I've been on 4-aminopyridine for the past three years due to my MS which I have had for 9 years. I have been taking 4AP for 3 years and have it filled from a compounding pharmacy by prescription. I am about to switch to Ampyra. I’ve have been nervous about changing, because I feel the 4AP has been great for me. To those that have received Ampyra, do you see any benefits beyond or less than 4AP? 4AP has been instrumental in helping me walk longer and with more strength, do you feel that way now? If you took 4AP, do you still use it on other days?