Is Metformin Safe During Pregnancy?
Metformin is increasingly used in pregnancy for PCOS and gestational diabetes, but insulin remains preferred.
Last reviewed: April 2026
Safety Summary
Metformin is increasingly used in pregnancy for PCOS and gestational diabetes, but insulin remains preferred.
Category C — Use Cautiously
Animal studies show adverse effects; weigh benefits vs. risks.
Trimester-by-Trimester Guide
1st Trimester (Weeks 1–12)
Sometimes continued for PCOS. Discuss with doctor.
2nd Trimester (Weeks 13–26)
Insulin is preferred for gestational diabetes. Metformin is second-line.
3rd Trimester (Weeks 27–40)
May be continued if needed. Insulin usually preferred.
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Safer Alternatives During Pregnancy
Your doctor may suggest one of these alternatives. Always confirm with your obstetrician.
Frequently Asked Questions
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Ask GoDavaii AIMedical Disclaimer: Pregnancy safety information is based on available clinical data and FDA classifications. This page is for educational purposes only and does not substitute professional medical advice. Every pregnancy is different — consult your doctor or gynaecologist before taking any medicine. Drug safety classifications may have been updated; always verify current guidelines.