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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Tips for Taking Mounjaro: Cost and Access in the UK
Taking Mounjaro (tirzepatide) successfully starts with understanding how to access it and manage the costs involved. In the UK, Mounjaro is available through both NHS specialist weight management services and private prescription routes, each with different timescales and expenses. This guide covers the practical steps to getting Mounjaro, what to expect financially, and how to use it safely alongside lifestyle changes. Whether you're exploring NHS options or considering private prescription, knowing the facts about eligibility, costs, and the clinical assessment process will help you make an informed decision about your weight management journey.
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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.
UK Private Prescription Costs and Access Routes
Private prescription costs for Mounjaro in the UK typically range from £129 to £320 per month, depending on the dose you're prescribed and the provider you use. The Mounjaro KwikPen device contains four pre-filled pens (a four-week supply), and costs vary because different doses require different pack sizes and pricing structures. Starting doses (2.5 mg) are generally cheaper than maintenance or higher doses (10–15 mg). Private prescriptions can be obtained through GPhC-registered online clinics following a clinical assessment, usually completed within 24–48 hours. This route offers faster access than NHS services—typically available within days—and doesn't require a GP referral. However, cost is entirely your responsibility, and there are no prescription exemptions available for private Mounjaro prescriptions. Our GLP-1 weight loss calculator can help you estimate potential costs and outcomes at different doses, allowing you to compare options before committing.
- Starting dose (2.5 mg): typically £129–£180/month
- Mid-range dose (5–7.5 mg): typically £180–£250/month
- Higher dose (10–15 mg): typically £250–£320/month
- Each KwikPen lasts four weeks and is single-use
- No NHS prescription exemptions apply
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 Routes: How to Access Mounjaro in the UK
NHS access to Mounjaro is through specialist tier 3 or tier 4 weight management services, available only by GP referral. NICE has approved tirzepatide for use within these services, but availability varies significantly by region and local integrated care boards (ICBs). Waiting times can be months or years in many areas, and not all regions fund Mounjaro yet. Private access is faster and doesn't require NHS referral—you complete an online consultation with a UK-licensed prescriber, who assesses your eligibility based on your health history, BMI, and weight-related conditions. If approved, your prescription is sent to a GPhC-registered pharmacy and Mounjaro is delivered to your home. The online process is straightforward: you'll answer health questions, and the prescriber will confirm whether Mounjaro is suitable for you before issuing a prescription. Both routes require a clinical assessment; the main differences are timescale, cost, and regional availability.
- 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 private prescription in the UK?
Private Mounjaro costs typically range from £129–£320 per month depending on your dose. A starter dose (2.5 mg) is usually £129–£180/month, while higher doses (10–15 mg) cost £250–£320/month. Each KwikPen contains four weeks of injections. Costs vary between providers, so it's worth comparing options before ordering.
Can I get Mounjaro on the NHS in the UK?
Yes, Mounjaro (tirzepatide) is approved by NICE for NHS use within specialist weight management services (tier 3/4). However, access requires a GP referral and availability varies by region. Waiting lists can be very long—sometimes months or years. Check with your local ICB about whether your area funds Mounjaro and typical wait times.
What's the difference between Mounjaro and Wegovy for cost and access?
Both are prescription-only UK-licensed weight loss injections. Mounjaro (tirzepatide) is a dual GIP/GLP-1 agonist; Wegovy (semaglutide) is a GLP-1 agonist only. Private costs are similar (£129–£320/month depending on dose). Both are available through NHS specialist services or private prescription, though specific availability and costs may vary between providers.
How do I get a private Mounjaro prescription in the UK?
Complete an online consultation with a UK-licensed prescriber through a GPhC-registered clinic. Answer health questions about your weight, BMI, medical history, and weight-related conditions. If you're eligible (BMI 30+ or 27+ with comorbidities), the prescriber issues a prescription sent to a pharmacy, and Mounjaro is delivered to your home—usually within 1–3 days.
Is Mounjaro eligible for prescription exemptions or funding support?
On private prescription, no. Private Mounjaro is not eligible for NHS exemptions or prescription charges reduction. On NHS prescription through specialist services, standard exemptions apply (e.g. for under-18s, over-60s, those on certain benefits). Ask your NHS weight management service about any local patient support programmes.
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.