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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Can Mounjaro Help with PCOS Weight Management in the UK?
Polycystic ovary syndrome (PCOS) often makes weight management challenging due to insulin resistance and hormonal imbalance. Mounjaro (tirzepatide) is a prescription-only injection that may help support weight loss in adults with PCOS who meet NHS eligibility criteria. This guide explains how Mounjaro works for PCOS, NHS access routes in the UK, and what the evidence shows. Use our free BMI calculator above to check your current BMI and understand your eligibility starting point.
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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.
How Mounjaro Works for PCOS and NHS Eligibility in the UK
Mounjaro is a dual GIP and GLP-1 receptor agonist — it activates two natural hormone pathways that regulate appetite, blood sugar control, and metabolism. For people with PCOS, this dual action may help address both weight management and insulin resistance.
PCOS is often classified as a weight-related health condition under NHS guidelines. This means adults with PCOS and a BMI of 27–29.9 may qualify for Mounjaro through NHS specialist services, as may those with a BMI of 30 or above. South Asian, Chinese, Black African, or Black Caribbean adults with PCOS may have lower BMI eligibility thresholds (from BMI 27.5 or above) due to higher metabolic risk in these populations.
NHS access requires: referral to a tier 3 specialist weight management service from your GP, clinical assessment, and ongoing specialist supervision. Availability varies significantly by region — waiting lists can be lengthy in some areas. Check your local Integrated Care Board (ICB) website for current services.
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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.
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PCOS, Insulin Resistance, and Weight Loss Evidence
PCOS affects approximately 1 in 10 women of reproductive age in the UK and causes insulin resistance in up to 70% of cases. Insulin resistance makes standard calorie restriction less effective, which is why medication that improves insulin sensitivity and appetite regulation can be particularly valuable.
Clinical trials of tirzepatide (Mounjaro's active ingredient) show average weight loss of 15–21% of body weight alongside reduced-calorie diet and increased physical activity — though individual results vary significantly. For people with PCOS, weight loss of even 5–10% can improve fertility, reduce androgen levels, and improve metabolic markers. Your GP or specialist can assess whether Mounjaro is appropriate for your PCOS and help set realistic expectations. Use our GLP-1 weight loss calculator to explore potential outcomes at different doses.
- 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.
Is Mounjaro licensed specifically for PCOS in the UK?
No. Mounjaro is licensed for weight management in adults with a BMI of 30 or above, or 27–29.9 with weight-related health conditions — PCOS qualifies as such a condition. However, it is not licensed exclusively for PCOS. Your GP or specialist assesses whether it is appropriate for your individual case.
How does Mounjaro help with PCOS specifically?
PCOS involves insulin resistance and hormonal imbalance. Mounjaro's dual GIP and GLP-1 action improves insulin sensitivity, reduces appetite, and supports more sustainable weight loss. Weight loss in PCOS can improve ovulation, reduce androgen levels, and improve metabolic health — though Mounjaro addresses weight management, not PCOS hormones directly.
Can I get Mounjaro for PCOS through the NHS?
Yes, if you meet eligibility criteria. You need a BMI of 27–29.9 with PCOS (a recognised weight-related condition) or BMI 30+. Your GP refers you to a tier 3 specialist weight management service. NHS availability varies by region — some areas have long waiting lists. Private prescribing is also available if you prefer faster access.
What dose of Mounjaro would I start on for PCOS?
All patients start on 2.5 mg Mounjaro once weekly, regardless of indication. Doses increase gradually every 4 weeks: 5 mg, 7.5 mg, 10 mg, 12.5 mg, then 15 mg maximum. Your prescriber adjusts based on your response and tolerance. Nausea and digestive side effects are common initially but often improve over time.
How long does it take to see weight loss results with Mounjaro in PCOS?
Most people notice appetite reduction within 1–2 weeks. Measurable weight loss typically becomes apparent after 4–8 weeks on therapeutic doses. Clinical trial data showed significant weight loss by 12 weeks. Results depend on dose, adherence, diet, activity, and individual metabolism — your specialist will monitor progress at regular intervals.
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.