narcolepsy
"I started taking Nuvigil after having taken Adderall Xr for 4 years. I like Nuvigil better because there is no feeling of artificial energy. The only thing that that Adderall has over Nuvigil is that it lasted all day. I've experimented a little and I've found that if I take 1/2 of the pill about 1 to 1 1/2 an hour before I get my day starts and the other half at about 1 gets me through the day better than taking it all at once. Also even with my insurance and the savings card I still have to pay $89. It's worth it though."