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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Can You Get Mounjaro From a UK Pharmacy?
Yes, you can get Mounjaro from a UK pharmacy, but only with a valid prescription from a UK-licensed prescriber. Mounjaro (tirzepatide) is a prescription-only medicine available through two main routes: the NHS specialist weight management services or private prescription through online pharmacies following a clinical assessment. This guide explains how to access Mounjaro in the UK, what it costs, and what the eligibility requirements are.
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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.
How to Access Mounjaro in the UK
There are two main pathways to obtain Mounjaro in the UK:
- NHS route: Referred by your GP to a tier 3 specialist weight management service. NICE has approved tirzepatide for NHS use, but access varies significantly by region and waiting lists can be lengthy (often several months). You'll need a BMI of 30 or above, or 27–29.9 with weight-related health conditions like type 2 diabetes or high blood pressure.
- Private route: Online consultation with a UK-licensed prescriber through a GPhC-registered pharmacy. No NHS referral needed. Available without waiting lists but at personal cost. Prescriber assesses your eligibility based on BMI and health history. If approved, your Mounjaro KwikPen is dispensed within days.
Both routes require a clinical assessment before prescription. Your prescriber will check your medical history, current medications, and suitability for the medication.
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 Mounjaro Cost and NHS vs Private Comparison
Private Mounjaro costs typically range from £129 to £320 per month depending on the dose. Starting doses (2.5–5 mg) are usually cheaper than higher maintenance doses (10–15 mg). This cost is not covered by the NHS on the private route. On the NHS, there is no direct cost to you if prescribed through specialist services, but availability is limited and regional variation is significant. Private prescribing offers faster access without waiting lists, whilst NHS access is free but may involve months of waiting. Use our GLP-1 weight loss calculator to estimate potential results at different doses, helping you decide if private investment is worthwhile for your goals.
- 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.
Do I need a GP referral to get Mounjaro privately?
No. Private prescription Mounjaro can be obtained through an online consultation with a UK-licensed prescriber without a GP referral. However, your prescriber will ask about your medical history and current GP care. Informing your GP that you're starting Mounjaro is advisable so they can monitor any interactions with other medications.
How long does it take to get Mounjaro on the NHS?
This varies significantly by region (ICB). Waiting times range from three months to over a year in some areas. You'll need a GP referral to a tier 3 specialist weight management service. Availability depends on your local NHS commissioning and current service capacity. Contact your GP to discuss NHS options in your area.
What happens during a private Mounjaro consultation?
A UK-licensed prescriber will review your health questionnaire, BMI, medical history, and current medications. They'll assess your eligibility (typically BMI 27+ with health conditions or 30+). If approved, you'll receive a prescription and your Mounjaro KwikPen is dispensed by a GPhC-registered pharmacy, usually within 1–3 working days.
Is tirzepatide the same as Mounjaro?
Yes, tirzepatide is the active ingredient in Mounjaro. Mounjaro is the brand name for tirzepatide 2.5–15 mg once-weekly injection. Always check your prescription says Mounjaro to ensure you receive the correct product and dose.
Can I switch from NHS to private Mounjaro, or vice versa?
Yes, you can switch between NHS and private routes, but this requires prescriber coordination. If switching from NHS to private, ensure your new private prescriber has your NHS treatment history. If switching from private to NHS, discuss this with your GP and request referral to specialist services. Avoid gaps in treatment when switching. ```
Ready to take control of your weight loss journey?
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