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: NHS Eligibility and UK Information
PCOS (polycystic ovary syndrome) makes weight management particularly challenging due to insulin resistance and hormonal factors. Mounjaro, the prescription-only tirzepatide injection, has shown promise for weight loss in PCOS patients because its dual GIP and GLP-1 mechanism may help regulate both appetite and blood sugar control. This guide explains NHS eligibility, how Mounjaro works with PCOS, and your options for accessing it in the UK. Always consult your GP or specialist before starting any weight loss treatment.
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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 How Mounjaro May Help With PCOS
PCOS patients with a BMI of 30 kg/m² or above, or BMI 27–29.9 with weight-related health conditions, may be eligible for prescription weight loss treatment through NHS specialist tier 3 weight management services. PCOS itself qualifies as a relevant health condition due to increased metabolic risk. Mounjaro (tirzepatide) works by activating two natural hormone pathways—GIP and GLP-1—which may help regulate appetite, reduce cravings, and improve insulin sensitivity. In clinical trials, participants using Mounjaro at the highest dose (15 mg weekly) lost an average of approximately 21% of their body weight over 72 weeks, though individual results vary significantly and depend on lifestyle changes including reduced-calorie diet and increased physical activity.
For PCOS patients specifically, weight loss of even 5–10% can improve hormone balance, restore menstrual regularity, and reduce insulin resistance markers. Your UK prescriber or NHS specialist will assess whether Mounjaro is suitable based on your personal health profile, other medications, and medical history.
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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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Accessing Mounjaro for PCOS: NHS vs Private Routes
In the UK, you can access Mounjaro through two routes: NHS specialist services or private online prescribing. NHS access: Referral from your GP to a tier 3 weight management service. NICE has approved tirzepatide for specialist use, but availability varies by region and waiting lists can be substantial. Private access: Online consultation with a UK-licensed prescriber through a GPhC-registered pharmacy, typically available within days. Either route requires clinical assessment to confirm eligibility. Once prescribed, Mounjaro comes as a pre-filled KwikPen device injected once weekly. Storage requires refrigeration at 2–8°C before use, then room temperature for up to 30 days after opening. Using the MyWeightCheck GLP-1 weight loss calculator can help you understand potential projected 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.
Can I get Mounjaro on the NHS for PCOS?
Potentially, yes. PCOS qualifies as a relevant condition for weight management treatment. You'll need referral to a tier 3 NHS specialist weight management service from your GP. NICE has approved tirzepatide, but availability and waiting times vary significantly by region. Specialist assessment determines final eligibility based on your BMI and individual health.
How does Mounjaro help PCOS weight loss specifically?
Mounjaro's dual GIP and GLP-1 action may improve insulin sensitivity—a key issue in PCOS—and regulate appetite hormones. Clinical evidence shows tirzepatide may support approximately 15–clinically studied weight loss on average. Even 5–clinically studied weight loss can improve PCOS symptoms including hormone balance and menstrual regularity, alongside reduced-calorie diet and exercise.
How long does Mounjaro take to work for PCOS?
Weight loss typically begins within 4–8 weeks, though individual timelines vary. Doses increase gradually every 4 weeks from 2.5 mg to a maximum of 15 mg weekly. Most people reach effective doses by week 12–20. PCOS hormonal improvements may take 3–6 months of consistent use combined with lifestyle changes.
What are the most common Mounjaro side effects for PCOS patients?
Very common side effects include nausea, constipation, diarrhoea, and stomach pain—generally mild and temporary. These often improve as your body adjusts. Less common: headache, fatigue, hair loss, or acid reflux. Serious side effects are rare but include severe stomach pain (possible pancreatitis). Report any concerning symptoms to your prescriber immediately.
Can I use Mounjaro alongside PCOS medications like metformin?
Potentially yes, but requires prescriber oversight. Metformin and Mounjaro work through different mechanisms and are often used together. However, GLP-1 medicines may slow stomach emptying, potentially affecting metformin absorption timing. Your prescriber will adjust medication schedules if needed. Always disclose all current medications during clinical assessment.
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.