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 Cost and Access — How to Get It in the UK
Mounjaro (tirzepatide) is available in the UK through two distinct routes: NHS specialist weight management services and private online prescribing following a clinical assessment. The cost, eligibility criteria, and timescales differ significantly between these pathways. This guide explains how to access Mounjaro in the UK, what you can expect to pay, and the key differences between NHS and private options. Our GLP-1 weight loss calculator can help you understand what results might be possible at different doses.
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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 Mounjaro Costs and Prescription Access in the UK
Private prescription costs vary by provider and dose. Typical pricing for Mounjaro through private online prescribing ranges from approximately £129 to £320 per month, depending on the dose you're prescribed. A 2.5 mg starting dose may cost around £129–£150 per month, while higher maintenance doses (10 mg to 15 mg) typically cost £240–£320 per month. Costs usually include the prescription fee, clinical assessment, and the medication itself. Each KwikPen contains 4 weeks of doses, so monthly costs align with your prescription cycle. Some providers offer bundle discounts if you commit to multiple months upfront. It's important to compare across GPhC-registered online pharmacies, as pricing and service quality vary. All private providers must operate under strict UK pharmaceutical regulations and employ licensed prescribers to conduct your clinical assessment. The tirzepatide (Mounjaro) dose titration protocol typically involves starting at 2.5 mg and increasing gradually every 4 weeks, so your costs will likely increase as your dose increases.
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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 vs Private: Which Route Is Right for You?
NHS access to Mounjaro is through specialist tier 3 weight management services, typically free at the point of use but involves referral from your GP and assessment by a specialist team. NICE has approved tirzepatide for NHS use, but availability varies significantly by region—some areas have waiting lists of several months or longer. Private routes offer faster access: you can complete an online consultation and receive a prescription within days if clinically appropriate, but you'll pay out of pocket. NHS is better if you're eligible and can wait; private suits those wanting quicker access and who can afford the cost. Your GP can advise on NHS eligibility and whether your local integrated care board (ICB) currently funds Mounjaro. A clinical assessment is mandatory for both routes—no medication is prescribed without this, regardless of access pathway.
- 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 per month on the NHS?
Mounjaro is free through NHS specialist weight management services once prescribed, as it's funded by your local ICB. However, access requires a GP referral and specialist assessment. Availability and waiting times vary significantly by region—contact your GP to check if your area offers it and current timescales.
What's the typical cost of Mounjaro through private online prescribing?
Private Mounjaro costs typically range from £129–£320 per month depending on your dose. Starting doses (2.5 mg) are usually cheaper; higher maintenance doses (10–15 mg) cost more. Costs include the prescription assessment, clinical review, and medication. Always compare prices across UK-registered providers.
How long does the private prescription process take?
Most private online consultations take 24–48 hours for assessment and prescription approval. If approved, your medication can be dispatched within 2–5 working days. Total time from consultation to receiving your Mounjaro is typically 3–7 days. NHS routes take considerably longer due to waiting lists.
What happens if I start Mounjaro privately but want to switch to NHS?
Switching from private to NHS is possible but timing varies. You can continue private treatment while on an NHS waiting list. Once NHS treatment is approved, you would typically stop private treatment. Discuss transition plans with both your private prescriber and NHS specialist team to ensure no gap in treatment.
Do I need a prescription from a GP to get Mounjaro privately?
No—private online prescribing does not require a GP referral or existing prescription. You complete an online clinical assessment with a UK-licensed prescriber, who decides if Mounjaro is appropriate for you. If approved, they issue a private prescription that's dispensed by a GPhC-registered pharmacy. Your GP doesn't need to be involved.
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.