I took provigil over ten years ago and I couldn't tried again about two years ago and I can tolerate it BUT I had two break the tablet in half and just take it for about 2 weeks then went to a whole one. And yes I believe there is a difference between provigil and the generic the generic works but not as good. And the provigil was easier on stomach but insurance insist on generic now
I take both the 100mg and 200 mg and I have no side effects at all.