When I was in the third trimester of pregnancy last spring, I began asking about breastfeeding and my various medications. Thyroid was a no brainer, since it's just replacing what my body doesn't make itself. If I had needed insulin after delivery, that was no problem for the same reason. The big issue was taking metformin.

My Ob/Gyn said "Ask your Endocrinologist." My pharmacist said "OH NO, NOT metformin!" My endo said "No, you can't take metformin while breastfeeding." His Physician's Assistant later said "Sure, you can take metformin and nurse, but Dr. Endo isn't comfortable with our office telling you that officially; so do your own research and make up your own mind." (READ MORE)