No side effects, I'm a bit tired, but I think it's mainly due to a living change, and a lack of sleep. I.e. went from a 1 bedroom with a window with great airflow/AC, to a townhome /loft type where there's not really AC/airflow. I got back from the doctor a couple hours ago and since there's such great improvement, but could be slightly better, I either wanted to bump up the dosage of Celexa OR get on Xanax 1 mg twice a day. Since I've experienced HUGE improvements on Celexa ( 20 mg a day), it was easy to do 40 mg a day which I'll start tomorrow. I'll still be able to take 1 mg of xanax when needed. This truly has made a HUGE difference so far.. and this Friday it'll be 6 weeks.