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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How Much Does Mounjaro 5mg Cost in the UK?
Mounjaro 5mg is the first standard maintenance dose of tirzepatide available in the UK, but pricing varies significantly depending on whether you access it through the NHS or privately. The cost of Mounjaro depends on your route to prescription, your region, and the provider you choose. Understanding the full cost picture — including consultation fees and ongoing expenses — helps you make an informed decision about whether this weight management injection is right for your budget and health needs.
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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 Mounjaro 5mg Cost in the UK
Private Mounjaro costs typically range from £130 to £200 per month for the 5mg dose, though prices vary between GPhC-registered online pharmacies and weight management clinics. A standard KwikPen contains 4 weeks of doses, so monthly cost usually covers one pen. Online consultations with a UK-licensed prescriber typically cost £50 to £150 and are often required before your first prescription. Some providers offer package pricing for multiple months upfront, which can reduce per-month costs. Initial consultations assess your eligibility based on BMI and weight-related health conditions — the same criteria the NHS uses. After your first prescription, follow-up consultations for dose escalation or monitoring may cost £40–£100 each. Use our GLP-1 weight loss calculator to estimate potential outcomes at the 5mg dose to help decide if private access is worth the investment.
Clinically BackedWeight Loss
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.
NHS vs Private Access to Mounjaro 5mg
NHS route: Mounjaro is available through NHS specialist tier 3/4 weight management services following GP referral, but access is limited and varies dramatically by region. Some ICBs have substantial waiting lists of 12–24 months; others have limited availability. You must meet eligibility criteria: BMI 30 or above, or BMI 27–29.9 with weight-related health conditions (hypertension, type 2 diabetes, sleep apnoea). Once approved, NHS prescriptions are free at the point of use — no medication cost, though you may pay standard prescription fees (currently £9.90 per item in England).
Private route: Faster access (typically 1–7 days from consultation to delivery) without NHS referral. No waiting lists. Requires online clinical assessment and prescription from a UK-licensed prescriber. Total cost is higher upfront but may suit those unable to access NHS services quickly or who need faster treatment initiation.
- 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.
Is Mounjaro 5mg cheaper on the NHS than privately?
Yes — on the NHS, Mounjaro is free at the point of use (you pay standard prescription charges only), whereas private costs are £130–£200 monthly plus consultation fees. However, NHS access involves waiting times and regional availability limits. Private access is faster but costlier.
What does a Mounjaro 5mg KwikPen cost to buy privately?
A single KwikPen (4 weeks of 5mg doses) costs approximately £130–£200 privately, depending on the provider. Prices vary between online pharmacies and specialist clinics. Some offer discounts for bulk purchases or subscription models.
Why is Mounjaro 5mg different from starting doses if I'm going private?
The 5mg dose is the first maintenance dose after the 4-week 2.5mg starting phase. Most private prescribers recommend following the standard dose titration schedule from 2.5mg upward to minimise side effects. Jumping to 5mg without the 2.5mg initiation phase increases nausea and GI upset risk.
Does private Mounjaro cost less than Wegovy in the UK?
Costs are broadly similar — both tirzepatide and semaglutide are priced around £130–£200 monthly through private providers. Mounjaro (tirzepatide) may have slightly different pricing than Wegovy depending on the pharmacy, but the difference is typically small. Compare providers directly.
Can I get a cheaper Mounjaro prescription through my GP without NHS referral?
No — private prescription costs are set by individual providers and vary. Your GP cannot prescribe Mounjaro privately unless they're acting as an independent prescriber, which is rare. NHS prescription is free (except standard charges) but involves waiting. Use our BMI calculator to confirm your eligibility for either 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.