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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5mg Mounjaro Weight Loss: Cost, Access & How to Get It in the UK
The 5mg dose is a key escalation step in Mounjaro treatment, typically used from weeks 5–8 as part of the dose titration schedule. If you're considering this weekly weight loss injection in the UK, understanding both cost and access routes — NHS specialist services or private prescription — is essential. This guide explains how to access Mounjaro, what you can expect to pay, and the differences between NHS and private pathways. We also cover what results the clinical evidence suggests at the 5mg dose level.
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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.
Private Prescription Cost & Private Access in the UK
In the UK, private prescription cost for Mounjaro 5mg typically ranges from £129 to £180 per month, depending on the provider and whether additional consultations are included. The 5mg dose represents the first full maintenance dose after the initial 2.5mg starter phase, making it a common point where patients assess affordability and effectiveness.
Private access route: You can obtain a 5mg Mounjaro prescription through a GPhC-registered online pharmacy following a remote clinical assessment with a UK-licensed prescriber. This assessment usually takes 15–30 minutes, covers your medical history, current medications, and weight management goals. If approved, a prescription is issued and your KwikPen is dispensed by post within 2–3 working days.
- No NHS referral needed — direct private access available
- Prescription valid for collection at any UK pharmacy if you prefer
- Additional costs may apply for follow-up consultations (typically £15–40)
- Most providers offer subscription options for regular doses
This private pathway means you avoid NHS waiting lists, which in some regions extend many months for specialist weight management services.
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: Eligibility, Timeline & What to Expect
NHS route: Mounjaro is available through NHS specialist tier 3 weight management services under NICE guidance, but access is limited by regional availability and waiting lists. Your GP can refer you to your local integrated care board (ICB) specialist service, though you may wait 6–12+ months depending on your region. Once under NHS care, the medication is provided free, but the path to 5mg takes minimum 8 weeks (4 weeks on 2.5mg starter, then 4 weeks on 5mg).
Private route timeline: You can start at any dose approved by your prescriber, often reaching 5mg within 4–8 weeks. This faster progression suits those who want quicker results or have already used GLP-1 medication before.
Use our GLP-1 weight loss calculator above to project estimated results at 5mg, and our BMI calculator to understand your baseline health metrics before starting.
- 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 a single 5mg Mounjaro KwikPen cost in the UK?
A single 5mg KwikPen (which contains 4 weekly doses) costs approximately £129–£180 through private prescribing services. NHS provision is free but requires referral to a specialist weight management service and varies significantly by region. Always check with individual providers for current pricing.
Can I get Mounjaro on the NHS in the UK?
Yes, Mounjaro (tirzepatide) is approved by NICE for NHS weight management services. However, access is through specialist tier 3 services only, typically via GP referral, and waiting lists can be lengthy depending on your region. Private prescription offers faster access but at personal cost.
What's the difference between the 5mg dose and other Mounjaro doses for weight loss?
The 5mg dose is the first full maintenance dose, used from weeks 5–8 as part of dose titration. Clinical trials show average weight loss of around 15% body weight at 5mg, with further loss often achieved at higher doses (10mg, 15mg). Individual results vary significantly based on diet, activity, and personal factors.
How long does it take to get a 5mg Mounjaro prescription privately in the UK?
Private prescription typically takes 2–5 working days from your online clinical assessment to receiving your KwikPen at home. The remote consultation itself usually takes 15–30 minutes. NHS access involves longer referral and waiting times, often several months depending on your local service.
Do I need a GP referral to access 5mg Mounjaro privately?
No. Private access requires only a clinical assessment with a UK-licensed prescriber through an online pharmacy — no GP referral needed. However, it's good practice to inform your GP that you're using weight loss medication, especially if you take other prescriptions, as Mounjaro may affect oral medication absorption.
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.