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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Mounjaro Cheapest Prices in the UK
Mounjaro (tirzepatide) is a prescription-only weight management injection, and UK pricing varies significantly depending on whether you access it through the NHS or privately. There is no single "cheapest" price because costs depend on your dose, the provider, and your eligibility pathway. This guide explains how NHS and private Mounjaro pricing works in the UK, so you can understand what to expect and make informed decisions about accessing this medication safely.
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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 Mounjaro Costs Differ: NHS vs Private Access
NHS access: Mounjaro is available through the NHS, but only via specialist tier 3 or tier 4 weight management services. If you access Mounjaro through the NHS, there is no prescription charge beyond your standard NHS prescription fee (currently £9.90 in England, or free if you're exempt). However, NHS availability varies dramatically by region and ICB (Integrated Care Board), and waiting lists can extend months or years in many areas. NICE has approved tirzepatide for NHS use, but this does not assures immediate access in your region.
- Private access: Through GPhC-registered online pharmacies, Mounjaro costs typically range from £129 to £320+ per month depending on your dose. Lower doses (2.5–5 mg) are cheaper; higher doses (10–15 mg) cost more. Private prescribers complete a clinical assessment and issue a prescription if you're eligible.
- What affects private cost: Your specific dose, how many pens you need, the pharmacy provider, and any discounts for longer-term supplies.
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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.
Understanding Mounjaro Eligibility and Dose Escalation
Before considering cost, check you're eligible. You may qualify for Mounjaro if you have a BMI of 30 or above, or 27–29.9 with weight-related health conditions (type 2 diabetes, high blood pressure, sleep apnoea, or cardiovascular disease). South Asian, Chinese, Black African, or Black Caribbean adults may have lower thresholds. Mounjaro starts at 2.5 mg per week and escalates every 4 weeks to a maximum of 15 mg. Each dose level costs differently, and you cannot jump doses — this means your monthly cost will increase as you titrate upward. Use our free GLP-1 weight loss calculator to explore potential outcomes at different doses and better understand what investment might be involved in your journey.
- 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.
Can I get Mounjaro cheaply on the NHS?
Yes, if available in your region. NHS Mounjaro costs only the standard prescription fee (£9.90 per prescription in England, free if exempt). However, specialist weight management services have long waiting lists and limited capacity. Availability depends on your local ICB and commissioning decisions, so contact your GP to check if your area offers it.
What's the typical private cost of Mounjaro in the UK?
Private Mounjaro typically costs £129–£320+ per month depending on dose. Starting doses (2.5–5 mg) are cheaper; maximum doses (15 mg) are most expensive. Prices vary between providers, so compare GPhC-registered pharmacies. Some offer bulk discounts for 3–6 month supplies.
Is Mounjaro cheaper than Wegovy in the UK?
Pricing is similar, though they vary by dose and provider. Mounjaro may be fractionally cheaper at some doses because the starting dose is higher (2.5 mg vs 0.25 mg for Wegovy). Compare both medications across providers—neither is consistently cheaper. Your prescriber may recommend one over the other based on clinical factors, not cost.
Do I need a higher dose if I want better results?
Not necessarily. Clinical trials showed meaningful weight loss at the 5 mg dose. Higher doses (10–15 mg) may produce greater average weight loss, but individual results vary widely. Your prescriber will escalate your dose gradually and may keep you on a lower, effective dose. More expensive doesn't always mean better outcomes for you personally.
Why is there such a big price difference between NHS and private?
NHS pricing reflects UK healthcare commissioning and bulk purchasing agreements. Private pricing includes prescriber consultations, pharmacy dispensing, and variable supply costs. Neither route is inherently "better"—NHS is cheaper but has waiting lists and regional restrictions; private is faster but you pay directly.
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.