Narcolepsy
"I was given Provigil for my narcolepsy, with dosage of 200mg/3 times daily.  For the first 3 days it was amazing I had forgotten what it felt like to be &#039;awake&#039;. Unfortunately, after just 3 days it was not effective at all.  My neurologist nodded knowingly when I told him.  He said that&#039;s how long it takes to metabolize.  Apparently that&#039;s when you can tell if it will work for you or not.  I&#039;m now on Aderall, 20 mg/3 daily and it is working much better for me."