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 Weight Loss Pills: Cost and Access in the UK
Mounjaro (tirzepatide) is a prescription-only weekly weight loss injection now available in the UK through both NHS specialist services and private prescription routes. If you're considering this medication, understanding the cost, eligibility, and access pathways is essential. This guide explains how to access Mounjaro in the UK, what it costs, and what to expect during the prescription process.
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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.
How Much Does Mounjaro Cost in the UK?
Private prescription costs for Mounjaro in the UK typically range from £129 to £320 per month, depending on your dose and the provider. Each KwikPen device contains four weekly injections, so costs are usually quoted per month or per dose level.
- Lower doses (2.5–5 mg): Around £129–£180 per month
- Mid-range doses (7.5–10 mg): Around £180–£240 per month
- Higher doses (12.5–15 mg): Around £240–£320 per month
Private prescriptions require an online clinical assessment with a UK-licensed prescriber. NHS access is free at the point of use but availability is limited and varies significantly by region. Many areas have long waiting lists for specialist weight management services.
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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 Routes to Mounjaro
The NHS route involves referral to a tier 3 or tier 4 specialist weight management service by your GP. NICE has approved tirzepatide for use within these services, but access depends on your local Integrated Care Board (ICB) and regional availability. Waiting times can range from several months to over a year in some areas.
The private route is faster. You complete an online consultation with a UK-licensed prescriber, who assesses your eligibility based on BMI and health status. If approved, a prescription is issued and dispensed by a GPhC-registered pharmacy. This typically takes days rather than months. Use our free GLP-1 weight loss calculator to explore potential outcomes, and the BMI calculator to check your starting point.
- 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 available on the NHS in the UK?
Yes, Mounjaro (tirzepatide) is available through NHS specialist weight management services following NICE approval. However, availability is limited and varies by region. Access requires GP referral to a tier 3 or tier 4 service. Many areas have significant waiting lists. Private prescription is an alternative if NHS waiting times are prohibitive.
What does a private Mounjaro prescription cost per month?
Private costs typically range from £129 to £320 per month depending on your dose. Starting doses (2.5–5 mg) are usually cheaper; higher maintenance doses (12.5–15 mg) cost more. Prices vary between providers. Each month's supply covers four weekly injections via a KwikPen device.
How do I get a private prescription for Mounjaro in the UK?
Complete an online consultation with a UK-licensed prescriber through a registered service. You'll answer health questions and may have a video call. If approved based on BMI and health status, a prescription is issued and sent to a GPhC-registered pharmacy for dispensing. The process typically takes 2–5 days.
Do I need a GP referral for a private Mounjaro prescription?
No. Private prescriptions do not require NHS referral. You access a private prescriber directly online. However, informing your GP that you're using Mounjaro is recommended so they can monitor your progress and adjust any other medications if needed.
What happens after I'm prescribed Mounjaro — how do I take it?
You receive KwikPen devices in the post. You self-inject once weekly, rotating injection sites between stomach, thigh, and upper arm. Starting dose is 2.5 mg; this is increased every 4 weeks until you reach an effective maintenance dose (typically 10–15 mg). Your prescriber provides guidance on dose titration and what to expect.
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.