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 PCOS Weight Management — NHS and UK Context
PCOS (polycystic ovary syndrome) often involves weight gain and difficulty losing weight, making weight management an important part of treatment. Mounjaro (tirzepatide), a prescription-only dual GIP and GLP-1 receptor agonist, may help support weight loss in PCOS patients in the UK. This guide explains NHS eligibility criteria, how the tirzepatide mechanism works for PCOS specifically, and the difference between accessing Mounjaro through NHS tier 3 services versus private routes. Understanding your options helps you and your GP make an informed decision.
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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.
NHS Eligibility and PCOS Weight Management
In the UK, Mounjaro (tirzepatide) is prescribed for adults with PCOS who meet specific BMI thresholds. You may be eligible if you have a BMI of 30 kg/m² or above, or a BMI of 27–29.9 kg/m² with at least one weight-related health condition. PCOS itself counts as a relevant condition because it is associated with insulin resistance, metabolic dysfunction, and increased cardiovascular risk. For people of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS applies lower BMI thresholds (starting at BMI 27.5 or above) because these groups face higher metabolic and cardiovascular risk.
Access through NHS tier 3 specialist weight management services requires referral from your GP. Your prescriber will assess your individual health profile, current medications (including PCOS treatments like metformin), and whether tirzepatide is appropriate for you. Dose titration follows a standard schedule: starting at 2.5 mg once weekly and increasing by 2.5 mg every 4 weeks, up to a maximum of 15 mg weekly. Clinical trials showed that on average, participants lost approximately 15–21% of their body weight alongside a reduced-calorie diet and increased physical activity, though individual results vary significantly.
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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 Access Routes for Mounjaro
NHS access to Mounjaro for PCOS is limited and varies significantly by region. Many integrated care boards (ICBs) have specialist weight management services (tier 3/4), but waiting lists can be very long — in some areas, waits exceed 12 months. Private access is available through GPhC-registered online pharmacies following an online clinical assessment with a UK-licensed prescriber. You do not need an NHS referral for private prescribing. Costs typically range from £129–£320 per month depending on your dose and provider. Whether you choose NHS or private routes, Mounjaro is always a prescription-only medicine requiring clinical assessment. Track your weight loss progress using our free progress tracker, and use our GLP-1 weight loss calculator to estimate potential outcomes at different doses based on your starting weight.
- 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 take Mounjaro with other PCOS medications like metformin?
Mounjaro may be used alongside metformin. However, tirzepatide can slow stomach emptying and reduce absorption of some oral medications, including oral contraceptives. Inform your prescriber of all medications you take so they can assess any interactions. You may need to adjust timing of doses.
Does Mounjaro help with PCOS symptoms other than weight?
Mounjaro is specifically licensed for weight management. Some PCOS patients report improvements in cycle regularity and hormone levels as a secondary benefit of weight loss, but this is not the primary mechanism. Your GP or endocrinologist can discuss whether weight loss may help your individual PCOS symptoms.
What is the difference between Mounjaro and Wegovy for PCOS?
Both are weight loss injections available in the UK, but Mounjaro (tirzepatide) is a dual GIP and GLP-1 agonist, while Wegovy (semaglutide) is a GLP-1 agonist only. Clinical trials suggest tirzepatide may produce slightly greater average weight loss, but both require prescription and clinical assessment. Your prescriber will recommend what is most suitable for your health profile.
Is Mounjaro available on the NHS for PCOS specifically?
Mounjaro is available through NHS tier 3 specialist weight management services if you meet BMI and health condition criteria. PCOS qualifies as a weight-related health condition, but NHS provision is limited and regional availability varies. Your GP can refer you to your local specialist service.
What side effects should I expect with Mounjaro for PCOS?
Common side effects include nausea, diarrhoea, constipation, and reduced appetite — particularly when starting or increasing your dose. Most improve over time. Serious side effects are rare but can include pancreatitis or gallbladder problems. Discuss any concerns with your prescriber; they can adjust your dose if side effects are significant.
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.