was on both concerta and strattera. the former made me lean and mean, literally. it made me very cross, and why i don't know. i lost about 20 pounds on the stuff, that part of it was GREAT i could fit into my high school clothes again. but i had to switch to something else because i was just too damned angry about too many things too quickly. so mr. shrink put me on strattera, which calmed me down and straightened me out but gave me terrible GERD. i would wake up in the middle of the night choking on my own stomach acids, that also played havoc on my dental work. then my insurance stopped covering either med and since they both cost between $300 and $600 monthly, i had to drop them. my thinking since then has gotten disorganized, chaotic. i can sit down and write this, but just ask me to verbalize sensibly, and all that comes out is DUHHH.....
p.s., the 18mg daily dose is very small, if you have the emotional lability on this dose you might consider asking your doc about switching to another drug. strattera worked for me 'till the gut said no more. but it might not have quite that same effect on many other folk.