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
Free tracker included with every download this week
How Much Does Mounjaro Cost Per Month in the UK?
Mounjaro (tirzepatide) costs between approximately £129 and £320 per month in the UK, depending on your dose and whether you're accessing it privately or through the NHS. The exact price varies by private prescriber and pharmacy, as Mounjaro is a prescription-only medicine requiring clinical assessment. If you're eligible for NHS access through a specialist weight management service, you won't pay a prescription charge (or pay the standard £9.90 charge if applicable). Understanding the full cost picture — including what's included in the price and payment options — helps you make an informed decision about this weight loss injection.
10,000+ calculations today · NHS-aligned thresholds · 100% free
Calculate Your BMI Instantly
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.
Mounjaro Pricing by Dose and Access Route
Private prescription costs: Mounjaro typically ranges from £129–£320 per month depending on your dose. Lower doses (2.5 mg and 5 mg) are at the lower end, while higher maintenance doses (10 mg, 12.5 mg, 15 mg) are at the upper end. Prices vary between GPhC-registered online pharmacies and prescribers, so comparing options is worthwhile. Each KwikPen contains four weeks' supply (four injections), so monthly costs cover one pen. NHS access: Through tier 3 specialist weight management services, Mounjaro is available without the medication cost (you pay only the standard prescription charge of £9.90 if you're not exempt). However, NHS access involves waiting lists and regional variation — some areas have longer delays than others. Private access bypasses NHS waiting lists but requires upfront payment. During dose titration (weeks 1–20+), you'll move through lower doses before reaching your maintenance dose, so early-month costs may be lower than final maintenance costs.
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.
What Affects Mounjaro Pricing and How to Access It
Mounjaro pricing depends on several factors: your current dose level, whether you're using an NHS or private route, and your prescriber. Some online prescribers offer package discounts for multi-month purchases, while others charge per month. Storage costs are included in the price. Your GP can refer you to a specialist weight management service to explore NHS options, though waiting times can be significant. Privately, you'll need an online clinical assessment with a UK-licensed prescriber before a pharmacy can dispense your prescription. Use our GLP-1 weight loss calculator to estimate what dose you might eventually reach, which helps you understand final-stage costs. Weight loss typically requires taking Mounjaro consistently over months, so budgeting for ongoing costs is important. Always check that your chosen prescriber is registered with the General Pharmaceutical Council (GPhC) for safe, regulated care.
- 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 cheaper on the NHS or privately in the UK?
On the NHS through specialist weight management services, you pay only the standard prescription charge (usually £9.90 if not exempt), so it's significantly cheaper upfront. Privately, you pay £129–£320 per month depending on dose. However, NHS waiting lists can be months long, so some people choose private access for faster availability despite the cost difference.
Does the Mounjaro cost change as I increase my dose?
Yes. During dose titration (weeks 1–20+), you start at 2.5 mg and increase gradually — lower doses cost less initially. Once you reach your maintenance dose (often 10–15 mg), the monthly cost stabilises at the higher end of the range. Budget accordingly as you progress through dose increases.
What's included in the Mounjaro monthly cost?
The monthly cost covers the Mounjaro KwikPen itself (four weeks' supply), the prescription fee, and dispensing. It typically does not cover clinical consultations (some prescribers bundle these, others charge separately). Storage and delivery may be included or charged separately depending on the pharmacy.
Can I get Mounjaro on prescription from my GP without a specialist referral?
In most NHS areas, GPs cannot prescribe Mounjaro directly for weight management — you need referral to a tier 3 specialist weight management service. Privately, you can access it through an online prescriber without an NHS referral, though you still need a clinical assessment to confirm it's suitable.
How does Mounjaro pricing compare to Wegovy in the UK?
Both cost similarly in the private market (roughly £129–£320 per month depending on dose). Mounjaro reaches a maximum of 15 mg weekly, while Wegovy reaches 2.4 mg weekly. Pricing differences between them are usually minimal, so cost alone shouldn't be the deciding factor — individual suitability and prescriber preference matter more.
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.