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 Patient Information — How to Access & Cost in the UK
If you're considering Mounjaro (tirzepatide) for weight management in the UK, understanding how to access it and what it costs is essential. Mounjaro is a prescription-only, once-weekly injectable medication licensed in the UK for weight management in adults with a BMI of 30 or above, or 27 or above with weight-related health conditions such as type 2 diabetes or high blood pressure. Access in the UK follows two main routes: NHS specialist services or private prescription through an online clinical assessment. This guide covers the key information you need to make an informed decision about Mounjaro access and costs.
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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.
Mounjaro Cost in the UK: Private Prescription Pricing
Mounjaro is available privately in the UK through GPhC-registered online pharmacies. Private Mounjaro costs typically range from £129 to £320 per month, depending on your dose and the pharmacy provider. This covers a single KwikPen (four weekly injections). The 2.5 mg starting dose is usually at the lower end of pricing, whilst higher doses (10–15 mg) cost more. When budgeting, remember that you'll need to increase your dose gradually — most patients spend 16–20 weeks titrating from 2.5 mg to a maintenance dose, meaning your monthly cost may vary. An online clinical assessment (typically £20–£50) is required before your first prescription. Once prescribed, repeat consultations for dose adjustments or ongoing prescriptions may have lower costs or be included. Always check with individual providers about their consultation fees and whether repeat assessments are charged separately. Private access means you don't have to wait for NHS referral and specialist appointment timescales, which can be several months in many areas.
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 Access: Which Route Is Right for You?
NHS access: NICE has approved tirzepatide for specialist weight management services. You'll need a referral from your GP to a tier 3 or tier 4 specialist weight management service. NHS access is free at point of use but involves waiting lists that vary significantly by region — some areas have waits of 6–18 months. Your prescriber will manage your dose titration and monitor for side effects. Private access: You book an online consultation with a UK-licensed prescriber, declare your health information, and receive a prescription if clinically appropriate. The consultation is faster (often within days) and you arrange dispensing with a GPhC pharmacy. You manage your own injections and side effect monitoring but have direct contact with your prescriber if needed. Private costs are higher but access is quicker. Both routes require genuine clinical assessment — neither provides Mounjaro without evaluation of your BMI, health conditions, and suitability.
- 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 on the NHS in the UK?
Mounjaro is free on the NHS if prescribed through a specialist weight management service. However, NHS access requires a GP referral and assessment at a specialist clinic. Availability and waiting times vary significantly by region. Some areas have dedicated tier 3 services; others have limited capacity. Check with your local ICB (Integrated Care Board) for your area's services and waiting list length.
Can I get Mounjaro without waiting months for NHS?
Yes, through private prescription. Private online consultations typically take days to a week, compared to NHS waits of several months in many regions. You'll pay privately (£129–£320 per month depending on dose), but access is faster. Both routes require proper clinical assessment — you cannot obtain Mounjaro without evaluation of your health and eligibility.
What's included in the monthly cost of private Mounjaro?
The monthly cost (£129–£320) covers one KwikPen with four weekly doses at your prescribed strength. It does not include the initial online consultation (typically £20–£50), though repeat consultations may be cheaper or included depending on the provider. Needles, sharps disposal, and support are usually included — check with your pharmacy.
Is there a lower-cost option if I can't afford private Mounjaro?
If private costs are prohibitive, ask your GP about NHS referral to specialist weight management services, which provide treatment free. Alternatively, some patients explore NHS eligibility for GLP-1 medications like Saxenda (liraglutide), which may be available through certain services. Discuss all options with your GP to find a pathway that works for you.
How does the Mounjaro KwikPen work and is it easy to inject?
The KwikPen is a pre-filled auto-injection pen holding four weekly doses. You select your dose via a dial, inject into stomach, thigh, or upper arm, and press the button. Most people find it straightforward after one or two supervised injections. Your prescriber or pharmacist will demonstrate the technique before your first injection and provide video guidance or written instructions.
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.