeeding, and have no known allergy to tirzepatide.
Cost through online providers typically ranges from £129 to £320 per month depending on your dose, whereas NHS specialist services cost nothing but involve variable waiting times across different regions.
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.
Mounjaro vs Wegovy and NHS Access Options
Mounjaro kwikpen contains tirzepatide, a dual GIP and GLP-1 receptor agonist — different from Wegovy (semaglutide), which is a GLP-1-only medication. Clinical trial data shows Mounjaro users lost an average of 15–21% body weight over 72 weeks, compared to approximately 15% with Wegovy, though individual results vary significantly.
Mounjaro dose titration starts at 2.5 mg weekly, increasing every 4 weeks to a maximum of 15 mg. This gradual approach minimises side effects. NHS NICE guidance approves Mounjaro NHS NICE access through specialist tier 3 weight management services for eligible patients, but waiting times can exceed 6–12 months in many areas. For faster access without NHS referral, online prescribing offers an alternative. Try our GLP-1 weight loss calculator to estimate potential results with 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 through online pharmacies in the UK?
Yes, Mounjaro is available through GPhC-registered online pharmacies following a consultation with a UK-licensed prescriber. You complete an online health questionnaire, a prescriber assesses your eligibility, and if approved, your prescription is dispensed and delivered to your home within 2–5 working days.
What's the difference between getting Mounjaro online versus NHS?
NHS access is free but involves referral to specialist services and potential waiting lists (months to years in some regions). Online prescribing is faster (days) but involves private costs (£129–£320 per month depending on dose). Both routes require a prescription from a qualified healthcare professional.
Am I eligible for Mounjaro online?
You may be eligible if you have a BMI of 30 kg/m² or above, or 27–29.9 kg/m² with a weight-related health condition. Lower thresholds apply for certain ethnic backgrounds. An online prescriber will assess your medical history, current medications, and individual circumstances during consultation.
How does Mounjaro compare to Wegovy?
Mounjaro (tirzepatide) is a dual GIP and GLP-1 agonist; Wegovy (semaglutide) is GLP-1-only. Mounjaro users averaged 15–clinically studied weight loss in trials versus 15% with Wegovy, though results vary individually. Both are once-weekly injections requiring prescription and clinical assessment.
What happens if I'm not approved for online Mounjaro?
If a prescriber determines Mounjaro isn't clinically appropriate, they may suggest alternatives such as lifestyle changes, NHS referral to tier 3 services, or discussion with your GP about other options. You can always seek a second opinion from another prescriber.
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.