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 Offers and Pricing in the UK
Mounjaro (tirzepatide) is a prescription-only weight management injection available in the UK through both NHS specialist services and private prescribing routes. Understanding your options—including eligibility, costs, and how to access the medication—is essential before starting treatment. This guide explains the current landscape for Mounjaro availability and what you need to know about getting started with this dual GIP and 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.
NHS Access and Eligibility for Mounjaro
NICE has approved tirzepatide (Mounjaro) for use within NHS specialist weight management services, but access is limited and varies significantly by region. You typically cannot obtain Mounjaro from your GP directly—you must be referred to a tier 3 or tier 4 specialist weight management service through your local Integrated Care Board (ICB).
- Eligibility: Adults with BMI ≥30, or BMI 27–29.9 with weight-related health conditions (type 2 diabetes, hypertension, cardiovascular disease, sleep apnoea)
- Ethnicity adjustment: For South Asian, Chinese, Black African, or Black Caribbean adults, lower thresholds may apply (BMI ≥27.5)
- Clinical assessment: You must undergo a full assessment by a specialist team before prescription
- Waiting lists: NHS specialist services have significant waiting times in many areas—sometimes several months to over a year
Regional variation is substantial. Some ICBs have limited capacity; others may not currently offer tirzepatide. Ask your GP about your local NHS weight management pathway.
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.
Private Mounjaro Prescribing and Costs
Private access to Mounjaro is available through GPhC-registered online pharmacies following an online clinical assessment. You do not need an NHS referral. A UK-licensed prescriber reviews your medical history and determines whether Mounjaro is suitable for you.
- Cost range: Approximately £129–£320 per month depending on dose and provider
- Starter doses (2.5–5 mg): Generally lower cost; maintenance doses (10–15 mg): higher cost
- No offer codes or discounts: Reputable UK pharmacies do not use vouchers or promotional codes—pricing is transparent and regulated
- Speed: Prescription and delivery typically within 2–5 working days
Use our free GLP-1 weight loss calculator above to estimate potential results at different doses, helping you make an informed decision about private treatment.
- 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.
Is Mounjaro available on the NHS in the UK?
Yes, NICE has approved Mounjaro for NHS specialist weight management services. However, access depends on your local ICB and waiting lists can be lengthy. You must be referred to a tier 3 or tier 4 specialist service by your GP—it is not available through standard GP prescriptions. Regional variation is significant.
How much does Mounjaro cost privately in the UK?
Private Mounjaro costs range from approximately £129–£320 per month, depending on the dose and provider. Starter doses (2.5–5 mg) are typically cheaper; higher maintenance doses (10–15 mg) cost more. Prices are regulated and transparent—reputable providers do not offer discount codes.
What is the difference between Mounjaro and Wegovy on the NHS?
Both are NICE-approved for NHS weight management services, but access and availability vary by region. Mounjaro (tirzepatide) is a dual GIP and GLP-1 agonist; Wegovy (semaglutide) is a GLP-1 agonist only. Clinical trials show Mounjaro may produce slightly higher average weight loss. Your prescriber will assess which is more suitable.
Do I need a GP referral to get Mounjaro privately?
No. Private online prescribing does not require an NHS referral. You complete an online consultation with a UK-licensed prescriber, who reviews your medical history. If approved, a prescription is issued and dispensed by a GPhC-registered pharmacy—all without NHS involvement.
What eligibility criteria apply for Mounjaro on the NHS?
You must have a BMI of ≥30, or BMI 27–29.9 with at least one weight-related health condition (type 2 diabetes, hypertension, cardiovascular disease, or sleep apnoea). South Asian, Chinese, Black African, or Black Caribbean adults may be eligible at lower BMI thresholds. A specialist team conducts a full clinical assessment before prescription.
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.