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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7.5 mg Mounjaro Cost in the UK — Compared to Wegovy
The cost of Mounjaro at 7.5 mg varies depending on whether you access it through the NHS or private prescription in the UK. At this mid-range dose, Mounjaro (tirzepatide) is typically more expensive than Wegovy (semaglutide) when purchased privately, but NHS access depends on your local ICB and specialist tier 3 weight management services. Both are prescription-only medicines requiring a clinical assessment before being prescribed. Understanding the cost difference and how these medications work differently can help you make an informed decision with your GP.
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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.
Mounjaro vs Wegovy — Cost and Clinical Trial Data
At 7.5 mg Mounjaro, private prescription costs typically range from £160–£220 per month depending on the pharmacy and prescriber. The KwikPen contains four weekly injections (one month supply). Wegovy, in comparison, costs approximately £140–£180 per month at equivalent mid-range doses (around 1–1.7 mg), though individual pharmacy pricing varies.
The key clinical difference is mechanism: Mounjaro is a dual GIP and GLP-1 receptor agonist, whilst Wegovy is GLP-1-only. In the SURMOUNT-1 clinical trial, tirzepatide at 7.5 mg showed average weight loss of approximately 19.5% of body weight over 72 weeks when combined with lifestyle changes. Wegovy's STEP-1 trial showed approximately 14.9% average weight loss at its maximum 2.4 mg dose. Individual results vary significantly, and weight loss depends on dose titration, diet, and physical activity.
NHS access for both medications is through specialist tier 3 weight management services following GP referral. NHS availability and waiting times vary substantially by region. Mounjaro received NICE approval for NHS use but remains subject to additional MHRA monitoring (Black Triangle ▼ status).
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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.
Eligibility, Suitability, and Prescriber Assessment
Both Mounjaro and Wegovy UK prescription require the same eligibility criteria: BMI of 30 kg/m² or above, or 27–29.9 with weight-related health conditions (such as type 2 diabetes, hypertension, or sleep apnoea). For South Asian, Chinese, Black African, or Black Caribbean adults, lower BMI thresholds (from 27.5) may apply due to higher cardiovascular risk at the same BMI.
Whether you are offered 7.5 mg Mounjaro, Wegovy, or another option depends on individual prescriber assessment, your medical history, and response to lower doses. Mounjaro dose titration requires minimum 4 weeks at each dose level before escalation. Your prescriber will assess which medication—and which dose—is most suitable for you. Neither medication is "better" universally; suitability is individualised. Use our free GLP-1 weight loss calculator to explore potential outcomes at different doses alongside your clinical assessment.
- 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 7.5 mg more expensive than Wegovy?
Yes, privately Mounjaro at 7.5 mg typically costs £160–£220 monthly, whilst Wegovy at equivalent doses costs roughly £140–£180 monthly. However, prices vary by pharmacy and prescriber. NHS costs are the same for both if accessed through NHS specialist services, though both face significant regional availability variation.
What is the difference between Mounjaro and Wegovy mechanisms?
Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist, activating two natural hormone pathways. Wegovy (semaglutide) is GLP-1-only, activating one pathway. This dual mechanism may explain Mounjaro's slightly higher average weight loss in clinical trials, though individual results vary considerably.
Can I switch from Wegovy to Mounjaro at 7.5 mg?
Switching between medications requires your prescriber's assessment. There is no official NHS conversion chart, but approximately 1.7 mg Wegovy is considered roughly equivalent to 10 mg Mounjaro. Any switch must be managed clinically—never stop one and start another without medical guidance.
What are the main Mounjaro side effects at 7.5 mg?
Common side effects include nausea, diarrhoea, vomiting, constipation, and stomach pain. These typically occur during dose escalation and often improve with time. Serious side effects (severe stomach pain, gallbladder issues, allergic reactions) require immediate medical attention. Report all side effects to your prescriber.
How do I access Mounjaro at 7.5 mg through the NHS?
Access is through NHS specialist tier 3 weight management services following a GP referral. Your GP will assess whether you meet eligibility criteria and refer you if appropriate. NICE has approved tirzepatide for NHS use, but availability and waiting times vary significantly by region and local ICB commissioning.
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.