I had no significant side effects from
Provigil except that when it wore off
in the afternoon I would feel a kind of odd, hard-edged tension or something for awhile.
Ritalin (a low dose--I took 10 mg twice a day) is great for concentration, motivation, cheerful mood, and faster typing! :) I had no side effects whatsoever.
I now take Strattera and it works perfectly for the fog. It's not for fatigue, though.
Nancy T.