Delighted with the delivery! Took one 15mg pill at 10:30 and after 15mins was already feeling the onset with an elevated heart rate. I cleaned my apartment (frantically), noticed that I'm very detail oriented. Just to see if 7.5mg would do anything I took half a pill at about 5pm, if did work well for me, studied and got really into it. I recommend this for anyone who needs motivation and focus at a task at hand, it works wonders. Onset quick, duration very long.