[Erowid Note: 280 mgs of Citalopram is considered an extremely high dose]
One night for the hell of it, I took a bunch of my anti-depressants (Celexa) because I was feeling very depressed and even suicidal at times. My psychiatrist prescribes me 40mg of Celexa twice a day. I took seven 40mg pills, 280mg of Celexa. This is where I messed up.
Not too long after I ingested the pills, I noticed lights getting brighter and my heart beating a little faster. Before I knew it, I felt like I was having a severe panic attack. Worse than any other ones I've ever had (I suffer from panic attacks and stress and take Klonopin for it). Objects started looking strange, I couldn't think straight (confusion, disorientation), and I felt like I was going to jump out of my skin. It was like abusing diphenhydramine at the 400mg - 600mg range. It was not a happy, fun, or exciting experience at all. It was terrible and I regret it even to this day.
I will never try this again and I extremely discourage anyone else from trying it. The pills are for depression, not for having a good ol' time. Take my word for it. Peace.