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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How to Access Mounjaro 2.5mg in the UK
Mounjaro 2.5mg is the starting dose of tirzepatide, a weekly weight loss injection licensed in the UK for adults with a BMI of 30 or above, or 27 and above with weight-related health conditions. Access comes through two routes: NHS specialist weight management services or private prescription through a UK-licensed prescriber. This guide explains your options, costs, and what the prescription process involves so you can make an informed decision about accessing this medication.
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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 2.5mg Cost in UK Private Practice
Private prescription costs vary by provider but typically range from £130–£180 per month for the 2.5mg starting dose. Each pre-filled KwikPen contains 4 weekly injections (one month supply). The cost includes the medication, the pen device, and usually a follow-up consultation. As you progress through dose titration — moving to 5mg, 7.5mg, and higher over several weeks — costs may increase slightly. Most private prescribers require an initial online consultation (typically £30–£50) to assess your eligibility, medical history, and suitability for this weekly weight loss injection. Subsequent monthly consultations are often included in the price or cost £20–£30 extra. Storage is straightforward: unopened pens stay refrigerated at 2–8°C until needed, then can be kept at room temperature for up to 30 days after first use.
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 vs Private Access & Online Consultation Process
NHS access is through tier 3 specialist weight management services — your GP refers you to a local NHS service, which then assesses your eligibility under NICE guidance. NHS waiting lists vary widely by region (some areas have months-long waits), and availability depends on your local integrated care board. Private access is faster: you book an online consultation with a UK-licensed prescriber, answer health questions, provide your height and weight (our free BMI calculator above can help confirm your status), and if approved, receive a prescription within 1–2 days. A GPhC-registered pharmacy then dispenses your medication. This route requires no NHS referral and is available immediately — though at a cost. Consider both routes based on your budget, timeline, and local NHS provision.
- 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.
Is Mounjaro 2.5mg available on the NHS in the UK?
Yes, NICE has approved tirzepatide (Mounjaro) for NHS use within specialist tier 3 weight management services. However, access is through referral from your GP and availability varies significantly by region. Many areas have waiting lists of several months. Your GP can check what's available in your area.
How much does Mounjaro 2.5mg cost privately per month?
Private costs typically range from £130–£180 per month for the 2.5mg starting dose, depending on the prescriber. This usually includes the KwikPen device, medication, and an online consultation. Costs may increase as you progress to higher doses during titration.
How long does a private online consultation take?
Initial consultations typically take 15–30 minutes. You'll answer questions about your medical history, current medications, and health conditions. The prescriber assesses whether Mounjaro is suitable for you. Follow-up consultations are usually quicker (10–15 minutes) and may be included in your monthly fee.
What's the difference between NHS and private access to Mounjaro?
NHS access requires a GP referral and has regional waiting lists but is free once approved. Private access is faster (1–2 days) and requires no NHS referral, but you pay out of pocket. Both routes require assessment by a licensed prescriber to confirm eligibility.
Do I need a prescription to get Mounjaro 2.5mg in the UK?
Yes, Mounjaro is prescription-only in the UK. You cannot buy it over the counter. Whether through NHS or private routes, a UK-licensed prescriber must assess you and issue a prescription before any pharmacy can dispense it.
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.