* '''Before day 1:''' gradually reduce dosage of citalopram/escitalopram to a maximum of 40 mg/day, resp. 20 mg/day. * '''Day 1:''' reduce dosage of citalopram/escitalopram to 20 mg/day, resp. 10 mg/day.* '''Day 8:''' stop administration of citalopram/escitalopram.