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
When Does Mounjaro Price Increase in the UK?
Mounjaro (tirzepatide) pricing in the UK changes as you escalate through dose levels during your treatment. Unlike a fixed cost, Mounjaro follows a dose titration schedule where each KwikPen step — from 2.5 mg starting dose up to the 15 mg maximum — typically comes with different pricing. Understanding when Mounjaro costs increase and how this compares to alternatives like Wegovy helps you plan your treatment financially and make informed decisions about which 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.
How Mounjaro Dose Titration Affects UK Pricing
Mounjaro follows a mandatory dose titration schedule where you start at 2.5 mg and increase every 4 weeks if tolerated, progressing through 5 mg, 7.5 mg, 10 mg, 12.5 mg, and finally 15 mg. Each dose level typically carries a different cost — higher doses cost more per KwikPen because each pen contains a higher concentration of the active ingredient tirzepatide.
- Weeks 1–4: 2.5 mg starter dose — usually the lowest price point
- Weeks 5–8+: 5 mg maintenance dose — price increases noticeably here
- Weeks 9–12+: 7.5 mg escalation — further cost increase
- Weeks 13–16+: 10 mg escalation — continuing upward pricing
- Weeks 17–20+: 12.5 mg escalation — approaching maximum cost
- Week 21+: 15 mg maximum dose — highest price per pen
Most users remain on 5 mg, 10 mg, or 15 mg long-term. The price jump is typically most noticeable when moving from 5 mg to 10 mg and again at 15 mg.
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.
Mounjaro vs Wegovy: Pricing and Dose Differences
Mounjaro and Wegovy have different dose escalation schedules and pricing structures. Mounjaro starts at 2.5 mg and reaches maximum at 15 mg, whilst Wegovy begins at 0.25 mg and maxes at 2.4 mg. Because Mounjaro is a dual GIP and GLP-1 receptor agonist (versus Wegovy's GLP-1 only), the mechanisms are different, affecting how quickly you escalate and when costs peak. UK private pricing for Mounjaro typically ranges from £129–£320 per month depending on dose, whilst Wegovy costs range from approximately £129–£299 per month. Which medication suits you depends on your individual assessment with a prescriber — both require NHS NICE approval for NHS access or a prescription from a licensed UK prescriber for private use. Use our free GLP-1 weight loss calculator to explore potential outcomes with either medication.
- 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.
At what dose does Mounjaro pricing reach its peak in the UK?
Mounjaro reaches peak pricing at the 15 mg maximum dose. However, most patients stabilise at 5 mg, 10 mg, or 15 mg depending on individual tolerance and response. The price jump is often most significant between 5 mg and 10 mg, and again at 15 mg. Your prescriber will advise which dose is appropriate for you.
Does Mounjaro get cheaper if you stay on a lower dose?
Yes. If you stabilise on 5 mg or 10 mg rather than escalating to 15 mg, your ongoing monthly cost will be lower. Many patients find effective results at lower doses and choose to remain there. This is a discussion to have with your prescriber based on your individual response and health goals.
Is Mounjaro available on the NHS, and does pricing differ from private?
Mounjaro is available through NHS tier 3 specialist weight management services in some areas, but NHS availability and waiting lists vary significantly by region. Private prescriptions through UK-licensed online prescribers typically range from £129–£320 per month depending on dose. NHS access, where available, is free at point of use but may involve lengthy waits.
How does Wegovy pricing compare to Mounjaro at maintenance dose?
At maximum dose, Mounjaro (15 mg) typically costs slightly more than Wegovy (2.4 mg) in the UK, though both are in similar ranges. However, clinical trial data shows slightly higher average weight loss with Mounjaro in SURMOUNT trials compared to Wegovy in STEP trials. Individual suitability depends on your prescriber's assessment — both are prescription-only and require clinical evaluation.
Can I switch from Mounjaro to Wegovy to save money?
Switching between medications is a clinical decision, not a financial one. Your prescriber will assess whether a switch is appropriate based on your response, tolerability, and health profile. Any change requires a new clinical assessment. Do not stop or switch medications without medical guidance, as this can affect your weight management and health outcomes.
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.