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
Mounjaro Cost in the UK — Where to Access It
Mounjaro (tirzepatide) is available in the UK through both NHS specialist services and private prescription routes, but costs and access vary significantly. The price you'll pay depends on which route you choose, your dose, and where you obtain your prescription. Understanding your options helps you make an informed decision about accessing this weight loss medication.
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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 Prescription Costs and Access Routes
Private prescription costs for Mounjaro in the UK typically range from £129 to £320 per month depending on your starting dose and the provider. Most private online services begin with the 2.5mg starter dose (around £129–£150), with maintenance doses at 5mg or higher costing more. Each KwikPen contains 4 doses (a 4-week supply), so your monthly cost reflects the specific dose you're prescribed. When comparing prices, check whether the consultation fee is included or separate, as some providers charge £25–£50 for the clinical assessment. Private access requires a prescription from a UK-licensed prescriber following an online consultation—no NHS referral is needed. You'll complete a health questionnaire and may have a video or telephone assessment. If approved, your prescription is dispensed by a GPhC-registered pharmacy. This route bypasses NHS waiting lists entirely, though you bear the full cost yourself.
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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 and Specialist Services
Accessing Mounjaro through the NHS requires referral to a tier 3 or tier 4 specialist weight management service—it is not available through standard GP prescription. Your GP can refer you if you meet eligibility criteria: a BMI of 30 or above, or 27–29.9 with weight-related health conditions like type 2 diabetes or cardiovascular disease. NHS access is free at point of use, but availability varies significantly by region and integrated care board (ICB). Waiting lists for NHS specialist services can extend several months to over a year in many areas. Once assessed, you may be offered Mounjaro alongside dietitian support and behaviour change programmes. Your prescriber will manage dose titration and monitor for side effects throughout your 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?
Yes, NICE has approved tirzepatide (Mounjaro) for weight management in NHS specialist services. However, you need referral to a tier 3 or 4 weight management service through your GP, and availability varies by region. Waiting lists can be lengthy—many areas have 6–12 month delays.
What's the typical cost of Mounjaro on prescription privately?
Private prescription costs range from approximately £129–£320 per month depending on your dose and provider. Starter doses (2.5mg) are usually cheapest, while higher maintenance doses (10mg–15mg) cost more. Always check if the consultation fee is included.
How do I access Mounjaro privately?
You can obtain a private prescription through an online consultation with a UK-licensed prescriber. Complete a health questionnaire, receive a clinical assessment, and if approved, your prescription is dispensed by a GPhC-registered pharmacy. No NHS referral needed.
How does Mounjaro's cost compare to Wegovy?
Both medications have similar private pricing ranges (£129–£320/month depending on dose), though Wegovy's lower maintenance dose (2.4mg) may be slightly cheaper per month. NHS coverage depends on regional availability for both. Compare your personal circumstances with a prescriber.
What should I check when comparing Mounjaro prices?
Check the dose cost, whether consultation fees are separate, delivery costs, and repeat prescription pricing. Verify the provider is GPhC-registered. Use our free GLP-1 weight loss calculator to understand potential outcomes before committing financially.
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.