Metformin Safety When Trying to Get Pregnant

Introduction to Metformin Safety

Metformin appears to be safe when trying to conceive, but there is no evidence-based need to continue it during pregnancy for women with polycystic ovary syndrome (PCOS) unless there are specific indications, as recommended by the American Diabetes Association 1, 2

For women with PCOS specifically, metformin can improve ovulation rates, which may benefit those trying to conceive, according to the American Academy of Family Physicians 3, 4

For women with PCOS who wish to conceive, treatment should begin with weight control and regular exercise, followed by medication if needed, as suggested by the American Academy of Family Physicians 3
Clomiphene citrate is recommended as first-line treatment for ovulation induction due to its effectiveness (about 80% ovulation rate), as stated by the American Academy of Family Physicians 3
Metformin improves insulin sensitivity and can be beneficial in improving ovulation frequency in women with PCOS, as reported by the American Academy of Family Physicians 3, 4

Randomized controlled trials comparing metformin with other therapies for ovulation induction in women with PCOS have not demonstrated benefit in preventing spontaneous abortion or gestational diabetes mellitus, according to the American Diabetes Association 2, 5
There is no evidence-based need to continue metformin in women with PCOS once pregnancy is achieved unless there are other indications, as recommended by the American Diabetes Association 2, 5
Metformin readily crosses the placenta, resulting in umbilical cord blood levels as high or higher than maternal levels, as reported by the American Diabetes Association 1, 6
Long-term follow-up studies of children exposed to metformin in utero have shown concerning trends, including higher BMI, weight-to-height ratios, and waist circumferences in children exposed to metformin during pregnancy, according to the American Diabetes Association 1, 6

For women with PCOS trying to conceive, metformin can be used to improve ovulation rates, particularly in those with insulin resistance, as suggested by the American Academy of Family Physicians 3, 4
Once pregnancy is achieved, there is generally no need to continue metformin unless there are specific indications such as type 2 diabetes, as recommended by the American Diabetes Association 2, 5
Discuss with your healthcare provider about discontinuing metformin once pregnancy is confirmed, as advised by the American Diabetes Association 1, 2

Metformin should not be used in women with hypertension, preeclampsia, or those at risk for intrauterine growth restriction due to potential for growth restriction or acidosis, as warned by the American Diabetes Association 2, 5
The effects of metformin on early pregnancy are not fully understood, and long-term offspring data continues to emerge, as reported by the American Diabetes Association 1, 6
Treatment failure with metformin monotherapy occurs in 14-46% of individuals, according to the American Diabetes Association 1