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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Wegovy Equivalent to Mounjaro 5mg: Cost and UK Access
If you're comparing Mounjaro 5mg to Wegovy, the approximate equivalent Wegovy dose is around 0.5mg — though individual results vary and the medications work differently. Both are prescription-only injections available in the UK through NHS specialist services or private online prescribing. Understanding the cost differences, access routes, and what each medication offers can help you discuss your options with a healthcare professional. Use our free GLP-1 weight loss calculator to explore potential outcomes with different treatment options.
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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.
Wegovy vs Mounjaro 5mg: UK Private Prescription Costs
Both Wegovy and Mounjaro are available privately in the UK through GPhC-registered online pharmacies following a clinical assessment with a licensed prescriber. Mounjaro 5mg typically costs between £150–£200 per month privately, whilst Wegovy 0.5mg (the approximate equivalent dose) generally costs £120–£180 monthly, though prices vary by provider and formulation.
The cost difference reflects both the medication itself and the prescriber consultation fee, which is usually included in the overall price. Neither medication is typically available on the NHS for routine weight management in most regions — access requires referral to specialist tier 3 weight management services, and waiting lists can extend many months. Private prescription offers faster access but requires upfront payment. When comparing Mounjaro vs Wegovy, cost is just one factor; your prescriber will assess which is more suitable based on your individual health profile, dose titration tolerance, and eligibility criteria.
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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 vs Private Access: How to Get Wegovy or Mounjaro in the UK
NHS route: Referral from your GP to a specialist weight management service (tier 3). Access is free but limited by regional ICB funding and waiting lists of months to years. Eligibility requires BMI ≥30 or BMI ≥27 with weight-related health conditions, plus attempts at lifestyle change. Not all regions offer both medications — availability varies.
Private route: Complete an online consultation with a UK-licensed prescriber, receive a prescription if clinically appropriate, and collect from a GPhC-registered pharmacy. Faster (usually within 48–72 hours), but costs apply. The prescriber will assess mounjaro uk prescription requirements and mounjaro dose titration suitability during consultation. Track your progress with our free progress tracker once you begin 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 Wegovy 0.5mg exactly equivalent to Mounjaro 5mg?
No — whilst 0.5mg Wegovy is the approximate clinical equivalent to 5mg Mounjaro, they are different medications with different mechanisms. Mounjaro is a dual GIP/GLP-1 agonist; Wegovy is GLP-1 only. Individual response varies, and a prescriber will recommend the most suitable option for your health profile, not just based on dose equivalence.
Which is cheaper — Wegovy or Mounjaro — in the UK?
Generally, Wegovy 0.5mg costs slightly less (£120–£180/month) than Mounjaro 5mg (£150–£200/month) privately. However, prices vary by provider and your exact dose. NHS costs are zero if eligible, but access is limited and waiting lists are long. Always check current prices with your chosen provider.
Can I get Wegovy or Mounjaro free on the NHS?
Possibly, if you meet your local ICB's eligibility criteria and secure referral to a specialist weight management service. However, availability is patchy — many regions have no NHS provision, and waiting lists are lengthy. Private prescription offers assured access but with costs. Your GP can advise on NHS options in your area.
What happens during an online consultation for Wegovy or Mounjaro?
A UK-licensed prescriber reviews your health history, current medications, BMI, and weight-related conditions. They'll assess whether you meet eligibility criteria (BMI ≥30 or ≥27 with comorbidities) and whether the medication is safe for you. If approved, a prescription is issued to a GPhC-registered pharmacy. The process typically takes 24–48 hours.
Do I need to have tried other diets before getting a prescription?
Most prescribers expect evidence of previous weight management attempts, including structured diet or lifestyle programmes. Private providers may have less stringent requirements than NHS services. Discuss your weight management history during your consultation — honesty about previous attempts is important for clinical assessment.
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.