* Day 0: gradually Gradually reduce dosage of citalopram/escitalopram to a maximum of 20 mg/day resp. 10 mg/day, when this dosage is respectively > 20 mg/day and > 10 mg/day. * Day 1: Reduce When a dosage of citalopram/escitalopram to a maximum of 10 20 mg/day , resp. 5 10 mg/day, is reached, stop administration.

* Day 1: simultaneously start administration of nortriptyline No wash-out period is needed.* Start fluoxetine the next day in a normal dosage of 50 20 mg/day.* Day 8: stop administration of citalopram/escitalopram and continue administration of nortriptyline only. | info = * “Start low, go slow” for nortriptyline is not required, but caution is necessary.* The same applies to [[escitalopram]].