* '''Day 115:''' simultaneously start administration of amitriptyline in a low dosage of 25 mg/day. * '''Day 822:''' continue administration of amitriptyline in a dosage of 50 mg/day.
| info =
* “Start low, go slow” for amitriptyline, and caution with this switch is necessary.
* Venlafaxine is a weak inhibitor of CYP2D6, which metabolizes amitriptyline.}}