I would definately check this one out with your doctor. I'm on TOBI and Tobra IV's regularly and I know one of the side effects is hearing loss. I had a scare with this last week, I started getting ringing in my ears and pain-so they had to alter my meds.
I asked my cf doc, and asked a second opinion also to my ENT specialist if TOBI (inhaled) can cause any hearing damage-and they both agreed yes it can. They said it's more common in IV tobra, but this does happen with TOBI too. It surpised me.
This may be a reach-and I'm not saying anything for sure-but I'm wondering if inhaling TOBI so far up into your sinuses, which is closer to the ear canal and ear nerve endings-would be even more of a risk to hearing. So please be careful! After my scare last week-I realized even more how precious our hearing is and I don't want myself or anyone else to lose it.