Switching antidepressants
Why people switch antidepressants, how a switch is done, and what to expect.
Why people switch
There are a few usual reasons for a switch, and none of them is a failure.
The first medication may not have worked well enough, even at an adequate dose for an adequate length of time. Side effects may have been hard to tolerate. Or there may have been only a partial response, where some symptoms eased but not enough. Finding the right fit often takes a try or two, which is an ordinary part of treatment.
How a switch is done
A prescriber chooses among a few approaches, and the right one depends on the medications involved.
A direct switch means stopping one medication and starting the other. A cross-taper means gradually reducing the first medication while gradually starting the second. Sometimes one medication is tapered off fully before the other is started. Some combinations need a gap between the two, called a washout. This is true in particular for anything involving an MAOI antidepressant. Fluoxetine has a very long half-life, meaning it leaves the body slowly, and that affects the timing of a switch as well. The prescriber weighs these factors and picks the safest method.
What to expect during a switch
A switch can have a rough patch, and it helps to know what it looks like.
There can be a window where the old medication is wearing off and the new one hasn't fully taken effect. Discontinuation symptoms from the old medication are possible as it leaves the body. After that, the new medication needs its own four to six weeks to show its fuller effect. A prescriber plans the switch to keep that rough patch as small as possible, and it's worth telling them about anything that comes up along the way.
Why it's a normal step
Most people don't land on the perfect medication first.
Switching is an expected part of treatment, not a sign that treatment won't work. Each switch gives the prescriber useful information about what helps and what doesn't, which makes the next choice better informed.
Sources
This guide draws on current prescribing information and public health references. It is reviewed for clinical accuracy and updated as guidance changes.
- National Institute of Mental Health. Mental health medications.
- MedlinePlus, U.S. National Library of Medicine.
- American Psychiatric Association. Practice guideline for the treatment of patients with major depressive disorder.
Managing a medication needs a prescriber
Any psychiatric medication has to be started and adjusted by a clinician who can follow you over time. If you don't have a prescriber, our guides section explains the options, including in-person care and telepsychiatry, and how to choose between them.
This guide is for general education. It is not medical advice and is not a substitute for evaluation, diagnosis, or treatment by a qualified clinician. Never start, stop, or change a medication without talking to your prescriber. If you are in crisis or thinking about harming yourself, call or text 988 in the U.S. to reach the Suicide and Crisis Lifeline.