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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5mg Monjaro in the UK — Cost, Access & How to Get It
The 5mg dose is typically the first maintenance dose of Mounjaro (tirzepatide), a GLP-1 receptor agonist weight loss injection licensed in the UK. If you're considering this medication, you'll want to know how to access it and what it costs. This guide explains the two main routes available to UK adults: NHS specialist services and private online prescribing. We'll cover eligibility, costs, and the clinical assessment process so you can understand your options clearly.
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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.
Private 5mg Monjaro Costs in the UK
Private prescription costs for 5mg Monjaro vary depending on the provider, but typically range from £150–£200 per month for a single 5mg pen. Each KwikPen contains four weekly injections (a one-month supply), so costs generally reflect a monthly subscription model rather than per-dose charges.
Private access routes include:
- Online pharmacies: GPhC-registered UK pharmacies offer online consultations with licensed prescribers. You complete a health questionnaire, speak with or are assessed by a prescriber, and if approved, receive a prescription and delivery within days.
- Private weight management clinics: Some private healthcare providers offer in-person or virtual consultations and can dispense medication directly.
- GP private prescriptions: Your own GP may issue a private prescription if you request it, which you then take to a pharmacy to be dispensed.
Costs typically include the prescriber consultation fee (£20–£50) plus the medication fee. Always check what's included in advertised pricing.
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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 — Which Route Is Right for You?
NHS access to 5mg Monjaro requires referral to a specialist tier 3 or tier 4 weight management service. Your GP can refer you, but NHS availability varies significantly by region — some areas have waiting lists of many months or years. If approved through the NHS, medication would be dispensed at no charge.
Private access is faster and doesn't require NHS referral, but comes at out-of-pocket cost. You can access a prescriber immediately through online consultations and begin treatment within 1–2 weeks. Eligibility is similar to NHS criteria: BMI of 30 or above, or 27–29.9 with weight-related health conditions. Use our GLP-1 weight loss calculator to estimate potential outcomes, and our BMI calculator to confirm your current status before seeking a prescription.
- 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 5mg Monjaro cost privately in the UK?
Private 5mg Monjaro typically costs £150–£200 per month (per KwikPen, which contains four weekly injections). Total costs may also include a prescriber consultation fee of £20–£50. Prices vary by provider, so compare different GPhC-registered online pharmacies for the best rates.
Can I get 5mg Monjaro on the NHS?
Yes, Monjaro is approved for NHS use through specialist tier 3 weight management services. Your GP can refer you, but NHS availability varies by region. Waiting lists can be lengthy (months to years in some areas). If approved, there is no medication cost, but you must meet eligibility criteria: BMI ≥30, or BMI 27–29.9 with weight-related health conditions.
What happens during an online consultation for 5mg Monjaro?
You complete a health questionnaire covering medical history, current medications, and weight management goals. A UK-licensed prescriber reviews this and may conduct a brief video or phone consultation. If suitable, they issue a prescription, which a GPhC-registered pharmacy then dispenses. The entire process typically takes 2–7 days from application to delivery.
Will 5mg Monjaro help me lose weight?
In clinical trials, 5mg Monjaro helped participants lose an average of around 15% of body weight over 72 weeks, alongside a reduced-calorie diet and increased physical activity. Individual results vary significantly depending on adherence, lifestyle changes, and personal metabolism. A prescriber will discuss realistic expectations during your assessment.
Do I need a GP referral for private 5mg Mounjaro?
No. Private online prescribing does not require a GP referral. You can apply directly to a GPhC-registered online pharmacy and be assessed by their licensed prescriber. However, it's helpful to inform your GP that you're seeking weight loss treatment so they can monitor your progress and adjust any other medications if needed.
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.