Cross-tapering Cross-tapering is switching antidepressants by lowering the first one while starting the second, so you take both for a while. It avoids a stretch without treatment and can soften withdrawal from the first, but taking two at once can raise side effects, including serotonin syndrome. It is never done when switching to or from an MAOI, which needs a gap instead.
Also called: Cross-taper, Overlap switch.
Written by Alena Kozlova, PhD , from published studies and prescribing information.
Definition medically reviewed by Dr. Jason Tan , Consultant Psychiatrist, on October 28, 2026, this definition only. Next review: October 28, 2027.
How do you cross-taper antidepressants? Your prescriber lowers the first medication over days or weeks while the second one starts at a low dose and goes up. Both changes go in steps, and how you feel after each step sets the pace. How long the overlap lasts depends on the two medications, including how fast the first one leaves the body, and on how you respond; the table below gives the half-lives of five common antidepressants. A 2016 review in Australian Prescriber stresses that any switch is done cautiously and under close watch, because some combinations can cause serotonin syndrome.
Half-life by antidepressant Half-lives of five common antidepressants, shortest first.
Half-lives of all antidepressants
When is a cross-taper used? Mostly when stopping the first medication at once could bring on withdrawal and the two medications can safely be taken together for a short time. It is not used with an MAOI, an older type of antidepressant: switching to or from one needs a washout instead, a gap with neither medication.
What people on Reddit say
Most people who said how they switched used a cross-taper. Of 1,185 people who described coming off an SSRI or SNRI on Reddit, 81 said they switched to another antidepressant. Of the 33 who said how, 25 lowered the old one while starting the new one; only a few switched straight away (4) or left a gap with neither (4). People who write about switching may not be typical, so this shows how it happens, not how often.
From public Reddit posts, counted by withClaro. These are self-reports, not a clinical study.
What does the overlap feel like? Withdrawal from the first medication and early side effects of the second can come at the same time, such as nausea, poor sleep, dizziness or feeling on edge, so it can be hard to tell which is which. Writing down each dose change and how you feel that day helps your prescriber sort them out. You may not feel the effect of the new medication for a few weeks, so it is too early to judge it in the first days.
What are the signs of serotonin syndrome during the overlap? Serotonin syndrome usually appears within hours of starting a medication or raising a dose. Mild signs include restlessness, sweating, shivering, diarrhea, a fast heartbeat and twitching muscles. High fever, rigid muscles, confusion or seizures need emergency care.
Is a cross-taper easier than a direct switch? Not always. A cross-taper lowers the first medication gradually, which can soften withdrawal, but you take two medications for days or weeks, which raises the risk of side effects such as serotonin syndrome. A direct switch is shorter and simpler, and suits some closely related medications. Which one fits depends on the two drugs and your dose.
What to do If several signs of serotonin syndrome build over the hours after a dose goes up during the overlap, call your prescriber the same day. For a high fever, rigid muscles, confusion or a seizure, get emergency care: in the US, call 911 or go to the nearest emergency room; elsewhere, call your local emergency number. Before the switch, ask your prescriber why they chose a cross-taper and how long the overlap will last, and note how you feel each day of it.
Read how switching antidepressants works
How withClaro helps Both medications and their doses on one timeline A daily check-in during the overlap, with notes ready for your next call Get the withClaro app on the App Store
Related terms Sources Keks N, Hope J, Keogh S. Switching and stopping antidepressants. Australian Prescriber, 2016. Mikkelsen N, Damkier P, Pedersen SA. Serotonin syndrome: a focused review. Basic & Clinical Pharmacology & Toxicology, 2023. National Institute for Health and Care Excellence (NICE). Depression in adults: treatment and management. NICE guideline [NG222]. NICE, 2022. Horowitz MA, Taylor D. The Maudsley Deprescribing Guidelines. Wiley, 2024. All glossary terms