Meniere's is a tad bit different, because it has more to do with excessive endolymph produced by the stria, than structural damage.
For many Meniere's suffers their tinnitus and hearing loss/distortions fluctuate according to whether or not the stria is behaving normally. Over time though you can get damage to the hair cells if the swelling isn't controlled.
BUT, what's interesting is that there can be a strong viral component underlying Meniere's, which studies by Richard Gacek have demonstrated. So if you get the viral inflammation under control, you get the Meniere's under control. Thanks to
@FGG for tipping me off to this. He basically took a group of people who had been diagnosed with Meniere's - didn't even bother with subtyping - and said "hey, let's throw antivirals at you and see what happens."
A group of people 1-2 years out from diagnosis got actual positive audiogram changes on his regiment, which is actually kind of incredible. Some didn't, but again, Gacek wasn't really concerned with subtyping. Their problem might not have been viral, or the virus had already done too much structural damage.
Most importantly though, he was trying to show that the inner ear can be highly susceptible to viral infections, resulting in inflammation that can generate some pretty nasty hearing symptoms.
So if your tinnitus is generated by viral inflammation - or any inflammation outside of maybe autoimmune -then this could be seriously helpful. Tinnitus from other factors, or actual cochlear damage? Probably not so much.
If it's autoimmune you would have to treat the underlying cause or possibly be on this stuff for life, which honestly given the safety profile might not be a huge deal.