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 vs Wegovy Prices in September — UK Comparison
Both Mounjaro (tirzepatide) and Wegovy (semaglutide) are available in the UK as prescription-only weight loss injections, but their prices differ significantly depending on dose and provider. In September 2024, Mounjaro and Wegovy prices vary between NHS specialist services and private online prescribing routes. This guide compares costs, eligibility, and how each medication works to help you understand your options. Both require a clinical assessment from a UK-licensed prescriber before prescription.
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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.
How Mounjaro and Wegovy Work — Key Mechanism Differences
Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist, meaning it activates two natural hormone pathways simultaneously. This dual mechanism may help regulate appetite and support feeling fuller after meals more effectively than single-pathway medications. Wegovy (semaglutide) is a GLP-1 receptor agonist only, activating one hormone pathway.
In clinical trials, Mounjaro showed an average weight loss of approximately 20.9% of body weight at the maximum 15 mg dose (SURMOUNT-1 trial), whilst Wegovy showed approximately clinically studied weight loss at its maximum 2.4 mg dose (STEP-1 trial). However, individual results vary significantly, and both medications are used alongside a reduced-calorie diet and increased physical activity. Neither medication is a standalone weight loss solution.
The choice between them depends on individual suitability, assessed by your prescriber during a clinical consultation.
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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.
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Mounjaro and Wegovy Pricing in the UK — September 2024
Private prescribing prices (approximate September 2024):
- Mounjaro: £129–£250+ per month depending on dose (higher doses = higher cost)
- Wegovy: £140–£220+ per month depending on dose
Prices vary between private online prescribing providers. Most require a one-time clinical consultation fee (typically £40–£90) before initial prescription.
NHS access: Mounjaro and Wegovy are available through NHS specialist weight management services (tier 3) following referral from your GP. Availability and waiting times vary significantly by region. Calculate your potential savings and eligibility using our free GLP-1 weight loss calculator to estimate costs at your starting dose.
- 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 Mounjaro cheaper than Wegovy in the UK?
Prices are comparable, typically ranging £129–£250 for Mounjaro and £140–£220 for Wegovy monthly. Exact costs depend on dose, provider, and whether you're accessing privately or through the NHS. Mounjaro's higher doses may cost more than Wegovy's maximum dose.
Can I get Mounjaro or Wegovy free on the NHS in September 2024?
Both are available on the NHS through specialist tier 3 weight management services, but access varies by region and requires a GP referral. Many areas have long waiting lists. Private prescribing is faster but incurs a cost, typically £40–£90 for consultation plus monthly medication fees.
Which GLP-1 injection is better — Mounjaro or Wegovy?
Both are effective prescription medications. Clinical trials showed Mounjaro may support slightly higher average weight loss, but individual results vary. Your prescriber will assess which is more suitable for your health profile, medical history, and eligibility during your clinical consultation.
What is the starting dose price for Mounjaro in September?
Mounjaro starts at 2.5 mg weekly, typically costing £129–£160 per month privately. The dose increases every 4 weeks to a maximum of 15 mg. Check with your prescriber or provider for exact current pricing, as costs can vary.
Do I need a UK prescription for Mounjaro or Wegovy?
Yes, both are prescription-only medicines in the UK. You need a prescription from a UK-licensed prescriber following a clinical assessment confirming your eligibility based on BMI and health conditions. Private online prescribers can issue prescriptions if you meet eligibility criteria.
Ready to take control of your weight loss journey?
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