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 2.5mg Cost and Access in the UK
The cost of Mounjaro 2.5mg varies significantly depending on whether you access it through the NHS or privately in the UK. The 2.5mg dose is the starting dose used during the first four weeks of treatment, and pricing depends on your route to prescription. This guide explains what you can expect to pay, how to access Mounjaro through both NHS and private channels, and what factors affect the overall cost of your weekly weight loss injection.
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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.
Private Mounjaro 2.5mg Pricing in the UK
Private prescription costs for Mounjaro 2.5mg in the UK typically range from £120 to £180 per injection, though prices vary between GPhC-registered online prescribing services. Each KwikPen contains four doses (four weeks of treatment), so your initial supply cost depends on the pharmacy and the specific dose strength.
- Mounjaro 2.5mg is the starting dose — used for weeks 1–4 only
- Most people progress to 5mg after four weeks, which may cost more
- Private prescriptions require an online clinical assessment with a UK-licensed prescriber
- Assessment fees (typically £15–£40) are usually separate from medication costs
- Prices may include follow-up consultations or be charged separately
It's worth comparing costs across different providers, as pricing and package deals vary. Some services offer subscription or repeat prescription discounts for longer-term treatment.
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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 vs Private Access Routes
NHS route: Access to Mounjaro on the NHS is through specialist tier 3/tier 4 weight management services following a GP referral. However, availability is extremely limited and varies by region (ICB). Many areas have waiting lists of 12–24 months or longer, and not all ICBs have approved tirzepatide for routine use. This is the only free route if you meet eligibility criteria, but access is not assured.
Private route: Faster access with no waiting lists. You'll complete an online consultation with a licensed prescriber, who assesses your medical history and suitability. If approved, your prescription is dispensed by a GPhC-registered pharmacy. This typically takes 3–7 days from initial consultation to delivery. Most people choose the private route due to NHS waiting times.
What to expect in a private online consultation: You'll answer detailed health questions about your weight, medical history, medications, and weight management goals. The prescriber reviews your information and decides if Mounjaro is appropriate for you. You'll receive guidance on injection technique, storage, and what side effects to expect. Some services offer nurse support or follow-up reviews included in the cost; others charge separately. Always confirm what's included before purchasing.
- 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.
How much does Mounjaro 2.5mg cost privately in the UK?
Private Mounjaro 2.5mg typically costs £120–£180 per injection from UK online prescribing services. Each KwikPen contains four doses, so a four-week supply costs roughly £480–£720. Assessment fees (£15–£40) are usually separate. Prices vary between providers, so compare before purchasing.
Can I get Mounjaro 2.5mg free on the NHS?
Mounjaro is approved by NICE for NHS use, but access is through specialist weight management services only, not standard GP prescription. You'll need a GP referral and assessment by a tier 3 or 4 service. Availability varies by region, and waiting lists are often 12–24 months or longer. NHS access is extremely limited.
Is the 2.5mg dose the only price I need to pay?
No. The 2.5mg is your starting dose for weeks 1–4 only. Most people increase to 5mg in weeks 5–8, which costs more. Your total cost depends on your final maintenance dose and how long you continue treatment. Use our free weight loss calculator to explore projected treatment durations and costs.
What's included in the private consultation cost?
That varies by provider. Some include the initial consultation, prescription, and one follow-up review. Others charge separately for assessments, follow-ups, or nurse support. Always check what's included before purchasing. Some services offer ongoing support or dose escalation guidance at no extra cost; others charge for each interaction.
How quickly can I get Mounjaro 2.5mg if I go private?
Most private services deliver Mounjaro within 3–7 days of your approved consultation. NHS access is much slower — waiting lists average 12–24 months depending on your region. If you need faster access to this weekly weight loss injection, private prescription is significantly quicker, though it does involve upfront costs.
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.