My dexamethasone treatments were administered via injections right into my eardrums.
I went to Korea twice for a stem cell/growth factor treatment for my hearing loss and tinnitus and both times I experienced acoustic traumas.
The first time it was from a parade of protestors making a big fuss about dog and cat meat slaughter and the leader of the protest pointed his megaphone right at me and shouted the chant.
The next day at the clinic I told the doctor about it and he immediately gave me a shot of dexamethasone and my spike subsided by the next day.
The second one was when I was there the second time about 3 months later (after yet another acoustic trauma caused by a loud smootch on my ear that didn't subside on its own) and I was busy on my computer doing work and foolishly sat next to a very loud laundry machine for about 40 minutes and the spin cycle was horrendously loud but I was so caught up in my work that I didn't pay any attention to it and my ear facing it was ringing loudly immediately afterwards.
The next day I told the doctor about this and he gave me some dexamethasone for a few days.
It's hard to tell whether that, or the other part of my treatments were responsible for where I am now but I am very happy with my improvements. The doctor that operated on me seemed to really know what he was doing and referred to dexamethasone as a "magic drug".
He also told me that he had used periodic dexamethasone injections to treat his Meniere's patients, and this claim is backed up by this study:
https://www.sciencedirect.com/science/article/pii/S2090074016300068
"Intratympanic
dexamethasone for Meniere's disease is very satisfactory if medical treatment fails."