Have you got a reference for that?
Aopa.org drug dB, but it is members only
http://www.aopa.org/members/database...?action=search...
"6 hour wait before flying"
Actually it seems that most of the "banned" drugs are those used to treat mental disorders such as depression, psychosis, seizure disorder, panic disorders, some pain relief and stuff like that. Makes sense really, if you have a condition that could really be a hazard to flying and are on medication for it then you can't fly.