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 Subscription in the UK: Cost and Access
Mounjaro (tirzepatide) is available in the UK through both NHS specialist services and private prescription routes, but access, cost, and waiting times vary significantly depending on which pathway you choose. If you're considering Mounjaro as a weight loss injection in the UK, understanding the subscription model, costs, and how to access it is essential. This guide explains both routes, what you'll pay, and what to expect from the prescription process.
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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.
Private Mounjaro Subscription Costs in the UK
Private prescription Mounjaro is available through UK-registered online prescribing services, with costs typically ranging from £129 to £280 per month depending on your dose and provider. Each KwikPen contains four weekly injections (one month's supply). Mounjaro uses a dose titration schedule, starting at 2.5 mg and increasing gradually, so your monthly cost may change as your dose increases from 5 mg up to 15 mg (the maximum).
- 2.5–5 mg dose: approximately £129–£160 per month
- 7.5–10 mg dose: approximately £180–£220 per month
- 12.5–15 mg dose: approximately £240–£280 per month
Most private prescribing services operate on a subscription model — you pay monthly for your prescription and medication dispensed together. There are no hidden fees for the prescription itself; the cost covers both the clinical assessment and the medication supply. Some services offer discounts for upfront payment or three-month supplies, though prices vary.
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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
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NHS vs Private Access and What to Expect
NHS access to Mounjaro is through specialist tier 3 and tier 4 weight management services, typically accessed by GP referral. However, NICE approval does not assures immediate availability — supply varies by region and waiting lists can be months or even years in some areas. You will not pay prescription charges for NHS Mounjaro if you're eligible, but accessing it requires meeting local eligibility criteria and going through a specialist assessment.
Private online consultations typically take 15–30 minutes, conducted by a UK-licensed prescriber who will assess your medical history, current medications, and weight loss goals. If approved, a prescription is issued to a GPhC-registered pharmacy, and your first KwikPen arrives within 3–5 working days. You'll need to renew your prescription monthly, which usually involves a brief check-in consultation.
- 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 in the UK?
Yes, NICE has approved tirzepatide (Mounjaro) for NHS specialist weight management services. However, NHS access is limited to tier 3/4 specialist centres, requires GP referral, and waiting times vary significantly by region — some areas have waiting lists of several months or longer. Not all ICBs currently offer it due to supply constraints.
How much does a Mounjaro subscription cost privately in the UK?
Private Mounjaro subscriptions typically cost £129–£280 per month depending on your dose. The starting dose (2.5–5 mg) is cheapest at around £129–£160, while the maximum dose (15 mg) costs approximately £240–£280. Each subscription includes the prescription, clinical assessment, and one KwikPen (four weekly injections).
What's included in a private Mounjaro subscription?
Private subscriptions cover the clinical consultation (initial and ongoing), the prescription itself, and one KwikPen per month. You do not pay separately for the consultation or prescription — the monthly cost covers everything. Some services may offer additional support like progress tracking or lifestyle guidance.
Do I need a prescription to buy Mounjaro privately in the UK?
Yes, Mounjaro is prescription-only in the UK. You cannot purchase it without a valid prescription from a UK-licensed prescriber, and it can only be dispensed by a GPhC-registered pharmacy. An online consultation with a prescriber is required to determine suitability before a prescription is issued.
How long does it take to receive Mounjaro after my online consultation?
Once your prescription is approved during your online consultation, dispensing typically takes 2–5 working days. Your first KwikPen usually arrives within 3–5 working days from the initial consultation. Subsequent monthly prescriptions are usually processed faster once your ongoing subscription is established.
Ready to take control of your weight loss journey?
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