I'm odd man out on this one. I've been prescribed provigil since 2013 but went overseas generic when my insurance changed a couple times. I would get headaches nearly every time taking the overseas generics at the same dose(100mg) and less than that did not have as good an effect. I've gone USA brand to overseas a couple of different times. Always had the same experience, unfortunately
It's been since about 2018 since switching back to USA generic