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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5ml Mounjaro in the UK: Cost, Access and How to Get It
Mounjaro (tirzepatide) is available in the UK through both NHS specialist services and private prescription routes, but access and costs differ significantly. A 5ml KwikPen contains four weekly doses of a specific strength. Understanding your options — whether NHS or private — helps you make an informed decision about accessing this weight management medication. This guide covers UK costs, eligibility, and the steps involved in getting a prescription.
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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.
Mounjaro Cost and Private Access Routes in the UK
Private prescription costs for Mounjaro in the UK typically range from £129 to £320 per month depending on your dose and the provider. A standard 5ml KwikPen (containing four weekly injections) costs approximately £130–£150 at entry-level doses, rising to £250–£320 at higher maintenance doses like 15mg. These costs are not covered by the NHS when obtained privately.
What the cost includes: the medication, clinical assessment, ongoing prescriber support, and delivery to your home. Some providers offer discounted packages for longer-term commitments. Always check whether follow-up consultations are included — some charge per consultation, others include them.
- Starting doses (2.5–5mg) typically cost £130–£160 per pen
- Mid-range doses (7.5–10mg) typically cost £180–£220 per pen
- Maximum doses (12.5–15mg) typically cost £250–£320 per pen
Prices vary between providers and can change, so always confirm current pricing before committing. Compare providers carefully — the cheapest option is not always the best if customer support or clinical oversight is limited.
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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 Access vs Private: Understanding Your Options
NHS route: Mounjaro is available through specialist tier 3 and tier 4 weight management services. You'll need a GP referral, and access is free on the NHS once prescribed. However, waiting lists can be very long — sometimes 6–18 months or longer depending on your area (Integrated Care Board). Not all regions have equal access; some areas have very limited capacity.
Private route: You can access Mounjaro through a private online consultation with a UK-licensed prescriber without waiting for NHS referral. The process typically takes 1–2 weeks. You'll complete a health questionnaire, have a consultation (video or telephone), and if approved, receive a prescription valid at GPhC-registered pharmacies. This route requires upfront payment but offers faster access and predictable timelines.
- NHS: Free but long waiting lists; requires GP referral
- Private: Faster access; requires payment; no referral needed
- 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 a 5ml Mounjaro pen cost in the UK?
Private costs typically range from £130–£320 per pen depending on dose strength. Starting doses cost around £130–£160; maximum doses (15mg) cost £250–£320. NHS prescription is free once approved, but NHS access involves waiting lists.
Can I get Mounjaro on the NHS?
Yes, Mounjaro is available through NHS specialist weight management services (tier 3/4). You need a GP referral and must meet eligibility criteria (BMI 30+ or BMI 27+ with weight-related health conditions). Waiting times vary by region, often 6–18 months.
What's included in the private cost of Mounjaro?
Private costs typically include the medication, initial clinical assessment, the prescription, and home delivery. Some providers include follow-up support; others charge separately. Always confirm what's included before purchasing.
How long does a 5ml Mounjaro pen last?
A 5ml KwikPen contains four weekly doses. One pen lasts approximately four weeks. You'll need roughly 13 pens per year for continuous treatment, though dosing starts low and increases over time.
Do I need a UK GP to get Mounjaro privately?
You don't need a referral from your GP for private Mounjaro, but you must be registered with a UK GP. The private prescriber will assess your medical history and may contact your GP. You must be a UK resident aged 18 or over.
Ready to take control of your weight loss journey?
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