Congrats on the baby!! How exciting!! I hope everything is going well.
I second everything mamaScarlett said. I was also told that Tobi is so poorly absorbed orally that it poses no risk in breastmilk. I did not use Tobramycin either nebbed or IV during pregnancy, but I have used it twice by IV while breastfeeding and did not pump and dump or make any changes to breastfeeding. I have used Cayston one month on, one month off since a couple months after she was born.
I have called Dr. Hale's Infant Risk Line at Texas Tech MANY times. I have the number programmed into my phone. I can't tell you how many times I was told by a nurse or doctor that I would need to pump and dump for 24 hours, only to be told by Dr. Hale that that is completely untrue. The big one was anesthesia. I had to have my port removed when my daughter was about 8 months old. I called the hotline and they told me that as soon I was alert enough to physically breastfeed her, it was safe to do so! I was shocked. They told me disregard whatever I would be told when I went in for the procedure. Sure enough, they told me at the hospital to pump and dump for 24 hours. I breastfed her just a few hours after surgery. I was told the same thing when having a dye study done on my port catheter. Doc said pump and dump for 24 hours, hotline said it posed no risk because it wasn't radioactive, so I didn't have to pump and dump at all.
Sorry for the super long winded reply. I just wanted to tell you all of this because I'm sure you'll be faced with similar dilemmas in the future, and the hotline is a GREAT resource. They are the experts and know WAY more about breastfeeding than general medical professionals. When I call they are always super friendly and often read me some of the studies that have been done and explain to me why it is safe which gives me peace of mind.
In case you're interested the number is 806-352-2519.
Good luck to you!! My daughter is 2 and even through all the meds and procedures we are STILL breastfeeding.
Take Care,
Autumn 33w/CF