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 Weight Loss Treatment in Wales
Mounjaro (tirzepatide) is a prescription-only injectable medication for weight management that is available in Wales through both NHS specialist services and private prescribing routes. In the UK, NICE has approved tirzepatide for use within NHS tier 3 weight management services for eligible adults. Access varies significantly across Welsh health boards, and waiting times can be lengthy. Understanding your options — whether NHS or private — helps you make an informed decision about whether this dual GIP and GLP-1 receptor agonist treatment is right for you.
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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 Mounjaro Access in Wales: Eligibility & Services
In Wales, Mounjaro is available through NHS specialist tier 3 weight management services, which operate through your local health board. To access NHS treatment, you typically need a referral from your GP to your regional weight management centre.
- BMI eligibility: Mounjaro may be prescribed to adults with a BMI of 30 kg/m² or above, or BMI of 27–29.9 kg/m² with at least one weight-related health condition (type 2 diabetes, prediabetes, hypertension, dyslipidaemia, obstructive sleep apnoea, or cardiovascular disease history)
- South Asian, Chinese, Black African, or Black Caribbean heritage: Lower thresholds may apply — eligibility may begin at BMI 27.5 or above due to higher health risks at lower weights
- Dose titration: Treatment starts at 2.5 mg weekly and escalates incrementally (every 4 weeks minimum) up to a maximum of 15 mg once weekly, depending on tolerability and response
- NICE guidance: NICE has endorsed tirzepatide as clinically effective for weight management in the NHS, though regional variation in availability remains
Use our free BMI calculator above to check whether you may fall within eligible BMI ranges for your specific ethnicity.
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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.
Mounjaro Wales: NHS vs Private Routes
NHS route in Wales: Referral to your local health board tier 3 service, clinical assessment, then prescription if suitable. Significant waiting lists exist in many areas (sometimes 6–18 months). No medication cost to you, but limited availability of doses.
Private route: Online consultation with a UK-licensed prescriber, prescription issued if clinically appropriate, dispensed by a GPhC-registered pharmacy. Available without NHS waiting lists. Costs typically range from £150–£300+ monthly depending on dose. Try our GLP-1 weight loss calculator to estimate potential weight loss outcomes at different tirzepatide doses, helping you weigh up your options before deciding which route to explore.
- 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 difference between Mounjaro (tirzepatide) and Wegovy (semaglutide) for weight loss in Wales?
Both are prescription-only GLP-1 based medications available in Wales through NHS specialist services and private routes. Mounjaro is a dual GIP and GLP-1 receptor agonist with a maximum dose of 15 mg weekly; Wegovy is a GLP-1 agonist only with a maximum dose of 2.4 mg weekly. Clinical trials showed Mounjaro achieved average weight loss of 15–21% body weight, while Wegovy achieved approximately 15% — though individual results vary significantly and depend on adherence to lifestyle changes.
How long is the waiting list for Mounjaro on the NHS in Wales?
Waiting times for tier 3 weight management services in Wales vary by health board and current service capacity. Some areas have waits of 6–12 months or longer. Contact your GP or your local health board directly for current waiting times specific to your area, or ask about private prescribing options if NHS waiting lists are lengthy.
Can I switch between Mounjaro and Wegovy in Wales?
Switching between tirzepatide and semaglutide is possible but must be managed by your prescriber. Approximate dose equivalence exists (Mounjaro 10 mg ≈ Wegovy 1.7 mg), but switching requires clinical guidance. A prescriber will assess whether changing medication is appropriate for your specific situation and any side effects experienced on your current treatment.
What are the most common side effects of Mounjaro that Welsh patients should expect?
Very common side effects include nausea, diarrhoea, constipation, vomiting, and stomach pain — particularly during dose escalation. These typically improve over time as your body adjusts. Nausea affects more than 1 in 10 people initially. Always report persistent or severe side effects to your prescriber, particularly severe abdominal pain (which may indicate pancreatitis).
Do I need to stop other medications when starting Mounjaro in Wales?
Mounjaro may affect absorption of oral medications, particularly oral contraceptives — discuss all your current medications with your prescriber before starting. If you take diabetes medications (sulphonylureas or insulin), dose adjustments may be needed. Your GP or prescriber will review your full medication list and provide personalised guidance on any necessary changes.
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.