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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Mounjaro Weight Loss — How to Access and Cost in the UK
Mounjaro (tirzepatide) is a prescription-only weekly weight loss injection available in the UK through both NHS specialist services and private prescribing routes. Access and cost vary significantly depending on which pathway you choose. Understanding your options — NHS waiting lists versus private online prescriptions — helps you make an informed decision about whether this weekly weight loss injection is right for you. This guide explains how to access Mounjaro in the UK and what to expect at each stage.
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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 Prescribing and Cost in the UK
Private access to Mounjaro in the UK is through GPhC-registered online pharmacies following a clinical assessment with a UK-licensed prescriber. Typical private costs range from approximately £129 to £320 per month, depending on the dose. A standard KwikPen (4 weeks supply) at maintenance dose (10–15 mg) typically costs between £200 and £280. Private prescribing does not require NHS referral or involvement with specialist weight management services — you access treatment directly.
- Starting doses (2.5–5 mg): Usually £129–£170 per month
- Mid-range doses (7.5–10 mg): Usually £180–£240 per month
- Maximum dose (15 mg): Usually £240–£320 per month
Private prescribers assess your medical history, current medications, and suitability during an online consultation (typically £20–£50). If approved, a prescription is issued to a GPhC-registered pharmacy for dispensing. Costs exclude delivery fees (usually £5–£10). Some private providers offer subscription discounts for ongoing 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.
NHS Access and Private Routes Explained
NHS route: Mounjaro is available through tier 3 specialist weight management services, but access is limited and varies significantly by region. You typically need a GP referral to specialist services, which involves assessment and potential waiting lists of many months. NICE has approved tirzepatide for NHS use, but availability depends on your Integrated Care Board (ICB) funding and local service capacity.
Private online route: Faster access without NHS involvement. Requires an online consultation with a licensed prescriber, medical history review, and suitability assessment. No GP referral needed. Treatment can begin within days if approved. Our GLP-1 weight loss calculator can help you understand potential outcomes at different doses before consulting a prescriber.
What to expect during private assessment: You'll answer health questions about diabetes, heart conditions, thyroid problems, and medications. The prescriber reviews whether Mounjaro is suitable. If approved, you'll receive a prescription that can be sent to any UK pharmacy. Storage costs are your responsibility — unopened KwikPens must be refrigerated at 2–8°C. Use our free BMI calculator to check your starting point, and our progress tracker to monitor results throughout your treatment journey.
- 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.
How much does Mounjaro cost privately in the UK?
Private Mounjaro costs typically range from £129–£320 per month depending on dose. Starting doses (2.5–5 mg) cost around £129–£170, mid-range doses (7.5–10 mg) cost £180–£240, and maximum dose (15 mg) costs £240–£320. Prices vary between providers and may include online consultation fees (£20–£50) and delivery charges (£5–£10).
Can I get Mounjaro on the NHS in the UK?
Yes, Mounjaro is available through NHS tier 3 specialist weight management services, though access is limited and varies by region. You need a GP referral to specialist services, which may involve waiting lists of several months. NICE has approved tirzepatide for NHS use, but availability depends on your local Integrated Care Board funding and service capacity.
What's the difference between NHS and private Mounjaro access?
NHS access requires GP referral to specialist services and potential long waiting lists, but treatment is free once approved. Private access is faster (days rather than months), doesn't require NHS involvement, but costs £129–£320 monthly. NHS eligibility criteria are strict; private prescribers may have different assessment approaches.
Do I need a GP referral to get Mounjaro privately?
No. Private online prescribing doesn't require GP involvement or referral. You complete an online consultation directly with a licensed prescriber, who assesses your suitability. If approved, a prescription is issued to a GPhC-registered pharmacy. Your GP doesn't need to be involved, though some people inform their GP for continuity of care.
What happens after my Mounjaro prescription is approved privately?
Your prescription is sent to a GPhC-registered pharmacy for dispensing. The pharmacy supplies your KwikPen (pre-filled 4-week supply) with delivery typically within 2–5 working days. You receive storage instructions (refrigerate at 2–8°C). Follow-up prescriptions usually require a check-in with the prescriber every 4–12 weeks depending on the provider's protocol.
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.