Started on 100 mg 2X daily, but that screwed up my sleep. Now on 100 mg once a day, still with some sleep issues.
The effect is different from Adderall, more subtle. With Adderall, I focused - on whatever was at hand. On Amantadine, I just seem to pick up things on my task list and do them. I'm not aware of focusing, but I start and finish things, pretty much because I feel a desire to do them.
On no meds, I can't even keep a task list.
On no meds, I 'hear' a pretty constant message saying, 'It's no use - you can't finish this, so why even start?' On 100 mg/day of Amantadine, I think I hear something like, 'No, no, you CAN do this. Might as well start it.' On 200 mg/day, I don't hear the negative message at all. The message is more like, 'Let me at this so I can finish it and feel good and do something that's even more fun.'
Still early days, though. I accept the sleep problem because when I'm awake in bed, it's as if it's 1985, but I don't know how long my tolerance or the effect will last. I don't even know if I'm acclimated to the drug yet.