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
Where to Get Mounjaro in the UK: Cost and Access Options
Finding affordable Mounjaro in the UK depends on whether you access it through the NHS or privately. Mounjaro (tirzepatide) is a prescription-only weight management injection licensed in the UK, but access routes, costs, and availability differ significantly between NHS specialist services and private prescribers. Understanding both options helps you make an informed decision about which route suits your circumstances and budget.
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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 Access to Mounjaro: Eligibility and Availability
The NHS offers Mounjaro through tier 3 specialist weight management services following NICE approval. To qualify for NHS prescription, you typically need a BMI of 30 or above, or BMI of 27–29.9 with a weight-related health condition such as type 2 diabetes, high blood pressure, or cardiovascular disease. However, NHS access is not assured and varies significantly by region. Your GP refers you to a local specialist service, but waiting lists can extend several months or longer in many areas. Once accepted into a tier 3 programme, Mounjaro is provided free on the NHS. The dose titration schedule starts at 2.5 mg and may increase to 15 mg maximum, with at least four weeks between dose escalations. NICE guidance supports Mounjaro use as part of a structured weight management programme alongside dietary and activity changes, not as a standalone treatment.
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.
Private Mounjaro Prescription: Cost, Speed, and Process
Private prescription routes typically offer faster access than NHS waiting lists. You can obtain tirzepatide through GPhC-registered pharmacies following an online clinical assessment with a UK-licensed prescriber. Private costs vary by provider and dose but generally range from £129 to £320 per month. Each Mounjaro KwikPen contains four weekly injections. Private prescribers assess your eligibility based on BMI and health history, and you receive a prescription without an NHS referral requirement. The assessment usually takes a few days, making private access faster for those who want to start treatment quickly. However, private costs are not subsidised and can accumulate over months of treatment. Use our free GLP-1 weight loss calculator to estimate potential outcomes and compare against costs to help you decide which access route is right for you.
- 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, Mounjaro (tirzepatide) is available through NHS tier 3 specialist weight management services following NICE approval. Access requires referral from your GP and eligibility assessment based on BMI and weight-related health conditions. However, availability and waiting times vary significantly by region and NHS trust. Once accepted, treatment is provided free, but the process can take many months.
How much does Mounjaro cost privately in the UK?
Private Mounjaro costs typically range from £129 to £320 per month, depending on the dose and provider. Starting doses (2.5 mg and 5 mg) are generally cheaper than higher maintenance doses (10 mg, 15 mg). Each KwikPen contains four weekly injections. Total annual costs can exceed £1500–£3500 depending on your dose trajectory.
How long is the waiting list for Mounjaro on the NHS?
NHS waiting times for tier 3 weight management services vary by region but typically range from three to twelve months or longer. Some areas have shorter waits; others have extensive backlogs. Contact your local NHS trust or weight management service for current waiting times in your area.
Can I get Mounjaro through my GP without specialist referral?
Standard NHS Mounjaro prescription requires referral to a tier 3 specialist weight management service. Your GP cannot directly prescribe Mounjaro on the NHS. However, you can obtain a private prescription through online clinical assessment without an NHS referral, which is faster but requires private payment.
What's the difference between Mounjaro and Wegovy for cost and access?
Both are GLP-1 or dual-agonist weight loss injections available privately in the UK. Mounjaro (tirzepatide) is a dual GIP+GLP-1 agonist with higher dose ranges; Wegovy (semaglutide) is GLP-1-only. Private costs are similar. NHS access for both requires tier 3 referral with similar waiting times and eligibility criteria. Clinical trial data showed Mounjaro achieved slightly higher average weight loss, though individual results vary significantly.
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.