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 Diet Injections — UK Cost and Access
Mounjaro (tirzepatide) is a prescription-only weight management injection licensed in the UK, but accessing it depends on whether you pursue NHS or private routes. The cost, availability, and timeline vary significantly between the two options. This guide explains how to access Mounjaro in the UK, what it costs, and what the clinical assessment process involves.
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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 vs Private Access — What's the Difference?
In the UK, you can access Mounjaro through two main routes: NHS specialist services or private prescription.
NHS access: NICE (National Institute for Health and Care Excellence) has approved tirzepatide for use within NHS specialist weight management services. However, access is through tier 3 or tier 4 specialist services, not standard GP prescription. You'll typically need a GP referral to a specialist weight management clinic in your area. NHS availability varies significantly by region — some areas have long waiting lists (months to years), while others may have limited availability. There is no NHS prescription cost once approved; you pay standard prescription charges (currently £9.90 per item in England for those not exempt).
Private access: You can obtain a private prescription for Mounjaro through GPhC-registered online prescribing services. This route doesn't require NHS referral and typically takes days rather than months. A UK-licensed prescriber conducts an online clinical assessment, and if appropriate, issues a prescription. You then pay the full private cost for the medication.
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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 Costs and the Online Prescription Process
Private Mounjaro costs in the UK typically range from approximately £129 to £350 per month, depending on the dose you're prescribed. The Mounjaro KwikPen contains four weekly doses, so costs vary by dose level (starting at 2.5 mg up to the maximum 15 mg). Your private prescription requires a clinical assessment via an online consultation with a UK-licensed prescriber — they'll review your medical history, current medications, and eligibility. If approved, you receive your prescription to be dispensed by a registered pharmacy. The entire process usually takes 3–7 days from consultation to receiving your first pen. Unlike NHS treatment, private prescriptions are not subject to waiting lists, making this route faster for those who can afford it.
To check your personal BMI and see whether you might qualify for weight loss treatment, use our free BMI calculator above. If you're considering Mounjaro, our GLP-1 weight loss calculator can help you estimate potential weight loss outcomes at different doses based on clinical trial data.
- 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 the NHS?
Once approved by an NHS specialist weight management service, Mounjaro costs the standard NHS prescription charge (£9.90 per item in England), or is free if you're exempt. However, accessing it through the NHS requires a referral and can involve long waiting lists. Regional availability varies significantly.
Can I get a Mounjaro prescription online in the UK?
Yes. You can obtain a private prescription for Mounjaro through GPhC-registered online prescribing services. An online clinical assessment with a UK-licensed prescriber takes around 10–20 minutes, and if approved, your prescription is issued within hours. You then pay the private cost.
What's the difference between Mounjaro and Wegovy for cost?
Both are prescription-only injections, but costs differ. Mounjaro (tirzepatide) typically costs £129–£350 monthly depending on dose. Wegovy (semaglutide) usually costs slightly less, around £129–£300 monthly. Both prices vary by provider and dose level. Your prescriber will advise which is more appropriate for you.
Do I need a GP referral to access Mounjaro privately?
No. Private online prescribing doesn't require a GP referral. You can book an online consultation directly with a prescriber, provide your medical history, and receive a prescription if clinically appropriate. However, it's good practice to inform your GP you're starting weight loss treatment.
How long does it take to get Mounjaro through the NHS versus privately?
NHS specialist services typically have waiting lists of weeks to years depending on your region and service capacity. Private online prescribing is much faster — usually 3–7 days from consultation to receiving your first pen. If speed is important to you, private prescription is the quicker route.
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.