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 in the UK?
Mounjaro (tirzepatide) pricing in the UK varies significantly depending on whether you access it through the NHS or via private prescription. The lowest cost option is typically through NHS specialist weight management services if you're eligible, though NHS access is limited and varies by region. Private prescription costs generally range from £150 to £300+ per month depending on your dose, with the starting dose (2.5 mg) usually being more affordable than higher maintenance doses. Understanding your eligibility and the different routes to access Mounjaro can help you find the most cost-effective option for your circumstances.
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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.
NHS Access vs Private: Understanding Your Options
NHS Mounjaro access is limited and reserved for specialist tier 3 and tier 4 weight management services. NICE has approved tirzepatide (Mounjaro's generic name) for NHS use, but availability varies significantly by region and integrated care board (ICB). If eligible through the NHS, you pay only the standard prescription charge (currently £9.90 in England), making this the lowest-cost option — however, NHS waiting lists can extend several months or longer in many areas, and not all regions have tier 3 specialist services available.
Private prescription routes do not require NHS referral or waiting lists. You'll need an online consultation with a UK-licensed prescriber, typically costing £10–£50 for the consultation. Once approved, the KwikPen injection is dispensed by a GPhC-registered pharmacy. Prices vary by dose: 2.5 mg starter pens are usually cheapest (around £150–£180), while 15 mg maximum-dose pens cost £280–£320 per month. Some private providers offer bundled packages or subscription discounts for longer commitments, potentially reducing monthly 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 Availability?
Several factors impact the price you'll pay for Mounjaro in the UK. Dose escalation — you typically start at 2.5 mg and increase weekly, so your first month's cost may be lower than months 3–6 when you're at a higher maintenance dose. Regional NHS variation — some ICBs commission tier 3 services more generously than others; London and major cities often have better NHS access than rural areas. Pharmacy competition — private pharmacy pricing varies, so comparing multiple registered pharmacies can reveal price differences of £30–£50 per pen. Use our free GLP-1 weight loss calculator to explore potential outcomes at different doses, then discuss costs with your prescriber or chosen pharmacy.
- 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.
What's the cheapest way to get Mounjaro in the UK?
If you're eligible for NHS specialist weight management services, the standard prescription charge (£9.90) is the cheapest option. Otherwise, private prescription costs typically range from £150–£300 per month depending on dose. Private pharmacies sometimes offer multi-month discounts. Check with your GP about NHS tier 3 service availability in your area first.
Why does Mounjaro cost more at higher doses?
Higher-dose KwikPens contain more tirzepatide, so they cost proportionally more. You start at 2.5 mg (cheapest) and gradually increase by 2.5 mg weekly up to 15 mg (most expensive). If you stabilise at a lower maintenance dose, your ongoing monthly cost will be lower than the maximum dose.
Can I get Mounjaro on the NHS without waiting months?
NHS access depends on your ICB and tier 3 service capacity. Some areas have waiting lists of 6–12+ months; others may offer faster access. Private prescription avoids NHS waiting lists but costs more. Contact your local weight management service for current waiting times.
Do all UK pharmacies charge the same price for Mounjaro?
No — private pharmacy pricing varies. A 5 mg KwikPen might cost £160–£190 depending on the pharmacy. It's worth comparing prices from multiple GPhC-registered pharmacies before committing. Some offer subscription discounts for repeat orders.
Is tirzepatide cheaper than Wegovy in the UK?
Pricing is similar — both typically cost £150–£320 per month privately depending on dose and pharmacy. Mounjaro generally reaches its maximum dose at a similar cost to Wegovy. Compare specific pharmacies' prices for your target dose rather than assuming one is always cheaper.
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.