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
What's the Price Difference Between Mounjaro and Wegovy in the UK?
Both Mounjaro (tirzepatide) and Wegovy (semaglutide) are prescription-only weight loss injections available in the UK, but their costs vary significantly depending on whether you access them through the NHS or privately. The price difference between Mounjaro and Wegovy depends on your dose, the provider, and your route to treatment. Understanding the cost of each option helps you make an informed decision about which medication might suit your budget and health needs. This guide breaks down the typical prices you'll encounter in the UK.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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.
UK Private Prescription Costs for Mounjaro and Wegovy
Mounjaro (tirzepatide) typically costs between £140 and £320 per month on private prescription in the UK, depending on your dose. Starting doses like 2.5 mg and 5 mg are generally cheaper, while higher maintenance doses (10 mg, 15 mg) cost more. Each Mounjaro KwikPen contains four weekly injections, so you receive one pen per month.
Wegovy (semaglutide) usually costs between £130 and £280 per month privately, also varying by dose. Starting doses (0.25 mg, 0.5 mg) are less expensive than higher doses (1.7 mg, 2.4 mg). Like Mounjaro, one Wegovy pen supplies four weekly injections.
- Starting doses of both medications are significantly cheaper than maximum doses
- Private prices vary between GPhC-registered online prescribing services
- Some providers offer package discounts for multiple months
- Consultation fees (typically £20–£50) may be separate from medication costs
Individual pricing varies, so it's worth comparing options from different UK prescribers.
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 Access vs Private: Which Route is Right for You?
NHS access is free at the point of prescription if you're eligible and referred to a specialist tier 3 weight management service. However, availability is extremely limited in many UK regions, and waiting lists can stretch months or years. Mounjaro and Wegovy are approved by NICE for NHS specialist services, but not all areas have them in stock, and some ICBs (integrated care boards) restrict access to specific patient groups.
Private access is faster and more widely available — you can arrange a prescription within days through an online consultation with a UK-licensed prescriber. You pay for the consultation (usually £20–£50) and the medication directly. Private treatment offers more choice in doses and providers, but costs add up over months of use.
Use our free GLP-1 weight loss calculator to help you understand potential long-term medication costs and projected weight loss outcomes when comparing your options.
- 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.
Why is Mounjaro sometimes more expensive than Wegovy per dose?
Prices vary by provider and dose, not medication type. Mounjaro has a wider dose range (2.5 mg to 15 mg) compared to Wegovy (0.25 mg to 2.4 mg), which can affect overall monthly cost. Higher Mounjaro doses may cost more, but lower starting doses can be cheaper than equivalent Wegovy doses. Shop around between UK prescribers for the best price.
Can I get Mounjaro or Wegovy free on the NHS in the UK?
Yes, both medications are NHS-approved for weight management in specialist tier 3 services. However, availability is very limited and varies by region. Most people are currently accessing these medications privately because NHS waiting lists are long. Ask your GP for a referral to see if your local specialist weight management service has them available.
What's included in the private prescription cost?
The cost usually covers the medication only. Consultation fees (£20–£50) are often charged separately. Delivery is typically included. Some providers bundle multiple months' supply at a discount. Always check what's included before paying — some services offer all-inclusive pricing while others have separate charges for consultations and prescriptions.
How much will Mounjaro or Wegovy cost over a year?
For Mounjaro, expect approximately £1,680 to £3,840 per year depending on your dose; Wegovy typically costs £1,560 to £3,360 annually. These are rough estimates based on average private prescription prices — actual costs vary between providers. Use our GLP-1 weight loss calculator to estimate your own potential costs across different doses.
Is there a cheaper alternative to Mounjaro and Wegovy in the UK?
Saxenda (liraglutide) is another NHS-approved GLP-1 medication for weight management, often cheaper than Mounjaro or Wegovy because it's been available longer. However, Saxenda is a daily injection rather than weekly. NHS lifestyle support and tier 1 weight management programmes are also free. Your GP can discuss all options suited to your situation.
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.