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 Cost Per Month in the UK?
Mounjaro (tirzepatide) costs vary significantly depending on whether you access it through NHS specialist services or private prescription routes in the UK. Through the NHS, there is no direct cost to eligible patients, though availability depends on your region's specialist tier 3 weight management services. Through private online prescribing, costs typically range from £129 to £320 per month depending on your dose and provider. Understanding your options and eligibility will help you make an informed decision about this prescription weight loss injection.
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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 vs Private Mounjaro Costs in the UK
NHS route: If prescribed through NHS specialist weight management services, Mounjaro is dispensed free under your prescription exemption (unless you pay standard prescription charges of £11.90 per item as of 2024). However, access through the NHS is limited. NICE has approved tirzepatide for use in specialist services, but availability varies significantly by region. Many NHS areas have waiting lists lasting months to years for tier 3 weight management services. Your GP can refer you to your local service, but you must meet eligibility criteria: BMI of 30 or above, or 27–29.9 with weight-related health conditions such as type 2 diabetes, hypertension, or cardiovascular disease. For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, lower BMI thresholds (27.5+) may apply.
Private route: Private online prescribing offers faster access without waiting lists. A UK-licensed prescriber assesses your medical history through an online consultation. If approved, your prescription is dispensed by a GPhC-registered pharmacy. Costs depend on dose and provider but typically range from £129–£320 monthly. The Mounjaro KwikPen contains 4 weeks of doses, so monthly cost is the cost per pen.
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.
Mounjaro Dose and Monthly Cost Breakdown
Mounjaro pricing through private providers varies by dose. Starting doses (2.5 mg) are usually less expensive than higher maintenance doses (15 mg), though price differences between providers can be significant. Most private providers offer tirzepatide UK prescriptions at competitive rates, so comparing options is worthwhile. The NHS does not publish specific Mounjaro costs because it negotiates prices centrally and eligible patients pay standard prescription charges only. If you are considering private access, factor in the cost of the online consultation (typically £20–£50) in addition to the medication cost. Using our free GLP-1 weight loss calculator can help you understand potential outcomes at different doses, which may help inform your decision about whether to pursue treatment.
- 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 available on the NHS in the UK?
Yes, NICE has approved tirzepatide (Mounjaro) for NHS use in specialist tier 3 weight management services. However, availability is limited and varies by region. Your GP can refer you if you meet eligibility criteria (BMI ≥30, or ≥27 with weight-related health conditions), but waiting lists can be long in many areas.
How much does Mounjaro cost privately per month?
Private prescribing costs typically range from £129–£320 per month depending on your dose and provider. The KwikPen contains 4 weeks of doses. Starting doses (2.5 mg) are often cheaper than maximum doses (15 mg). Add the consultation fee (£20–£50) to your total first-month cost.
What's the difference between Mounjaro and Wegovy in terms of UK cost?
Both are available through NHS specialist services (prescription charges only) and private prescribing. Private costs are similar (£129–£320/month), though exact prices vary by provider. Mounjaro uses a dual GIP+GLP-1 mechanism, while Wegovy is a GLP-1 agonist only. A prescriber will advise which is more suitable for you.
Do I have to pay for Mounjaro on the NHS?
If prescribed through NHS specialist services, you pay standard NHS prescription charges (£11.90 per item as of 2024) unless you're exempt. There are no additional medication costs. Private prescribing involves direct out-of-pocket payment to the provider.
How do I check if I'm eligible for NHS Mounjaro?
Contact your GP to discuss weight management referral. You must have a BMI of 30+, or 27–29.9 with weight-related conditions (diabetes, high blood pressure, cardiovascular disease). Your GP will refer you to your local tier 3 specialist weight management service, which will conduct a full clinical assessment to confirm eligibility.
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.