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 Weight Loss Pill — UK Cost and Access
Mounjaro (tirzepatide) is a prescription-only weekly weight loss injection available in the UK through both NHS specialist services and private online prescribing. This guide explains how to access it, what it costs, and the difference between NHS and private routes. Whether you're exploring this weekly weight loss injection through your GP or considering private prescription options, understanding the costs and access pathways will help you make an informed decision about this GLP-1 receptor agonist medication.
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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 in the UK
Private prescription costs for Mounjaro vary by dose and provider, typically ranging from £129 to £320 per month depending on whether you're starting at 2.5 mg or escalating to higher maintenance doses. The cost structure usually reflects the dose you're prescribed — starting doses (2.5–5 mg) are generally cheaper than maximum doses (15 mg).
- Most private providers charge per KwikPen (4-week supply), not per dose
- Some offer subscription discounts for ongoing patients
- Online consultation fees (£15–£50) may be separate or included
- Prescription is issued only after clinical assessment by a UK-licensed prescriber
Private access allows you to start treatment without NHS waiting lists, though costs accumulate over time. Use our GLP-1 weight loss calculator to estimate potential outcomes, which can help you assess whether the investment aligns with your weight loss goals.
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 Routes
NHS route: Free through specialist tier 3 weight management services, but requires GP referral and specialist assessment. Significant waiting lists (months to years depending on region) and variable availability across ICBs.
Private route: No NHS referral needed. Access a UK-licensed prescriber through an online consultation, receive a prescription if clinically appropriate, and obtain medication from a GPhC-registered pharmacy. Faster access but ongoing costs. Both routes require a clinical assessment to confirm eligibility based on your BMI and health profile — use our free BMI calculator to check where you stand before consulting.
The online consultation process is straightforward: complete a health questionnaire covering your medical history, current medications, and weight management goals. A prescriber reviews your information and may request additional details (BP, kidney function) before deciding whether Mounjaro is suitable. If approved, a prescription is issued and your medication is posted to you — usually within 3–7 working days. Your GP can support either route, though NHS access requires their formal referral to specialist services.
- 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–£320 per month depending on dose. Starting doses (2.5–5 mg) are generally cheaper, while maximum doses (15 mg) cost more. Costs are per KwikPen (4-week supply). Some providers offer subscription discounts for ongoing patients. Always check the exact price for your prescribed dose before committing.
Can I get Mounjaro free on the NHS in the UK?
Yes, Mounjaro is available free through NHS tier 3 specialist weight management services. However, you need a GP referral and specialist assessment, and waiting lists vary significantly by region — some areas have waits of several months to over a year. Private prescription offers faster access but involves ongoing costs.
What happens in an online Mounjaro consultation?
You'll complete a health questionnaire covering medical history, medications, and weight goals. A UK-licensed prescriber reviews your information and may request additional details like blood pressure or kidney function tests. If approved, a prescription is issued and your medication is posted to you within 3–7 working days. The entire process usually takes 1–2 weeks from initial consultation to delivery.
Do I need to see my GP to get Mounjaro privately?
No — you can access private prescription Mounjaro directly through an online consultation with a UK-licensed prescriber without involving your GP. However, it's good practice to inform your GP that you're starting Mounjaro, especially if you take other medications or have existing health conditions. Your GP can then monitor your progress and adjust other treatments if needed.
Is Mounjaro cheaper than Wegovy in the UK?
Costs are broadly similar — both weekly weight loss injections typically cost £129–£320 monthly depending on dose. Mounjaro and Wegovy are dual GIP/GLP-1 and GLP-1 agonists respectively. Pricing varies between providers, so comparing quotes from different online prescribers is worthwhile. Clinical trial data shows different average weight loss outcomes for each — use our GLP-1 weight loss calculator to see projected results for your circumstances.
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.