I've tried the 0.2mg Clen and they are pretty good. Not like 10 spiropent or anything but maybe 7-8, think they all are pretty "underdosed"..maybe 0.15mg or so. When I'm on these IP clen I feel tired as hell. When the effect goes away, I really pas out, I always do 1 caffein 3 times oer day to hold myself awake..