Metformin: Is it Safe for Breastfeeding?

"Do I have to wean before I resume metformin?" is, perhaps, one of the most common questions posed by breastfeeding mothers suffering from PCOS. Fortunately, the answer to this question is a resounding "no," and that answer is supported by considerable research.

Benefits of Metformin
Metformin (a.k.a. glucophage), is an oral hypoglycemic drug used in the treatment of type II diabetes as well as polycystic ovarian syndrome and other diseases featuring insulin resistance. Though its exact action is uncertain, researchers believe that metformin functions by decreasing the intestinal absorption of glucose as well as increasing peripheral glucose uptake which may improve insulin sensitivity.

While not all women suffering from PCOS may test "insulin resistant," it is widely accepted that insulin resistance plays a key role in the syndrome. Metformin treatment is now becoming the most popular treatment for women suffering from the syndrome, as treatment often mitigates many of the syndrome's symptoms such as amennhorrea and anovulation. Cardiovascular health is also improved in women with PCOS who are treated with metformin.

Some women with PCOS may suffer from low milk supply, though it should be noted that the vast majority of mothers with PCOS exhibit adequate or even over supply. There is anecdotal evidence that metformin may increase milk production among women suffering from low supply directly related to the syndrome. However, the conditions contributing to an individual mother's milk supply can vary (scheduled feedings, early supplementation, poor latch etc.), and it should not be assumed that PCOS is the only, or even primary cause of low supply.

A young baby smiles at during feeding.

Credit: Carin Araujo

Copyright: Carin Araujo