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
How to Access Mounjaro via NHS Wales
Accessing Mounjaro (tirzepatide) in Wales depends on whether you pursue NHS or private prescription routes. NHS Wales offers tirzepatide through specialist weight management services, but availability varies significantly across health boards and waiting lists can be lengthy. Alternatively, you can obtain a private prescription following an online clinical assessment with a UK-licensed prescriber. This guide explains both pathways, eligibility criteria, and realistic costs so you can make an informed decision about weight management options in Wales.
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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 & Online Access in the UK
Private Mounjaro prescriptions are available in the UK through online pharmacies following a clinical assessment with a licensed prescriber. Costs typically range from £129 to £320 per month depending on your dose. The Mounjaro KwikPen contains four weekly injections (one month's supply), so you pay one prescription cost per pen. Starting doses (2.5 mg) are generally less expensive than maximum doses (15 mg). Some providers offer loyalty discounts or bundled payment plans if you commit to longer treatment periods. It's worth comparing costs across different providers, but remember that the cheapest option isn't always the most reliable—ensure any provider is GPhC-registered and offers genuine UK prescriptions from qualified healthcare professionals. Private access bypasses NHS waiting lists entirely, meaning treatment can begin within days rather than months.
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.
NHS Wales vs Private Route: Which Is Right for You?
The NHS Wales route involves referral to a tier 3 specialist weight management service through your GP. You'll need a BMI of 30 or above (or 27+ with weight-related health conditions like type 2 diabetes or high blood pressure) to be eligible. Once referred, a multidisciplinary team will assess your suitability and manage your treatment, but waiting lists in some areas exceed 12 months. The private route requires an online consultation, takes days, and you manage ongoing prescriptions independently. Use our free BMI calculator above to check your starting point, and discuss both options with your GP—they can advise on current NHS Wales waiting times and help you decide which route suits your circumstances.
- 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.
What is the maximum NHS waiting time for Mounjaro in Wales?
Waiting times vary by health board. Some areas have waits of 6–12 months; others longer. Contact your local NHS Wales weight management service directly for current waiting times. Your GP can refer you and provide realistic timeframes for your area.
Can I get Mounjaro on the NHS in Wales if my BMI is 28?
Not typically. Standard NHS eligibility is BMI 30 or above, or BMI 27–29.9 with a weight-related health condition (type 2 diabetes, high blood pressure, sleep apnoea, or cardiovascular disease). Your GP can assess whether you meet the criteria.
How much does Mounjaro cost privately per month in the UK?
Private costs range from approximately £129 to £320 per month depending on your dose. The Mounjaro KwikPen is a one-month supply (four weekly injections). Compare providers for pricing, but always verify they're GPhC-registered with UK-licensed prescribers.
Do I need a GP referral to get a private Mounjaro prescription?
No. Private prescriptions require an online consultation with a licensed prescriber, not an NHS referral. However, it's still wise to inform your GP you're starting weight management treatment so they can monitor your progress and manage any interactions with other medications.
What's the difference between Mounjaro and Wegovy for NHS vs private access?
Both are available privately; both require NHS specialist referral for NHS access. Mounjaro is a dual GIP/GLP-1 agonist; Wegovy is GLP-1 only. Both have similar NHS eligibility criteria. Your prescriber will help determine which suits you better based on your medical history.
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.