Switching from Fluoxetine to Vortioxetine

Introduction to Switching Strategy

The American Academy of Child and Adolescent Psychiatry recommends waiting at least 5-7 days before initiating vortioxetine after discontinuing fluoxetine to minimize the risk of serotonin syndrome and drug interactions 2
The American Family Physician suggests that fluoxetine's long half-life provides a built-in taper effect, making abrupt stoppage without tapering a viable option 1

The American Family Physician notes that fluoxetine's extended half-life means withdrawal symptoms are less likely to manifest, but monitoring for SSRI discontinuation syndrome is still necessary 1
The Journal of the American Academy of Child and Adolescent Psychiatry advises monitoring for serotonin syndrome, characterized by mental status changes, neuromuscular hyperactivity, and autonomic instability, especially when combining serotonergic agents 2
The Annals of Internal Medicine recommends evaluating treatment response 4-6 weeks after initiating vortioxetine and monitoring for improvement in depressive symptoms and cognitive function 5
The Lancet Psychiatry suggests assessing treatment response at 4-6 weeks after initiating vortioxetine at a therapeutic dose 6

The American Academy of Child and Adolescent Psychiatry warns against cross-tapering fluoxetine with vortioxetine due to increased risk of serotonin syndrome and unpredictable vortioxetine levels 2
The American Family Physician recommends temporarily reinstating fluoxetine at a lower dose if withdrawal symptoms are intolerable during the washout period, then tapering more gradually over 10-14 days before attempting the switch again 1
The Annals of Internal Medicine advises considering alternative strategies if there is an inadequate response after 6-8 weeks at the maximum tolerated dose of vortioxetine 5
The Annals of Internal Medicine also recommends allowing 21 days after stopping vortioxetine before starting an MAOI, and avoiding combining vortioxetine with other serotonergic drugs without careful monitoring 5, 7
The Pediatrics journal suggests contacting patients within 1-2 weeks of discontinuation to assess for withdrawal symptoms 4