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
What Do Mounjaro Injections Cost in the UK?
Mounjaro injection prices in the UK vary significantly depending on whether you're accessing the medication through the NHS or via private prescription. Private costs typically range from around £129 to £320 per month, though this varies by dose and provider. NHS access through specialist weight management services is free at the point of use, but availability and waiting times differ considerably across regions. Understanding the full cost picture—including what dose you're prescribed and how pricing is structured—helps you make an informed decision about weight loss treatment options.
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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.
Mounjaro Pricing: NHS vs Private Access
Private Mounjaro pricing: Through GPhC-registered online pharmacies following a clinical assessment, costs typically range from £129 per month at the lowest dose (2.5 mg) to £280–£320 per month at higher maintenance doses (10–15 mg). Each KwikPen contains four weekly injections, so monthly costs reflect a four-week supply. Prices vary between providers, so it's worth comparing different services.
- Starting dose (2.5 mg): approximately £129–£150/month
- Escalation doses (5–7.5 mg): approximately £180–£220/month
- Maintenance doses (10–15 mg): approximately £250–£320/month
NHS access: Mounjaro is available free through NHS specialist tier 3 weight management services, but regional availability is extremely limited. Many areas have no current access or very long waiting lists (6–18 months in some regions). Your GP can refer you to your local ICB weight management service if you meet eligibility criteria.
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 Injection Costs?
Several factors influence the total cost of Mounjaro treatment. Dose escalation: You start at 2.5 mg and increase gradually over 16+ weeks, so initial months cost less than maintenance therapy. Treatment duration: Most people continue for 6–12 months minimum, meaning total costs range from £800–£3,840+ depending on how long you take it. Additional costs: Some providers include the clinical assessment within the quoted price; others charge separately (typically £20–£50). Using our free GLP-1 weight loss calculator can help you estimate potential outcomes and plan your budget accordingly.
- 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 than Wegovy?
Pricing is similar—both typically range from £129–£320 per month depending on dose. Direct comparison depends on your specific dose and provider. Mounjaro starts at 2.5 mg (lower initial cost), while Wegovy starts at 0.25 mg. Ask each provider for a quote at your prescribed dose before deciding.
Do I need to pay for a clinical assessment separately?
It depends on the provider. Some online pharmacies include the clinical assessment cost within their quoted monthly price. Others charge £20–£50 separately. Always confirm the full cost before starting treatment, including any repeat assessment fees.
Can I get Mounjaro free on the NHS?
Yes, through NHS specialist weight management services (tier 3), but availability is extremely limited and varies by region. Waiting lists can be 6–18+ months. Ask your GP whether your local ICB offers Mounjaro access and what the current waiting time is.
What's included in the Mounjaro monthly price?
The quoted monthly price typically covers the KwikPen (four weekly injections) and sometimes the clinical assessment. Delivery and repeat assessments may be charged separately depending on the provider. Check the full terms before committing to a purchase.
Can I switch from Mounjaro to a cheaper alternative?
Wegovy and Saxenda are alternative GLP-1 options with similar pricing. Mounjaro is a dual GIP/GLP-1 agonist, so it works differently. Any switch between medications must be managed by your prescriber—never stop or change medication without professional guidance.
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.