| to = citalopram
| stop =
* '''Before day 1:''' gradually reduce dosage of nortriptyline to a maximum of 100 mg/day.* '''Day 1:''' reduce dosage of nortriptyline to 50 mg/day.* '''Day 3:''' reduce dosage of nortriptyline to 25 mg/day.* '''Day 8:''' stop administration of nortriptyline.{{TCAdecrease25p3d}}| start = * '''Day 1:''' simultaneously start administration of citalopram in a normal dosage of 20 mg/day.{{StartAntidepressant}}| info = * Citalopram is a very weak inhibitor of CYP2D6, which metabolizes nortriptyline. {[review}}Safe target dose citalopram = 20 mg
}}
