I have Modafinil prescribed for obstructive sleep apnea and narcolepsy. This drug is a life changer for me. I take one 200 mg tablet every morning, and I'm wide awake all day even while using Serostim. No foggy head, everything is clear, and no high or crash like you get with adderall. Great for concentration as well. RX Modafinil is far better than any of the generic stuff from overseas. They're not even close. Walgreens usually gives me the Modafinil made by Mylan, but this last script was the brand name Provigil made by Cephalon. They're equally effective, and work the same. No sides, it has no effect on appetite either.