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 Do Mounjaro Injections Cost in the UK?
Mounjaro (tirzepatide) is a prescription-only weight management injection available in the UK through both NHS specialist services and private prescribing. Pricing varies significantly depending on where you access the medication — NHS availability is limited and regional, whilst private costs typically range from £129 to £320 per month depending on your dose. Understanding the cost structure and access routes helps you make an informed decision about whether this treatment is right for you.
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 Across UK Access Routes
NHS Mounjaro access: The medication is now approved by NICE for use within NHS specialist weight management services, but access is through tier 3 or tier 4 weight management clinics — not standard GP prescriptions. NHS supply is free at the point of use, but availability varies significantly by region (ICB). Many areas have waiting lists measured in months or years, and some regions have limited or no access due to funding constraints. You must be referred by your GP to an NHS specialist weight management service to be assessed.
Private Mounjaro pricing: Through GPhC-registered online pharmacies following a clinical assessment, costs typically range from £129–£320 per month depending on your dose (2.5mg to 15mg). Each KwikPen contains 4 weekly injections. Some private providers offer dose-tiered pricing where lower starting doses cost less than maintenance doses. Always check whether the price includes the clinical assessment fee.
- Starting dose (2.5mg): around £129–£180/month
- Mid-range doses (5–10mg): around £200–£280/month
- Maximum dose (15mg): around £300–£320/month
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.
Factors That Affect Your Mounjaro Cost
Several factors influence what you'll pay for Mounjaro: dose titration means you start on 2.5mg and increase every 4 weeks, so your monthly cost will rise as you progress. Prescription frequency — if you purchase multiple months upfront, some providers offer modest discounts. Private vs NHS — NHS is free but availability is restricted; private access is immediate but paid. Clinical assessment fees — some online prescribing services charge separate consultation fees (typically £15–£30) on top of medication cost. Use our free GLP-1 weight loss calculator to understand potential dose progression before committing to treatment, helping you budget for the full course.
Your eligibility for treatment also affects cost decisions: if you have a BMI of 30 or above, or 27–29 with weight-related health conditions (type 2 diabetes, high blood pressure, cardiovascular disease), you may qualify for private prescription. South Asian, Chinese, Black African, or Black Caribbean adults may qualify at BMI 27.5 or above due to higher health risks at lower BMI levels. Consider using our free BMI calculator to check where you sit on the NHS weight categories, which helps determine whether you're eligible and what your treatment timeline might look like.
- 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 private?
Mounjaro is free on the NHS, but access is severely limited — often with waiting lists of months to years, and availability varies by region. Private prescription costs £129–£320/month depending on dose, but is available immediately following a clinical assessment.
How much is one Mounjaro KwikPen?
One KwikPen contains 4 weekly doses (one month). Prices range from £129–£320 depending on strength (2.5mg to 15mg). Starting doses cost less; maximum dose (15mg) costs more.
Will Mounjaro become cheaper in the future?
As the market expands and patent protections evolve, costs may eventually decrease — similar to how other GLP-1 medications have become more affordable over time. NHS availability may also improve as funding increases.
Do private prescribing services offer payment plans?
Some private online pharmacies offer monthly subscriptions or payment plans, though these aren't universal. Check with individual providers — some offer 10–15% discounts for 3 or 6-month purchases.
Is there a difference in price between Mounjaro and Wegovy?
Wegovy (semaglutide) typically costs similar amounts (£150–£300/month depending on dose), though pricing varies by provider. Mounjaro uses tirzepatide, a dual GIP/GLP-1 agonist, whilst Wegovy is GLP-1 only — they're different medications with different mechanisms, not interchangeable based on price alone.
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.