| to = fluoxetine
| stop =
* '''Before day 1:''' gradually reduce dosage of doxepin to a maximum of 100 mg/day.* '''Day 1:''' reduce dosage of doxepin to 50 mg/day.* '''Day 3:''' reduce dosage of doxepin to 25 mg/day.* '''Day 8:''' stop administration of doxepin.{{downDoxepin}}
| start =
* '''Day 89:''' start administration of fluoxetine in a normal dosage of 20 mg/day.
| info =
* {{theorSS}}
* Fluoxetine is a strong inhibitor of CYP2D6, which metabolizes doxepin. }}