"have taken both nuvigil 250-375 and provigil 200-300 (1 to 1.5 tabs of each) they are wonderful for both memory and  attention (don&#039;t have hyperactive/impulsive criteria);  not amphetamines, i have stopped suddenly with no withdrawal whatsoever;  schedule 4 not 2--dont have to see dr every month. no side effects at all for me"