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 Fat Loss Injections in the UK: Cost and Access
Mounjaro (tirzepatide) is a prescription-only weekly weight loss injection licensed in the UK for adults with obesity or overweight with weight-related health conditions. Access is available through both NHS specialist services and private online prescriptions, though costs and waiting times differ significantly between routes. This guide explains how to access Mounjaro in the UK, what it costs, and what the clinical assessment process involves.
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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 Cost and Access for Mounjaro in the UK
Private Mounjaro prescriptions through UK-licensed online services typically cost between £129 and £320 per month depending on your dose — with higher doses generally costing more. Each cost covers a month's supply (four pre-filled KwikPen injections). Most private providers offer consultation fees of £25–£50, which may be deducted from your first medication order. Access is straightforward: you complete an online health questionnaire, a UK-licensed prescriber reviews your information, and if approved, your prescription is sent to a GPhC-registered pharmacy for dispensing. Unlike the weekly weight loss injection journey on the NHS, private access typically takes 3–5 working days from consultation to delivery. Use our GLP-1 weight loss calculator to explore potential results at different doses before committing to treatment.
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 Routes: Which is Right for You?
NHS access to Mounjaro is free at point of use but requires referral to a tier 3 specialist weight management service through your GP — there is no direct NHS prescription option from primary care. The clinical assessment is thorough and personalised, though waiting lists vary dramatically by region, from a few months to over a year in some areas. Private prescriptions offer faster access without NHS referral, but you pay for the medication and ongoing costs. Both routes require a prescription and clinical assessment confirming BMI ≥30 (or ≥27 with weight-related health conditions). Your GP can advise on NHS availability in your area, and licensed online prescribers can assess private eligibility instantly. Many people find it helpful to calculate their current BMI and explore projected weight loss outcomes using our free BMI calculator and GLP-1 weight loss calculator before deciding which route suits them.
- 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 cost privately in the UK?
Private Mounjaro typically costs £129–£320 per month depending on dose, plus an initial consultation fee of £25–£50. Each month's supply includes four pre-filled KwikPen injections for weekly dosing. Costs increase with higher doses (5mg to 15mg). Most providers offer subscription or pay-per-month options.
Can I get Mounjaro free on the NHS in the UK?
Yes, Mounjaro is available free through NHS specialist weight management services (tier 3). You need referral from your GP and must meet eligibility criteria (BMI ≥30, or ≥27 with comorbidities). Waiting times vary significantly by region — some areas have short waits, others over a year.
How long does it take to get a private Mounjaro prescription?
Private prescriptions typically take 3–5 working days from your online consultation to delivery. This is much faster than NHS routes, which often involve referrals and waiting lists. Some providers may deliver within 1–2 working days depending on stock and your location.
What is the online consultation process for Mounjaro?
You complete a health questionnaire covering medical history, current medications, weight, height, and health conditions. A UK-licensed prescriber reviews your information within hours or days. If approved, your prescription is issued to a GPhC-registered pharmacy, which dispenses and delivers your KwikPens to your home.
Is Mounjaro available on the NHS in my area?
NHS availability varies by region and local ICB (Integrated Care Board) funding. Your GP can check whether your area offers Mounjaro through specialist services and refer you if eligible. Private options are available nationwide without NHS referral, though they involve out-of-pocket 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.