Metformin is a prescription medicine that lowers the glucose your liver makes and improves insulin sensitivity.
Why it matters for PCOS
Metformin was originally a type 2 diabetes drug. Because insulin resistance is common in PCOS, doctors sometimes prescribe metformin to help with blood-glucose control and, in some women, to improve cycle regularity and ovulation. It targets a metabolic driver rather than curing PCOS, so the effect varies from person to person.
Metformin is prescription-only and should be started and monitored by a doctor. Common side effects include nausea, diarrhoea, and bloating, especially early on, and long-term use can lower vitamin B12. Do not start or stop it on your own without medical advice.
This glossary is education, not diagnosis. For your own situation, ask a doctor or pharmacist.