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 Dose: Cost and Access in the UK
Mounjaro (tirzepatide) is available in the UK through both NHS specialist services and private prescription routes, with costs varying significantly depending on which path you choose. If you're considering this GLP-1 receptor agonist weight loss injection, understanding the pricing structure, dose options, and eligibility requirements is essential before starting treatment. This guide covers what Mounjaro costs, how NHS access works, and how to access private prescriptions legally through UK-licensed prescribers.
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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 Privately in the UK?
Private Mounjaro prescriptions in the UK typically cost between £150 and £350 per month, depending on the dose and pharmacy. A single KwikPen device contains four doses (four weeks' supply), so costs are usually quoted per month rather than per injection.
- Lower doses (2.5–5 mg) generally cost £150–£200 per month
- Mid-range doses (7.5–10 mg) cost approximately £200–£270 per month
- Higher doses (12.5–15 mg) cost £280–£350+ per month
Prices vary between GPhC-registered online pharmacies, and some offer loyalty discounts or subscription options that reduce monthly costs. The weekly weight loss injection is administered at home using the pre-filled KwikPen device. Always compare pricing across registered providers, as significant savings are possible by shopping around.
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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: How to Access Mounjaro in the UK
NHS access is through specialist tier 3 or tier 4 weight management services — not standard GP prescription. Your GP must refer you to your local Integrated Care Board (ICB) weight management service. Waiting times vary widely by region, from months to over a year in many areas. Once approved, Mounjaro is provided free, but availability depends on local commissioning decisions.
Private access bypasses NHS waiting lists. You complete an online consultation with a UK-licensed prescriber, who assesses your eligibility based on your BMI, health history, and current medications. If approved, a prescription is issued to a GPhC-registered pharmacy for dispensing. This route is faster — typically days rather than months — but you pay the full cost. Use our GLP-1 weight loss calculator to explore potential outcomes at different Mounjaro doses before committing.
The online consultation process is straightforward: answer medical history questions, declare any medications or allergies, and confirm your height and weight. The prescriber reviews your information and decides within 24–48 hours. If approved, your prescription goes directly to the pharmacy, which ships the KwikPen to your UK address. Important: only use GPhC-registered pharmacies — unlicensed or overseas suppliers pose serious safety and legal risks. Mounjaro requires dose titration, so you'll start at 2.5 mg and increase weekly or fortnightly depending on tolerability, meaning your first month costs less than subsequent months.
- 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.
Can I get Mounjaro on the NHS for weight loss?
Yes, but through specialist services only. Your GP refers you to your local tier 3 weight management service. Eligibility requires a BMI of 30+ or 27+ with weight-related health conditions. Availability varies by region and waiting times can exceed 12 months. Once approved, it's free, but supply depends on local ICB commissioning.
What's the cheapest way to get Mounjaro in the UK?
NHS provision is free once approved, but waiting times are long. Privately, prices range £150–£350/month depending on dose. Compare GPhC-registered pharmacies for discounts. Starting at the lowest dose (2.5 mg) also reduces initial costs, though you'll titrate upwards over weeks.
How many pens do I need per month?
One KwikPen per month, as each pen contains four once-weekly doses. At dose titration (weeks 1–4), you use one 2.5 mg pen, then progress to higher doses in subsequent weeks, requiring new pens as you advance through the titration schedule.
Is Mounjaro the same as tirzepatide?
Yes. Mounjaro is the brand name for tirzepatide, a dual GIP and GLP-1 receptor agonist injection. Tirzepatide is the active ingredient. When prescribed, you'll receive Mounjaro pre-filled KwikPens, the UK-licensed formulation for weight management.
What happens if I can't afford private Mounjaro?
If private costs are unaffordable, ask your GP about NHS referral to your local weight management service—costs are free once approved. Alternatively, some services offer payment plans, though this varies. Your GP may discuss other weight loss options depending on your circumstances.
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.