| to = venlafaxine
| stop =
* '''Before day 0:''' gradually reduce dosage of trazodone to a maximum of 150 100 mg/day, when this dosage is > 150 mg/day. * '''Day 1:''' reduce dosage of trazodone to 75 mg/day.* '''Day 8:''' stop administration of trazodone.
| start =
* A wash-out period is not necessary.