Modafinil is reported by fewer people than amphetamines to be helpful for ADHD symptoms.

“my clinical experience with it it tends to be again with the amphetamine on top many fewer people describe it as being helpful or as as helpful um on the other hand there's one study and I'm forgetting the principal investigators it was at Brown University where they used some very clever sophisticated approach to try to sort out motivation versus pure cognitive functioning and their claim and and it was a very well done study they were comparing it directly to an amphetamine product their claim was that modafanil was the one that was actually boosting cognitive functions and not just boosting motivation”