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 for Weight Management in Endometriosis
Endometriosis is a chronic condition that can significantly impact weight management and overall health. If you have endometriosis and are struggling with excess weight, Mounjaro (tirzepatide) may be an option worth discussing with your GP. This guide explains how Mounjaro works, UK eligibility criteria, and how to access it through NHS specialist services or private prescription. Weight management can be particularly challenging with endometriosis due to inflammation, hormonal factors, and treatment side effects — understanding your options is an important first step.
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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 Mounjaro Works and Eligibility for Endometriosis Patients
Mounjaro is a prescription-only, once-weekly injectable medication that works as a dual GIP and GLP-1 receptor agonist. It may help regulate appetite, reduce food cravings, and support feeling fuller after smaller meals — effects that can be particularly valuable for people managing endometriosis-related weight challenges. Unlike some other medications, Mounjaro uses the KwikPen delivery system, making self-injection straightforward.
In the UK, you may be eligible for Mounjaro if you have a BMI of 30 kg/m² or above, or a BMI of 27–29.9 kg/m² with weight-related health conditions. Endometriosis itself is not specifically listed as a weight-related condition that qualifies you for Mounjaro, but if you have endometriosis alongside other conditions such as high blood pressure, type 2 diabetes, or cardiovascular disease, these may support your eligibility. A prescriber will assess your individual circumstances during a clinical consultation.
Use our free BMI calculator above to check whether you fall within the eligibility range, and our GLP-1 weight loss calculator to explore potential weight loss outcomes at different Mounjaro doses.
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.
Accessing Mounjaro in the UK: NHS vs Private Routes and Costs
NHS access: Mounjaro is approved by NICE for use within NHS specialist weight management services (tier 3/4). If your GP thinks you may benefit, they can refer you to your local specialist weight management service. However, NHS waiting lists vary significantly by region — some areas have waits of many months. Your GP will discuss whether you're suitable for NHS referral based on your health profile.
Private access: You can access Mounjaro privately through a UK-licensed online prescriber without an NHS referral. After an online consultation assessing your medical history and eligibility, a prescription may be issued and dispensed by a GPhC-registered pharmacy. Private Mounjaro costs typically range from £150–£300 per month depending on your dose. Starting doses (2.5 mg) are usually at the lower end of this range, with costs increasing as your dose is titrated upwards.
Track your progress with our free progress tracker once you start treatment.
- 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 if I have endometriosis?
Endometriosis alone doesn't automatically qualify you for NHS Mounjaro, but if you have endometriosis plus other weight-related conditions (like type 2 diabetes, high blood pressure, or cardiovascular disease) with a BMI of 27–29.9 or above, you may be eligible. Ask your GP about NHS specialist weight management services in your area.
What is the typical cost of Mounjaro in the UK privately?
Private Mounjaro costs range from approximately £150–£300 per month depending on your dose. Starting doses (2.5 mg) are usually cheaper; costs increase as your dose is titrated up to the maximum of 15 mg. Some providers offer dose packages or discounts for longer-term prescriptions.
How does Mounjaro compare to Wegovy for weight management?
Both Mounjaro (tirzepatide) and Wegovy (semaglutide) are prescription-only weight loss injections, but Mounjaro is a dual GIP and GLP-1 agonist while Wegovy is GLP-1 only. Clinical trials suggest Mounjaro may result in slightly higher average weight loss (15–21% body weight vs ~15% for Wegovy), but individual results vary. Your prescriber will assess which is more suitable for you.
What happens during a private online consultation for Mounjaro?
A UK-licensed prescriber will review your medical history, current medications, and weight management goals via an online questionnaire or video call. They'll assess your BMI, eligibility criteria, and any contraindications. If approved, a prescription is issued and sent to a GPhC-registered pharmacy for dispensing. The process typically takes 24–48 hours from consultation to delivery.
Will my endometriosis symptoms improve on Mounjaro?
Mounjaro is licensed specifically for weight management, not for treating endometriosis. However, if excess weight is contributing to your endometriosis symptoms or comorbidities (like high blood pressure), weight loss may provide some indirect benefit. Always discuss your endometriosis management separately with your GP or endometriosis specialist.
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.