narcolepsy
"Taken Ritalin over 15 yrs for NARCOLEPSY.   Provigal to $$.  Over the years I have increased to 40mg two times daily.  Have not (and won't) increased dosage in over 5 yrs.  Retired now so it's easier to adjust mg.  If I feel it's not working,  I will stop taking it for a week or two (if possible) and then go back 10 mg at a time.   May be time consuming but never had addiction.   Considering the SR."