Like Perna I've only taken it for 3-5 days for asthma but I noticed a tendency to become quite, I guess I'd say manic on it. Almost like I was taking speed.

I race around doing 50 million things and not finishing any of them and speaking at a million miles an hour.

Also noticed myself to be quite jittery and agitated. I think that had a lot to do with pent up energy though.