Is there any science out there to support it? Gabapentin is also supposed to be a miracle cure but it only works (anecdotally) for very few people and the studies are inconclusive.
It (memantine) is not a full cure, and I never advertised it as such. It only anecdotally lowers the severity of tinnitus which can make the difference between a person wanting to stop living versus continue living. Also, it is strictly for short term use only, a few weeks (3) to a few months (3), and no more, but its benefit can last.