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- 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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Mounjaro Injection Price Increase in the UK
Mounjaro (tirzepatide) prices have risen in recent months, affecting both NHS and private access routes in the UK. If you're considering this weekly weight loss injection for managing obesity or weight-related health conditions, understanding current costs and where to access it is essential. This guide explains what's driving price increases, how much Mounjaro costs privately, and how the NHS prescribing pathway works.
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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.
Current Mounjaro Costs in the UK Private Market
Private Mounjaro costs in the UK have increased, with typical prices now ranging from approximately £150 to £320 per month depending on your dose and prescriber. Starting doses (2.5 mg) are generally cheaper, while higher maintenance doses (15 mg maximum) cost more. Price varies between private online pharmacies and clinics—it's worth comparing options before committing.
Several factors drive these increases: supply chain pressures, manufacturing costs, and growing demand for GLP-1 and dual GIP/GLP-1 receptor agonist medications across the UK. Each KwikPen contains four weekly injections (one month's supply). When calculating true cost, remember you may need to escalate doses over 16–20 weeks, meaning initial months cost less than later maintenance months.
- Starting dose (2.5 mg): typically £150–£180/month
- Mid-range dose (10 mg): typically £220–£280/month
- Maximum dose (15 mg): typically £280–£320/month
These prices are subject to change and vary by provider. Always check current pricing directly with prescribers before starting treatment.
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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.
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NHS Access vs Private Routes — Which Path Is Right?
NHS route: Free once prescribed, but involves referral to a specialist tier 3 weight management service and significant waiting lists (often 6–18 months depending on your region). NICE has approved tirzepatide for NHS use, but availability depends on your integrated care board (ICB). Your GP can refer you, but there's no assures of access or timeline.
Private route: Faster access (typically within 1–2 weeks of online consultation), but you pay the full cost. You'll complete an online clinical assessment with a UK-licensed prescriber, receive a prescription if suitable, and collection happens through a GPhC-registered pharmacy. Use our free GLP-1 weight loss calculator to estimate potential outcomes, and our BMI calculator to establish your baseline before starting any treatment.
Most people access Mounjaro privately due to NHS waiting times, though this means bearing the full cost yourself. Combine any weight loss medication with reduced-calorie diet and increased physical activity for best results.
- 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.
Why have Mounjaro prices increased in the UK?
Prices have risen due to increased demand for GLP-1 and GIP/GLP-1 receptor agonist medications, manufacturing and supply chain costs, and the need to import from overseas manufacturers. Currency fluctuations and growing NHS prescribing also impact availability and pricing in the private market.
Is Mounjaro available on the NHS in the UK?
Yes, NICE has approved tirzepatide (Mounjaro) for NHS use through specialist weight management services. However, availability varies by region and waiting lists are typically very long. Access requires GP referral to a tier 3 or tier 4 specialist service. Check with your local integrated care board for current availability and waiting times.
How much does a month's supply of Mounjaro cost privately?
Private costs typically range from £150 to £320 per month depending on dose. Starting doses (2.5 mg) cost less (~£150–£180), while maximum doses (15 mg) cost more (~£280–£320). Prices vary between prescribers and pharmacies, so compare options before starting treatment.
What's included in the price of a Mounjaro KwikPen?
One KwikPen contains four pre-filled weekly doses (one month's supply). The price covers the medication only—not the clinical consultation (which may be charged separately by your prescriber) or any follow-up support, though many online prescribers include these as part of their service.
Can I get Mounjaro more cheaply anywhere else?
Prices are set by individual prescribers and pharmacies—there's no "cheaper" official source. Always use a UK-licensed prescriber and GPhC-registered pharmacy. Be cautious of unusually low prices, as these may indicate unsafe or counterfeit medication. Verify credentials before purchasing any prescription medication online.
Ready to take control of your weight loss journey?
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