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
How Much Does Mounjaro 2.5mg Cost in the UK?
Mounjaro 2.5mg is the starting dose of tirzepatide, a prescription-only weight management injection licensed in the UK. The cost varies significantly depending on whether you access it through the NHS or privately. There is no single "cheapest" option — it depends on your eligibility, region, and how you obtain your prescription. Understanding the different routes available can help you make an informed decision about your weight management options.
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.
NHS Access vs Private Cost for Mounjaro 2.5mg
NHS access to Mounjaro: If prescribed through the NHS, you pay the standard prescription charge (currently £9.90 in England for a three-month supply, or free if eligible). However, NHS access is extremely limited. Mounjaro is available only through specialist tier 3 weight management services, and availability varies significantly by region. Most ICBs (Integrated Care Boards) have long waiting lists or limited stock. You must be referred by your GP and meet NICE eligibility criteria: BMI of 30 or above, or 27–29.9 with weight-related health conditions such as type 2 diabetes, high blood pressure, or sleep apnoea.
- NHS cost: £9.90 per prescription (England) if eligible
- Access: Through specialist weight management services only
- Waiting time: Months to years in many regions
- Requires GP referral and clinical assessment
Private access: Private online prescribers charge for both the clinical consultation and the medication itself. Mounjaro 2.5mg typically costs between £130–£180 per month from private pharmacies, depending on the provider and whether you need multiple pens. This covers the prescription, clinical assessment, and dispensing.
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.
Why Does Price Vary, and Which Route Is Affordable?
The 2.5mg dose is the starting dose — most people increase to higher doses (5mg, 7.5mg, 10mg, 15mg) within weeks. If cost is your primary concern, the NHS route is technically cheapest at £9.90 per prescription, but access is severely limited and waiting times are substantial in most areas. The private route offers faster access and certainty, though at higher upfront cost. Some private providers offer subscription or multi-dose packages that reduce per-dose costs slightly. Before starting any weight loss medication, use our free BMI calculator to check your eligibility status, and discuss NHS referral options with your GP — even if waiting times are long, it may be worth being added to a list whilst exploring other options.
- 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 NHS prescription charge for Mounjaro in 2024?
In England, the standard prescription charge is £9.90 per item. If you're exempt (under 18, over 60, on certain benefits, pregnant), it's free. Scotland, Wales, and Northern Ireland have different systems. Check your local prescribing pathway with your GP.
Can I get Mounjaro for less through the NHS?
If you're eligible, NHS prescription costs are fixed at £9.90 (England). However, NHS availability is extremely limited — most areas have long waiting lists. Your GP can refer you to tier 3 services, but access varies by region.
How much does Mounjaro 2.5mg cost privately in the UK?
Private Mounjaro typically costs £130–£180 per month for a single KwikPen (one dose). Costs vary by provider. Some offer package discounts for multiple pens. Always check the full price including consultation fees before committing.
Is Mounjaro 2.5mg the dose most people stay on?
No. The 2.5mg dose is the starting dose for the first 4 weeks only. Most people increase to 5mg in weeks 5–8, then potentially higher doses. Costs increase with dose escalation — factor this into long-term budgeting.
What's the difference between Mounjaro and Wegovy in terms of cost?
Both are prescription-only. NHS costs are similar if available. Privately, Mounjaro and Wegovy (semaglutide) typically cost similar amounts per month. Mounjaro's starting dose is higher (2.5mg vs 0.25mg for Wegovy), so actual injection cost may differ slightly by provider.
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.