Ampyra
"For eight years now, I've been on 4-aminopyridine ER, the chemical name for dalfampridine, and am now on Ampyra.  I was able to obtain 4-AP from a compounding pharmacy by prescription.  I have been astounded by the change this chemical has made in me, and, through physical therapy and exercise, by what I have been able to gain because of it.  The primary improvement for me has been leg strength, but I've also noticed some improvement in breathing, eyesight, balance and cognition, though I find no documentation to support my observations on these latter four.  When I go off of the drug, these improvements vanish until I start up again.  I've gone from power chair to forearm crutches to hiking again!  Wow!!"