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 Munjaro Cost in the UK?
Munjaro (tirzepatide) costs vary significantly in the UK depending on whether you access it through the NHS or private prescription routes. As a prescription-only weekly weight loss injection, costs range from approximately £129 to £320 per month through private prescribing. NHS access is free at the point of use but availability depends on your local integrated care board. Understanding your options helps you make an informed decision about accessing this GLP-1 receptor agonist treatment.
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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.
Private Munjaro Costs in the UK
Private prescription costs for Munjaro in the UK typically range from £129 to £320 per month, depending on your dose and the prescribing provider. A standard KwikPen contains four weekly injections, so monthly costs reflect one month's supply at your current dose level.
- Starting doses (2.5mg) are usually at the lower end of this range
- Maintenance doses (10–15mg) are typically at the higher end
- Costs may vary slightly between different UK online prescribers
- Some providers offer dose escalation packages where you pay a set amount as you increase doses
- Private prescriptions are issued by UK-licensed prescribers following an online clinical assessment
Private costs are out-of-pocket expenses—not covered by the NHS. However, you avoid waiting lists typical of NHS specialist weight management services. The KwikPen device itself is included in the cost and does not require separate purchase.
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 Access vs Private Cost
NHS route: Munjaro is free on prescription through NHS specialist tier 3 weight management services. However, NHS availability varies significantly by region, and waiting lists can exceed 12 months in many areas. You must be referred by your GP and meet local eligibility criteria.
Private route: Costs £129–£320 monthly but offers immediate access without NHS waiting lists. You consult with a UK-licensed prescriber online, receive a prescription if suitable, and order through a GPhC-registered pharmacy. Both routes require a clinical assessment—the difference is speed and convenience versus cost. Use our GLP-1 weight loss calculator to explore potential outcomes at different doses, helping you decide if private investment is worthwhile for your goals.
- 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 Munjaro free on the NHS in the UK?
Munjaro is available free through NHS specialist weight management services (tier 3), but access is limited by waiting lists and regional availability. Your GP can refer you, but eligibility and timeline vary significantly depending on your location and local integrated care board funding.
What is included in the monthly Munjaro cost?
The monthly cost includes the KwikPen device (containing four weekly injections) for your current dose. You do not pay separately for needles, devices, or administration—the full cost is the prescription price. Storage and usage are your responsibility after purchase.
Can I get Munjaro cheaper than £129 per month?
NHS access is free, but waiting lists are long. Private costs start around £129 monthly for lower doses. Some providers offer payment plans or dose escalation packages, but comparison across GPhC-registered pharmacies is advisable. Always verify prescriber credentials before purchasing.
How long does a Munjaro pen last?
Each KwikPen contains four weekly injections—enough for one month of once-weekly treatment. At your maintenance dose, you would need 12 pens annually, costing approximately £1,548–£3,840 per year privately, depending on your dose.
What happens if Munjaro is too expensive for me?
Discuss this with your GP, who can explore NHS referral options or suggest alternative approaches like structured weight loss programmes. Some online prescribers offer lower-dose options to reduce cost, though clinical suitability must be assessed. Your GP can advise on what's appropriate for your health needs.
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.