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
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Mounjaro Experiences in the UK: Cost and Access
If you're considering Mounjaro (tirzepatide) for weight management in the UK, understanding how to access it and what it costs is essential. Mounjaro is available through both NHS specialist services and private prescription routes, each with different timelines, costs, and eligibility pathways. This guide explains both options and what to expect when exploring Mounjaro as part of your weight management journey.
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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.
Private Prescription Costs and Access Routes
Private Mounjaro costs in the UK typically range from £129 to £320 per month depending on your dose and the prescribing provider. Costs vary because tirzepatide pricing differs across private prescribers, and you pay only for the specific dose you've been prescribed, not a full KwikPen if you're starting at a lower dose.
- Starting doses (2.5 mg) are usually at the lower end of the price range
- Higher doses (10 mg to 15 mg) typically cost more per month
- Some providers offer dose-based pricing rather than flat monthly rates
- Many private prescribers allow you to pause or stop at any time without contract commitment
Access through private prescription involves an online clinical assessment with a UK-licensed prescriber. The assessment considers your BMI, weight-related health conditions (such as type 2 diabetes or high blood pressure), medical history, and current medications. If approved, your prescription is sent to a GPhC-registered pharmacy for dispensing, usually within 24–48 hours.
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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.
Free Weight Loss Tools & Guides
Everything you need to understand your weight, explore medication options, and track your progress — completely free.
NHS Access vs Private: Timelines and Eligibility
NHS access to Mounjaro is through specialist tier 3/4 weight management services, not your GP surgery directly. You'll need a GP referral, though availability varies significantly across different ICBs (Integrated Care Boards) in the UK. In many areas, NHS waiting lists for specialist weight management services extend to many months or longer.
The main trade-off: NHS provision is free at the point of use, but access is limited and waitlists can be extensive. Private prescription routes have no waiting list—you can typically start within days of your online assessment—but costs are your responsibility. Some people choose private access now and transition to NHS later if their regional service becomes available.
When comparing costs, consider that Mounjaro vs Wegovy pricing may differ slightly across providers, though both tirzepatide and semaglutide are similarly priced in the UK private market. Our GLP-1 weight loss calculator can help you project potential outcomes at different doses to help inform your decision.
The online assessment process for private Mounjaro is straightforward. You'll complete a health questionnaire covering your weight, height (to calculate BMI), medical conditions, current medications, and any allergies. A UK-licensed prescriber reviews your information, usually within 24 hours. If approved, they issue a prescription; if additional information is needed, the clinic will contact you. Once prescribed, your local pharmacy receives the prescription electronically and dispenses your KwikPen. Most people receive their first KwikPen within 2–3 days. You'll be advised on storage (refrigerated until use, then room temperature for up to 30 days after opening) and injection technique, often with instructional videos provided.
- 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.
How much does Mounjaro cost on the NHS in the UK?
Mounjaro is free on the NHS if prescribed through a specialist weight management service. However, NHS access requires a GP referral and is subject to regional availability. Waiting times for NHS specialist services vary widely, from weeks to many months depending on your local ICB. Private prescription costs typically range from £129–£320 per month.
Can I get Mounjaro through my GP surgery?
No. Mounjaro for weight management is not routinely prescribed in general practice. You need a referral from your GP to a specialist tier 3 or tier 4 weight management service. Alternatively, you can access Mounjaro through private online prescription without an NHS referral.
How long does it take to receive Mounjaro after an online assessment?
If approved through private prescription, you typically receive your KwikPen within 2–3 days. Your prescription is sent electronically to a GPhC-registered pharmacy, which dispenses and ships it to you. NHS timelines depend on your local service; first appointments can take months.
What should I do if I'm eligible for Mounjaro but the NHS waiting list is very long?
Some people choose private prescription to start treatment immediately while remaining on the NHS waiting list. If you later access the NHS service, you can discuss continuity with your prescriber. Weigh the cost against the benefit of earlier access to treatment when making your decision.
Does Mounjaro eligibility differ by region in the UK?
Yes. NHS access eligibility and availability vary by ICB. Some regions have more established weight management services; others have longer waits or stricter thresholds. Your GP can advise whether your regional service is currently accepting referrals and what the expected waiting time is.
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.