To this day, I'm at a complete loss with the US Medical Support System.
Here in Australia, I was on Tysabri for 13 years at a cost of US$1M, but here it cost me US$0.
I'm on Ocravus now at a cost of US$50K per year & again, it costs me US$0.
I'm truly at a loss for words; but the saving grace for you, you do have President Trump 'steering the ship'.
Ha ha

Of course, your reference to Dalfampridine is another name for Ampyra; I forgot.

I forgot to say, the 13 years of Tysabri cost me $0

I'm at a complete loss as to how you're treated?
It's abysmal.
I took part in a Drug Trial years ago for Ampyra, a Drug made by Biogen.
Anyway, it was proven to help with walking but was only affective on 30% of us.
For me, it did help & out of curtesy, Biogen have been supplying me the Drug free of charge for the last 10 years.
This would be at a cost of US$300 a month.
FYI, I finished 13 years of Tysabri last year after a cost of US$1M+

MS is sh*t enough without having the cost of Treatment being a monumental challenge.

Something is very, very wrong.