Antibiotics Causing Vision Issue?

E has started talking about headaches and fuzzy vision again. We looked back at the calendar and it seems like it started right after we started a precautionary antibiotic. (3x a week to help prevent a pneumonia chemo kids can get). 

She takes it Sunday, Monday and Tuesday each week. The trip to the ER for her fuzzy vision was the Wednesday after the first 3 day treatment. The side effects talk about severe headaches but not the vision.  Maybe the headache caused the vision? No one seems to really know. 

We are going to stop the antibiotic and see if that clears up the headaches and vision. I hope that is it. It would be nice to have an explanation, make it stop and move on.

A side note: she still loves dressing like a princess. Now we incorporate dramatic play. She is always the princess and whoever else plays the prince. She walks across the room and falls into the princes arms or bows. It is quite funny.