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 Slimming Injections — UK Cost and Access
Mounjaro (tirzepatide) is a prescription-only weekly injection that may help with weight management, available through both NHS specialist services and private online prescribers in the UK. If you're considering this medication, understanding the cost, access routes, and eligibility criteria is essential. This guide explains how to access Mounjaro in the UK, what it costs privately, and how NHS access works. Use our free GLP-1 weight loss calculator to see projected results at different doses, and our BMI calculator to check your eligibility starting point.
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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 Costs and Online Access in the UK
Private prescription costs: Mounjaro is available through private online prescribing services in the UK, with prices typically ranging from £140 to £320 per month depending on the dose and provider. Starting doses (2.5 mg) tend to be at the lower end, while maximum doses (15 mg) are more expensive.
- Standard 4-week supply (one KwikPen) at lower doses: approximately £140–£180
- Mid-range doses (7.5–10 mg): approximately £200–£260
- Higher doses (12.5–15 mg): approximately £270–£320
Costs vary between GPhC-registered providers and may change. The private route requires an online consultation with a UK-licensed prescriber who will assess your eligibility. If approved, your prescription is dispensed by a pharmacy and typically arrives within 2–5 working days. This route offers faster access than NHS services and does not require a GP referral.
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 Route — What's the Difference?
NHS access is free at the point of use but involves referral to a specialist tier 3 weight management service, significant waiting lists in many areas (sometimes 6–18 months), and strict eligibility criteria. NHS provision of Mounjaro varies by region and ICB (Integrated Care Board).
Private access is faster and does not require NHS referral, but involves upfront costs. You complete an online health questionnaire, consult with a UK-licensed prescriber remotely, and if suitable, receive a prescription. Private services offer flexibility and quicker access but require you to fund the medication yourself. Both routes provide legitimate prescription medication following proper clinical assessment.
- 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 typically costs £140–£320 per month depending on dose. Starting doses (2.5 mg) are around £140–£180, while maximum doses (15 mg) are £270–£320. Costs vary by provider and may include consultation fees. Always check individual provider pricing before committing.
Do I need a GP referral to get Mounjaro privately?
No. Private online prescribing services do not require a GP referral. You complete an online health assessment, consult with a UK-licensed prescriber, and if approved, receive a prescription. Your GP does not need to be involved, though it is good practice to inform them you are starting treatment.
How long does it take to get Mounjaro on the NHS?
NHS access involves waiting for a referral to a specialist weight management service, with waiting lists typically ranging from 6–18 months depending on your region. Availability and waiting times vary significantly across different ICBs. Ask your GP about the current waiting list in your area.
What happens during a private online Mounjaro consultation?
You complete a detailed health questionnaire covering medical history, current medications, and lifestyle. A UK-licensed prescriber reviews this remotely, asks follow-up questions if needed, and assesses your eligibility. If suitable, they issue a prescription dispensed by a pharmacy. The whole process usually takes 24–48 hours.
Is Mounjaro more expensive than Wegovy?
Costs are broadly similar — both typically range £140–£320 monthly depending on dose. Mounjaro vs Wegovy pricing varies by provider and dose. Mounjaro reaches a higher maximum dose (15 mg vs 2.4 mg), which may affect cost. Compare providers directly for current pricing on your target dose.
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.