Carey, I've been taking Amantadine for 6 months now and like Ron I have a purple blotchy rash on my legs and arms. In my case it's not terribly noticeable and doesn't bother me much.
I also found with this drug it has a bit of an "upper" effect.
Initially I had trouble sleeping and more energy. Now it's settled down.
I don't have a tremor so I can't comment on its effectiveness for that but I had trouble with my gait and balance post DBS. Changes in settings to the neurostimulators didn't seem to help but once the amantadine kicked in my walking improved far more than I thought possible.
Good luck with it.
P.S. Anyone heard from Teresa? I miss her.