"This is the best medicine that I have taken for my condition. I took it for years because of Narcolepsy mainly but have a shortened attention span also. Never had a problem with it. Never needed to increase the 10mg dosage per day. With my doctor retiring and new doctors obsessed with Provigil I&#039;ve had nothing but problems in all directions. From my prescription plan not wanting to pay for the 800 mg per day that I need to take to the performance of the medicine. I also have to take 36 mg of Concerta. "