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 Through a UK Pharmacist
If you're considering Mounjaro (tirzepatide) for weight management, a UK pharmacist can help you access it either through private prescription services or NHS pathways. Unlike standard medications dispensed by your local pharmacy, Mounjaro requires a clinical assessment before dispensing—whether you're accessing it privately through an online prescriber or via NHS specialist weight management services. Understanding the routes, costs, and eligibility criteria helps you make an informed decision about whether this GIP and GLP-1 receptor agonist injection is right for you.
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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.
Private Prescription Cost & Access Routes
Private access to Mounjaro in the UK is available through GPhC-registered online pharmacies following a remote clinical consultation with a licensed prescriber. Costs vary significantly by dose and provider, typically ranging from £129 to £320 per month. A 4-week supply (one KwikPen with 4 pre-filled doses) is the standard dispensing unit. Pricing depends on which dose you're prescribed—starting doses (2.5 mg) are generally cheaper than maintenance or maximum doses (15 mg). Private prescribing offers faster access than NHS routes, often within days of approval. No GP referral is needed, making it accessible to anyone who meets the eligibility criteria. Pharmacists will verify your prescription, confirm suitability, and provide counselling on injection technique, storage, and side effects before dispatch. Use our free GLP-1 weight loss calculator to estimate potential outcomes at different doses before committing to costs.
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 Routes & Eligibility
NHS access to Mounjaro is through specialist tier 3/4 weight management services—not standard GP prescription. You'll need a GP referral to a local ICB-commissioned specialist service, though availability varies significantly by region. NHS waiting lists can extend months or years in many areas. Once approved, Mounjaro is free on the NHS if provided through specialist services. Private routes require meeting NICE eligibility criteria: BMI 30+ or BMI 27+ with weight-related health conditions (type 2 diabetes, hypertension, dyslipidaemia, sleep apnoea, cardiovascular disease). For South Asian, Chinese, Black African, or Black Caribbean adults, lower BMI thresholds may apply (27.5+). An online prescriber assesses your health during consultation; if suitable, a prescription is issued to a GPhC pharmacy. Calculate your personal BMI using our free tool above to check initial eligibility before starting the consultation process.
- 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.
Can I get Mounjaro from any UK pharmacist?
Mounjaro is prescription-only and must be dispensed by a GPhC-registered pharmacy. You cannot buy it over the counter. Private access requires a prescription from a UK-licensed prescriber following clinical assessment. NHS access is through specialist weight management services only, not high street pharmacies. Always ensure your pharmacy is registered with the GPhC.
How much does Mounjaro cost privately in the UK?
Private Mounjaro costs typically range from £129–£320 per month depending on dose. A 4-week supply (one KwikPen) is standard. Starting doses (2.5 mg) are generally cheaper; higher maintenance doses (10–15 mg) cost more. Prices vary between providers. Always compare costs across registered pharmacies before purchasing.
What's the difference between NHS and private Mounjaro?
The medication is identical; the difference is access and cost. NHS requires GP referral to specialist services and may involve waiting lists—but is free once approved. Private routes offer faster access (days), no referral needed, but you pay monthly. Eligibility criteria are the same for both; a prescriber assesses suitability either way.
Do I need a GP referral to get Mounjaro privately?
No. Private Mounjaro access doesn't require a GP referral. You contact a GPhC-registered online pharmacy directly, complete a clinical consultation with a licensed prescriber, and receive a prescription if suitable. Your GP doesn't need to be involved, though informing your GP is recommended for medical safety.
What happens after my Mounjaro prescription is approved?
Once approved, your prescription is sent to a GPhC pharmacy for dispensing. The pharmacy contacts you with cost confirmation and delivery details. You'll receive guidance on injection technique, storage (refrigerate at 2–8°C), and side effect management. Support is available from the pharmacy if you have questions after starting 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.