... w/20mg dextroamphetamine to take about 4PM.. It's not working/enough. I can't work/keep my school teaching job being this tired and am again on sick leave. How's Adderall, and any advice on dosages? I have no problem w/developing dependences, as previous extended trials w/drugs has shown. I'm 6'1", 175 lbs. This is my first (ever) online entry. I've been seeing a neurologist for 7 -8 yrs for this fatigue.