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 Injection — Cost and Access in the UK
Mounjaro (tirzepatide) is a prescription-only weekly weight loss injection available in the UK through both NHS specialist services and private online prescribing. The cost, eligibility, and access route depend on whether you choose NHS or private treatment. This guide explains how to access Mounjaro, what it costs, and what to expect from each pathway.
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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 Cost and Access in the UK
Private Mounjaro prescriptions are available through GPhC-registered online pharmacies following a clinical assessment with a UK-licensed prescriber. The cost varies depending on the dose strength and duration of supply, typically ranging from £129 to £320 per month. Starting doses (2.5 mg) are usually at the lower end, while higher maintenance doses (10–15 mg) cost more.
- Prescriptions are issued online following a consultation
- No NHS referral required
- Medication is dispensed by regulated UK pharmacies
- Costs include the prescription and medication only — not consultation fees in most cases
- Private access can be faster than NHS, with treatment starting within days in many cases
Pricing may vary between providers, so it's worth comparing options. Many private prescribers offer flexible payment plans or bulk purchasing discounts.
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 vs Private: Which Route Is Right for You?
The NHS route to Mounjaro involves referral to a tier 3 specialist weight management service through your GP. NHS access is free at the point of prescription, but waiting times can be significant — some regions report waits of 6–18 months depending on local commissioning decisions and service capacity. NICE has approved tirzepatide (Mounjaro) for use within NHS specialist weight management services for eligible adults.
The private route offers faster access without waiting lists, but you pay the full medication cost. An online consultation typically takes 15–20 minutes. A prescriber reviews your medical history, BMI, and weight-related health conditions to assess suitability. If approved, your prescription is sent to a pharmacy and dispensed within 1–2 working days. You'll use our GLP-1 weight loss calculator to project potential outcomes at different doses.
Eligibility is the same for both routes: adults with a BMI of 30 kg/m² or above, or 25–29.9 kg/m² with weight-related health conditions such as type 2 diabetes, high blood pressure, or sleep apnoea. For South Asian, Chinese, Black African, or Black Caribbean adults, lower BMI thresholds may apply. Use our free BMI calculator to check your personal BMI instantly.
Choose the NHS route if you have time to wait and prefer no direct cost. Choose the private route if you need faster access and can afford the ongoing medication costs. Many people also use our progress tracker to monitor results over time, which helps inform discussions with healthcare providers about medication effectiveness.
- 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 to £320 per month depending on dose strength. Starting doses (2.5 mg) are usually cheaper; maintenance doses (10–15 mg) cost more. Costs may vary between prescribers and pharmacies, and some offer discounts for bulk supplies or payment plans.
Can I get Mounjaro free on the NHS?
Yes, Mounjaro is available free on the NHS through specialist tier 3 weight management services. However, you need a GP referral and may face waiting times of 6–18 months depending on your region. NICE has approved tirzepatide for NHS use in eligible adults.
How long does it take to get Mounjaro privately?
With a private prescription, you can typically start treatment within 1–2 weeks. An online consultation takes 15–20 minutes, and if approved, your prescription is dispensed within 1–2 working days. This is significantly faster than NHS routes in most regions.
What's included in the private Mounjaro cost?
Private costs cover the medication and prescription only. Most online prescribers include the consultation fee within the medication price, though this varies. Storage, delivery, and injection supplies (needles, alcohol wipes) are usually additional costs.
How do I know if I'm eligible for Mounjaro?
Eligibility requires a BMI of 30 or above, or 27–29.9 with weight-related health conditions such as type 2 diabetes, hypertension, or sleep apnoea. Lower BMI thresholds apply for certain ethnic groups. An online prescriber will assess your eligibility during your consultation.
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.