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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Meal Plans For Mounjaro — UK Cost & Access
If you're considering Mounjaro (tirzepatide) for weight management in the UK, understanding the cost and how to access it is essential. Mounjaro works alongside dietary changes, and meal planning becomes important once you start treatment. This guide covers UK prescription costs, whether you can access Mounjaro through the NHS or privately, and what the process involves. We'll help you understand your options so you can make an informed decision about this prescription-only weight management injection.
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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 Cost and Access in the UK
NHS access: Mounjaro (tirzepatide) is approved by NICE for use within NHS specialist weight management services. However, NHS availability is limited and varies significantly by region. You'll typically need a GP referral to a tier 3 or tier 4 weight management service. Waiting lists can be lengthy — in some areas, months or even years. Once approved, the NHS covers the full cost of treatment.
Private access: Mounjaro is available through private online prescribing services following a consultation with a UK-licensed prescriber. The cost typically ranges from £180 to £320 per month, depending on your dose. A Mounjaro KwikPen (containing 4 weekly doses) costs between £150 and £280 privately, varying by provider and dose strength. Additional consultation fees (usually £30–£60) may apply.
- Starting dose (2.5 mg) is cheapest; doses increase to maximum 15 mg
- Private prescriptions require an online clinical assessment
- Payment is usually required upfront before dispensing
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 and What to Expect
Choosing your route: The NHS route is free but involves waiting and regional variation in availability. Private access is faster — typically 1–2 weeks from consultation to delivery — but requires upfront payment. Both routes require a clinical assessment to confirm you're eligible and that Mounjaro is safe for you.
The online consultation process: When accessing Mounjaro privately, you'll complete a health questionnaire covering your medical history, current medications, and weight-related conditions. A UK-licensed prescriber reviews this and decides if Mounjaro is appropriate. If approved, a prescription is issued to a GPhC-registered pharmacy. You'll inject once weekly, and your dose increases gradually over 16+ weeks. Use our GLP-1 weight loss calculator to estimate potential outcomes, and track your progress with our free progress tracker once you start.
- 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?
Mounjaro typically costs £180–£320 per month privately, depending on your dose. A single KwikPen (4 weekly injections) ranges from £150–£280. Consultation fees (usually £30–£60) may be charged separately. Prices vary between providers. The starting dose (2.5 mg) is cheaper than higher maintenance doses.
Can I get Mounjaro through the NHS?
Yes, Mounjaro is NICE-approved for NHS specialist weight management services. However, you must be referred by your GP to a tier 3 or tier 4 service. Availability and waiting times vary significantly by region. In many areas, waiting lists are very long. Once approved, the NHS covers the full cost.
How long does the private consultation take?
Online consultations typically take 15–30 minutes. You'll complete a health questionnaire beforehand. A prescriber reviews your information and responds within 1–5 working days. If approved, your prescription goes to a pharmacy immediately. First delivery usually arrives within 1–2 weeks of approval.
What if Mounjaro doesn't work for me or I get side effects?
If you experience side effects, speak to your prescriber immediately — they may adjust your dose or recommend stopping treatment. If Mounjaro isn't effective, discuss alternatives like Wegovy (semaglutide) with your prescriber. Do not stop injections abruptly; always seek guidance from the prescriber who's managing your treatment.
Do I need meal plans to use Mounjaro successfully?
Mounjaro works best alongside a reduced-calorie diet and increased physical activity. While structured meal plans aren't mandatory, eating a balanced, lower-calorie diet maximises results. Your appetite will naturally reduce on Mounjaro, making portion control easier. A GP or registered dietitian can provide personalised meal guidance if needed.
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.