I don't see why antibiotics would interfere with LID. There's no iodine in them. To answer your question about endos or oncologists, I have heard some people see one or the other. I think the endos deal with the treatment for thyroid cancer much more frequently. . And they are the ones to get our synthroid dosages right and do the testing. I have seen both my endo and oncologist just to see if they are on the same page. They are and that's a comfort. I would say to do whatever you are comfortable with and who you have the best rapport with.