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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Monjaro Pens Cost and Access in the UK
Monjaro pens (tirzepatide KwikPens) are available in the UK through both NHS specialist weight management services and private prescription routes, but costs and access vary significantly. This guide explains what you can expect to pay, how to access Mounjaro, and the differences between NHS and private options. Understanding your options helps you make an informed decision about whether this GLP-1 receptor agonist (and GIP receptor agonist) weight loss injection is right for you and your budget.
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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.
How Much Do Monjaro Pens Cost Privately in the UK?
Private prescription costs for Monjaro pens typically range from £129 to £320 per month, depending on the dose and provider. Initial doses (2.5 mg and 5 mg) are usually at the lower end of this range, while higher maintenance doses (10 mg to 15 mg) cost more. Each KwikPen contains four weekly injections, so a monthly cost covers approximately four weeks of treatment. Some providers offer discounts for upfront payment of multiple months, bringing the per-dose cost down. Important to note: private prescriptions require an initial online clinical assessment with a UK-licensed prescriber, typically costing £30–£50 separately. This assessment ensures tirzepatide is appropriate for your health profile and BMI. After initial assessment, many providers offer follow-up appointments at reduced cost or included in subsequent prescription fees. Costs can vary between providers, so comparing options is worth considering.
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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.
Free Weight Loss Tools & Guides
Everything you need to understand your weight, explore medication options, and track your progress — completely free.
NHS vs Private: How to Access Monjaro in the UK
NHS access to Monjaro is through specialist tier 3 weight management services, not your GP surgery. You'll need a GP referral to your local NHS integrated care board (ICB) weight management team. NHS prescriptions are free once approved, but availability varies dramatically by region—some areas have long waiting lists (6–18 months), while others have limited capacity. Private access is faster: book an online consultation with a UK-licensed prescriber, answer health questions, and receive a prescription within 24–48 hours if approved. Private route requires payment but skips NHS waiting lists. Your choice depends on urgency, budget, and local NHS availability. Use our free GLP-1 weight loss calculator to explore potential results and help decide if Monjaro suits your goals.
- 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.
What's included in the Monjaro pen price?
The monthly cost covers the KwikPen device containing four weekly injections at your prescribed dose. Needle costs are usually minimal or included. Storage and initial consultation fees are separate. Some private providers include follow-up support or dose escalation consultations in the price.
Can I get Monjaro free on the NHS?
Yes, Monjaro is free on the NHS once prescribed by a specialist tier 3 weight management service. You need a GP referral and will be assessed for eligibility based on BMI and health conditions. However, NHS waiting times vary widely by region—some areas have significant delays.
What's the difference between NHS and private Monjaro costs?
NHS Monjaro is free but involves waiting lists and regional availability challenges. Private prescriptions cost £129–£320 monthly but offer faster access without NHS referral. Private also requires upfront cost for initial clinical assessment (£30–£50).
Do I need an online consultation to get a private Monjaro prescription?
Yes, all private Monjaro prescriptions require an initial online clinical assessment with a UK-licensed prescriber. This typically takes 15–30 minutes, covers your medical history and BMI, and costs separately. Follow-up consultations are usually cheaper or included with repeat prescriptions.
Are there payment plans available for private Monjaro pens?
Some private providers offer payment plans, subscriptions, or discounts for paying multiple months upfront. Costs drop slightly with longer commitments. Always check with your chosen provider about financing options before committing.
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.