Switch medication from vortioxetine to paroxetine.
- Day 1: reduce dosage of vortioxetine to 5 mg/day.
- Day 8: stop administration of vortioxetine.
- Day 8-14: a wash-out period of 1 week is necessary.
- Day 15: start administration of paroxetine in a normal dosage of 10-20 mg/day.  
- Occurrence of the serotonin syndrome is not likely, but theoretically possible, so caution is necessary.
- Paroxetine is a strong inhibitor of CYP2D6, which metabolizes vortioxetine.
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