Lexapro (escitalopram oxalate) is the active isomer of Celexa (citalopram HBr); they've only been marketing it since December. It appears to have greater efficacy at lower doses with fewer side effects.
Anyway, this is what they prescribed me yesterday, along with a little cache of alprazolam (generic equivalent to Xanax) to be taken "as needed." Andrew Solomon says, "In my case, Xanax made the horror disappear as a magician makes a rabbit vanish." I would certainly like to be prepared the next time it shows up.