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 7.5 Prices vs Wegovy: UK Costs and Comparison
Mounjaro 7.5 is a mid-range dose in the tirzepatide treatment plan, typically reached around weeks 9–12 of dose titration. If you're comparing Mounjaro 7.5 prices with Wegovy costs in the UK, it's important to understand that pricing varies significantly between private prescribers, and both medications require a clinical assessment before prescription. This guide breaks down the costs, mechanisms, and suitability of both options to help you make an informed decision with your prescriber.
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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 7.5 and Wegovy Work Differently
Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist, meaning it activates two hormone pathways. At the 7.5 mg dose, you're in the mid-escalation phase of treatment, typically prescribed during weeks 9–12 of your dose titration schedule. The dual mechanism may help regulate appetite and support feeling fuller after meals more effectively than GLP-1 alone.
Wegovy (semaglutide) is a GLP-1 receptor agonist only, activating a single hormone pathway. The maximum Wegovy dose is 2.4 mg weekly, reached around week 17 of titration. Clinical trial data (STEP-1) showed Wegovy helped participants lose approximately 14.9% of body weight on average. SURMOUNT-1 trial data showed Mounjaro at 10 mg and 15 mg doses achieved approximately 19.5% and clinically studied weight loss respectively—though individual results vary significantly, and results depend on diet and lifestyle changes alongside medication.
- Mounjaro: dual mechanism (GIP + GLP-1)
- Wegovy: single mechanism (GLP-1 only)
- Both require reduced-calorie diet and physical activity
- Both are prescription-only medicines requiring clinical assessment
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If your BMI suggests you're overweight or obese, explore our GLP-1 calculators to project potential weight loss on Mounjaro or Wegovy.
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UK Pricing, Eligibility, and Prescriber Choice
Mounjaro 7.5 prices in the UK through private prescribers typically range from £180–£250 per KwikPen (four-week supply), though this varies by provider. Wegovy costs are often similar but may differ depending on your dose stage and the prescriber. Both medications are available through NHS specialist weight management services (eligibility varies by region) or private online consultations following a clinical assessment with a UK-licensed prescriber. Your prescriber will assess which medication suits your health profile, medical history, and treatment goals—there is no universally "better" option. Use our free BMI calculator to check your starting point, and our GLP-1 weight loss calculator can help you understand projected outcomes at different doses for both medications.
- Private Mounjaro 7.5 cost: approximately £180–£250 per KwikPen
- Wegovy costs vary by dose and prescriber—typically £130–£250 monthly
- NHS access through specialist tier 3 weight management services (waiting lists vary by region)
- Prescriber assessment determines suitability for each individual
- 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 more expensive than Wegovy in the UK?
Pricing is similar between the two, typically £180–£250 per KwikPen for Mounjaro at mid-doses, and £130–£250 for Wegovy depending on dose stage and prescriber. Costs vary significantly between private providers, so it's worth comparing quotes from different GPhC-registered pharmacies before committing.
How do I know which injection is right for me—Mounjaro or Wegovy?
Your prescriber will assess your medical history, current health conditions, medications, and treatment goals during your clinical assessment. Both are prescription-only medicines requiring individualised evaluation. Neither medication is universally "better"—suitability depends on your specific health profile.
Can I switch from Wegovy to Mounjaro or vice versa?
Switching between medications is possible but must be managed by your prescriber. There is no official conversion chart—approximate equivalences exist (e.g. Mounjaro 10 mg roughly corresponds to Wegovy 1.7 mg), but any switch requires clinical guidance to ensure safe dosing and monitoring.
What is dose titration and why does Mounjaro 7.5 take weeks to reach?
Dose titration is a gradual escalation to minimize side effects. Mounjaro starts at 2.5 mg, then increases by 2.5 mg every 4 weeks until you reach an effective dose (typically 5–15 mg). The 7.5 mg dose is usually reached around weeks 9–12, allowing your body to adjust gradually.
Are Mounjaro and Wegovy available on the NHS in the UK?
Yes, both are available through NHS specialist tier 3 weight management services, though regional availability varies significantly and waiting lists can be lengthy. Private prescription through online clinical assessments is an alternative if NHS access is delayed or unavailable in your area.
Ready to take control of your weight loss journey?
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