Celexa is one of the only anti-depressants that works for me; I am 19 years old and female. I reacted badly to Lexapro. The strange side-effect I experience with celexa is I lose track of my thoughts when speaking, and experience the "tip-of-the-tongue" sensation, forgeting words and such. I switched to lexapro because of this, but I ended up switching back to celexa. has anyone else experienced this odd side effect?