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
Why Is Mounjaro Increasing In Price in the UK?
Mounjaro (tirzepatide) prices have increased significantly in the UK since its launch, affecting both NHS and private patients. Several factors drive these cost increases, including global supply chain pressures, manufacturing and cold-chain storage requirements, MHRA regulatory status, and the high demand for weight loss treatments across the NHS. Understanding why these costs are rising helps you make informed decisions about weight management options. Use our free GLP-1 weight loss calculator to compare potential costs and outcomes across different treatment options available in the UK.
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.
Supply Chain, Manufacturing, and Market Factors
Manufacturing and storage costs are significant drivers of Mounjaro pricing. Each KwikPen must be manufactured to strict pharmaceutical standards, stored in temperature-controlled environments (2–8°C), and distributed through regulated cold chains. Unlike many oral medications, injectable medications carry substantially higher logistics costs. Global demand for Mounjaro has surged following positive SURMOUNT trial data and NICE approval for NHS use, putting pressure on Novo Nordisk's manufacturing capacity. Additionally, tirzepatide requires specialist pharmaceutical manufacturing processes. Currency fluctuations also affect UK pricing, as the drug is manufactured internationally. NHS procurement volumes have increased dramatically, but economies of scale have been offset by increased global competition for limited supply and the cost of maintaining strict pharmaceutical storage and safety standards. These pressures combine to push base prices higher across both NHS and private markets.
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.
NHS Funding, NICE Approval, and Market Context
Mounjaro received NICE approval for NHS use in 2024, making it available through tier 3 specialist weight management services. However, NHS funding for weight loss medications is limited, and price increases directly impact how many patients can be a UK pharmacy within fixed annual budgets. Integrated Care Boards (ICBs) must balance the cost of Mounjaro against other treatments like Wegovy and GLP-1 alternatives. Higher drug costs can mean smaller patient numbers accessing treatment through the NHS, longer waiting lists, or regional restrictions. Private pricing has also risen, reflecting manufacturing cost pressures and market demand. If you're considering Mounjaro through the NHS or private route, use our BMI calculator to check your eligibility, and speak to your GP about your tier 3 referral options or discuss costs with a licensed prescriber.
- 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.
Has Mounjaro become more expensive in the UK?
Yes. Mounjaro prices have increased since launch in 2023, driven by manufacturing costs, cold-chain logistics, global demand, and supply pressures. UK prices vary by dose and provider, ranging from approximately £150–£320 per month privately, with NHS costs set by NHS procurement contracts.
Why does Mounjaro cost more than Wegovy in the UK?
Mounjaro (tirzepatide) is a newer dual GIP/GLP-1 agonist with more complex manufacturing than Wegovy (semaglutide). Mounjaro's maximum dose of 15mg requires higher active pharmaceutical ingredient per pen, and global demand has outpaced supply, supporting higher pricing.
Will Mounjaro prices decrease in the UK?
Prices typically decrease when manufacturing capacity increases and patents expire. Currently, supply constraints and high demand support higher prices. Long-term, competition from new GLP-1 medications and increased manufacturing could reduce costs, but no timeline is confirmed.
Does the NHS pay full price for Mounjaro?
The NHS negotiates bulk pricing through procurement frameworks, paying less per dose than private patients. However, these contracted prices are confidential. Higher NHS costs still impact regional budgets, affecting patient access and waiting times.
Should I wait for Mounjaro prices to drop before starting treatment?
This is a personal decision best made with your GP. If you're eligible for NHS Mounjaro through tier 3 services, waiting may mean longer delays due to existing waiting lists. If considering private treatment, discuss cost concerns with a licensed prescriber about alternative options or payment plans.
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.