When my doctor realized 15 mg wasn't helping me they tried me on 20. I tried it and then immediatly said that isn't going to work. 20 mg made me what I'd describe as ADD. I couldn't focus on anything more than a minute or two. I wasn't necessarily nervous per say but I couldn't keep my head still or eyes still and it was like I was suffering severe paranoia just without the fear....... if that makes any sense.

I hope that helps some.