* '''Day 1:''' stop administration abruptly.

* Start '''Day 2:''' start escitalopram the next day in half the dosage of citalopram.

* Defined Daily Dose citalopram: 20 mg* Defined Daily Dose es-citalopram: 10 mg* The enantiomers of the racemic mixture citalopram and es-citalopram have qualitatively a quite similar pharmacological effect., therefore the switch is generally not advised