| 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.{{downNortriptyline}}
| start = 
* '''Day 1:''' simultaneously start administration of citalopram in a normal dosage of 20 mg/day.
| info = 
* Citalopram is a very weak inhibitor of CYP2D6, which metabolizes nortriptyline.  
{[review}}
}}