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- How GLP-1 medications work
- Mounjaro vs Wegovy compared
- Injection instructions
- Side effects & solutions
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- FAQs answered
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Mounjaro 5mg in the UK: Cost and Access Guide
Mounjaro 5mg is the first maintenance dose of tirzepatide, the GLP-1 receptor agonist and GIP receptor agonist injection licensed for weight management in UK adults. Access to Mounjaro depends on whether you choose the NHS route or private prescription. This guide explains the cost differences, how to access Mounjaro 5mg in the UK, and what the online prescription process involves so you can make an informed decision about your weight management options.
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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 Prescription Costs for Mounjaro 5mg in the UK
Mounjaro 5mg costs vary depending on whether you access it privately or through the NHS. Private prescription costs typically range from £150 to £250 per month for the 5mg dose, though prices vary between different GPhC-registered online prescribers. Each KwikPen contains four weekly injections, so a single pen lasts approximately four weeks. The cost usually includes the prescription fee and dispensing fee charged by the pharmacy. Most private providers offer subscription or pay-as-you-go options, allowing you to choose flexibility that suits your needs. Some clinics offer discounts for upfront payment of multiple months. Always compare costs across different providers before committing, as prices can vary significantly. When budgeting, remember that you may need to increase to a higher dose (such as 10mg or 15mg) over time, which will affect ongoing costs. Your prescriber can discuss dose progression and likely timescales during your initial consultation.
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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.
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NHS vs Private Access: Routes to Getting Mounjaro 5mg
NHS access to Mounjaro is through specialist tier 3 weight management services, not standard GP prescription. You must be referred by your GP to a local specialist service, where a multidisciplinary team assesses your eligibility and prescribes Mounjaro if appropriate. NHS provision is free at point of use but varies significantly by region—waiting lists can be months or even years in many areas. Private access is faster: you complete an online consultation with a UK-licensed prescriber, receive a prescription if clinically appropriate, and the pharmacy dispenses your Mounjaro. The online process typically takes 24–48 hours. Private access doesn't require NHS referral, making it a quicker option for eligible adults who can afford the cost. Both routes require a clinical assessment; you cannot buy Mounjaro without a valid prescription from a registered prescriber.
- 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 5mg cost on private prescription in the UK?
Private prescription costs for Mounjaro 5mg typically range from £150 to £250 per month depending on the provider. Each KwikPen contains four weekly doses. Prices vary between different GPhC-registered online prescribers, so it's worth comparing costs. Some providers offer discounts for paying multiple months upfront or subscription plans.
Can I get Mounjaro 5mg free on the NHS?
Yes, Mounjaro is available through the NHS via specialist tier 3 weight management services, but you must be referred by your GP. NHS provision is free but varies by region and has significant waiting lists in many areas. Private prescription is faster but involves upfront costs.
What's included in the cost of Mounjaro 5mg from a private prescriber?
The cost typically includes the prescription fee (the doctor's assessment and prescription) and the pharmacy dispensing fee. Some providers bundle these together in a single monthly price. Always check what's included before purchasing. You may also want to budget for potential dose increases over time.
How long does the online consultation take for a Mounjaro 5mg prescription?
The online consultation itself usually takes 15–30 minutes. After assessment, if you're approved, the prescription is issued and the pharmacy dispatches your Mounjaro within 24–48 hours. You'll need to provide medical history and current medications, so have these ready before your appointment.
Is Mounjaro 5mg the starting dose, and will I need a higher dose later?
No—5mg is the first maintenance dose. You start on 2.5mg for four weeks, then increase to 5mg. Many people progress to 10mg or 15mg over weeks or months depending on response and tolerability. Your prescriber will guide dose progression, which may increase your ongoing costs.
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