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
Mounjaro 12.5 Mg Cost in the UK
Mounjaro (tirzepatide) 12.5 mg is the second-highest dose available in the UK, typically reached after several weeks of dose titration. At this stage, the cost of Mounjaro depends on whether you access it privately or through the NHS. Private costs range from approximately £250–£320 per dose, whilst NHS access is through specialist weight management services, which varies by region. Understanding the full cost picture—and how it compares to Wegovy—helps you make an informed decision with your prescriber about which GLP-1 medication suits your circumstances.
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.
Mounjaro 12.5 Mg vs Wegovy: Cost and Clinical Differences
Cost comparison at equivalent doses:
- Mounjaro 12.5 mg (private): approximately £280–£320 per KwikPen (4 weeks)
- Wegovy 2.4 mg (private): approximately £250–£280 per pen (4 weeks)
- Both private options typically cost slightly more than lower doses due to supply and demand
In clinical trials, Mounjaro achieved greater average weight loss (approximately 20.9% body weight at 15 mg) compared to Wegovy (approximately 14.9% at 2.4 mg). However, individual results vary significantly. The 12.5 mg dose of Mounjaro falls mid-range in the titration schedule and may deliver meaningful results for many people, though some prescribers continue to escalate toward the 15 mg maximum. Wegovy reaches its maximum therapeutic dose at 2.4 mg—there is no further escalation.
Mounjaro uses a dual GIP and GLP-1 mechanism, whereas Wegovy uses GLP-1 only. This mechanistic difference is why some people may respond better to one than the other, a decision your prescriber will help guide based on your health profile.
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.
Eligibility, NHS Access, and What Affects Your Cost
Both Mounjaro and Wegovy require the same UK eligibility criteria: a BMI of 30 or above, or 27–29.9 with at least one weight-related health condition (type 2 diabetes, high blood pressure, cardiovascular disease, or obstructive sleep apnoea). Ethnicity-adjusted thresholds apply for South Asian, Chinese, Black African, and Black Caribbean adults.
NHS access: Both medications are available through NHS specialist tier 3/4 weight management services, but regional availability is limited and waiting lists can be lengthy. Private access: Cost varies by prescriber, online pharmacy, and your specific dose. The 12.5 mg Mounjaro KwikPen typically falls in the mid-to-higher cost bracket. Your prescriber will assess your suitability after a clinical consultation. Try our free GLP-1 weight loss calculator to estimate potential results at different doses to help inform your discussion.
- 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.
What is the typical cost of Mounjaro 12.5 mg per month in the UK?
Private Mounjaro 12.5 mg typically costs between £250–£320 per KwikPen (which contains 4 weeks of treatment). This is one of the mid-to-higher doses, so pricing reflects the later stage of dose titration. NHS cost is covered by the service if you access it through a specialist weight management service, but availability and waiting times vary significantly by region.
Is Mounjaro 12.5 mg more effective than Wegovy 2.4 mg?
Clinical trial data shows Mounjaro achieved average weight loss of approximately 20.9% at its maximum 15 mg dose, compared to Wegovy's 14.9% at 2.4 mg. However, at the 12.5 mg Mounjaro dose (not the maximum), results are typically 18–20%, and individual outcomes vary widely. Your prescriber will discuss which medication suits your health profile and expectations.
Can I switch from Wegovy to Mounjaro mid-treatment?
Yes, switching between medications is possible but must be managed by your prescriber. Approximate dose equivalences exist (Wegovy 2.4 mg ≈ Mounjaro 10–12.5 mg), but there is no official conversion chart. Your prescriber will advise on timing and any gaps in treatment. Discuss this fully with your clinical team before making any changes.
Does NHS cost more or less than private for Mounjaro 12.5 mg?
NHS access is free at the point of use if approved by your specialist weight management service, whereas private typically costs £250–£320 per KwikPen. However, NHS waiting lists can be 6–12+ months in many areas, and not all regions offer equal access. Private access is faster but comes with an upfront cost.
What factors affect the total cost of Mounjaro treatment?
Final cost depends on: (1) where you obtain it (NHS vs private), (2) your specific dose and how long you stay at 12.5 mg before escalating, (3) your prescriber or pharmacy's pricing structure, (4) whether you qualify for any NHS funding, and (5) how long you stay on treatment. Check with your prescriber about any bulk discounts or repeat prescription pricing. ```
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.