Published
Medically reviewed by Danesh Alam MD, DFAPA, DFASAM
Brain zaps are brief, electric shock-like sensations in the head that some people feel when they stop or lower an antidepressant. They are one of several antidepressant withdrawal symptoms, along with dizziness, nausea, and irritability. Symptoms are usually temporary. Tapering slowly with a prescriber, rather than stopping suddenly, lowers the risk.
Please don't stop or change an antidepressant on your own. Talk with the person who prescribes it first. If you are having thoughts of suicide, call or text 988 now.
What are brain zaps?
Brain zaps are short jolts or buzzing sensations that people describe as an electric shock in the head. FDA drug labels describe the same thing in clinical terms, listing "sensory disturbances," such as "electric shock sensations," among the reactions that can follow stopping an antidepressant. FDA label: Lexapro (escitalopram)
Studies of several thousand people's reports linked brain zaps most often to stopping suddenly, and found that side-to-side eye movements often set them off. They were usually short-lived, though a few people reported zaps lasting months or longer. The same researchers call brain zaps a poorly understood symptom, and the cause is not known. Primary Care Companion: Brain zaps; Primary Care Companion: Brain zap triggers
What are the symptoms of antidepressant withdrawal?
Antidepressant withdrawal, also called discontinuation syndrome, can affect the body and mood. The UK's National Institute for Health and Care Excellence (NICE) lists these possible symptoms: NICE guideline NG222
- Dizziness, vertigo, or feeling unsteady
- Electric shock sensations
- Irritability, anxiety, low mood, tearfulness, panic attacks, or confusion
- Restlessness or agitation
- Trouble sleeping
- Sweating, nausea, or other stomach symptoms
- Palpitations, tiredness, headaches, and aching joints or muscles
NICE notes that symptoms can come from stopping suddenly, but also from missing doses or not taking a full dose. FDA labels add tremor, ringing in the ears, and, less often, seizures and hypomania, a period of unusually high or driven mood. FDA label: Paxil (paroxetine)
How common is antidepressant withdrawal?
It depends on how it is measured, and researchers still disagree. A 2024 review of 79 studies in Lancet Psychiatry found that about 31% of people had at least one discontinuation symptom after stopping an antidepressant. About 17% of people who stopped a placebo (a sugar pill) reported symptoms too. After accounting for that, the authors estimated that about one in six or seven people have true discontinuation symptoms. Severe symptoms affected about 3% of people who stopped an antidepressant. Lancet Psychiatry: Incidence of discontinuation symptoms
That estimate has been challenged. In 2025, a group of researchers reanalyzed the review, using only the five studies that had measured withdrawal symptoms systematically. They found a pooled rate of 55%, with wide uncertainty. They argued much of the original data came from short trials not designed to track withdrawal. Psychological Medicine: Reanalysis of the 2024 review
A separate 2025 review of 50 clinical trials in JAMA Psychiatry found that, on average, people who stopped an antidepressant had about one more symptom in the first week than people who did not. Dizziness was the most common symptom, followed by nausea, vertigo, and nervousness. JAMA Psychiatry: Antidepressant discontinuation symptoms
In short, many people stop without serious trouble, some have uncomfortable symptoms, and a few have severe ones. No study can predict which group you will be in.
Which antidepressants are more likely to cause withdrawal?
Antidepressants that leave the body quickly tend to cause more withdrawal symptoms. NICE singles out paroxetine (Paxil) and venlafaxine (Effexor) as "more likely to be associated with withdrawal symptoms" and says antidepressants with a short half-life need to be tapered more slowly. NICE guideline NG222 Half-life is the time it takes the body to clear half of a drug. FDA labels give venlafaxine's half-life as about 5 hours, plus about 11 hours for the active compound it breaks down into, and paroxetine's as about 21 hours. FDA label: Effexor XR (venlafaxine); FDA label: Paxil (paroxetine)
The 2024 Lancet Psychiatry review also linked venlafaxine, desvenlafaxine, imipramine, and escitalopram (Lexapro) with more frequent symptoms. Lancet Psychiatry: Incidence of discontinuation symptoms
Fluoxetine (Prozac) leaves the body slowly, over weeks, which its label says "may minimize the risk of discontinuation symptoms." Withdrawal reactions are still listed, though. FDA label: Prozac (fluoxetine)
Dose and time matter too. The venlafaxine label says symptoms were more frequent at higher doses and after longer treatment.
How long do brain zaps and withdrawal symptoms last?
Usually a week or two. NICE says symptoms often appear within a few days of a dose change and "usually go away within 1 to 2 weeks." Sometimes they last longer, in some cases several weeks and occasionally several months, and they can be severe, especially after stopping suddenly. NICE guideline NG222
If symptoms last longer or disrupt daily life, tell your prescriber, who can adjust the plan.
Is it withdrawal, or is my depression coming back?
Timing and the type of symptoms are the biggest clues, but your prescriber should help you sort it out. NICE advises clinicians to reassure people with withdrawal symptoms that they are not having a relapse, because relapse "does not usually happen as soon as you stop." NICE guideline NG222
- Withdrawal usually starts within days of a dose change. It often includes physical symptoms that are not typical of your depression, such as dizziness, brain zaps, or nausea, and it tends to fade over a week or two.
- Relapse usually comes on later and more gradually. It looks like your earlier depression: lasting low mood, loss of interest, and changes in sleep, energy, or appetite.
The 2025 JAMA Psychiatry review found that stopping was not linked to worse depression symptoms in the short term. The authors concluded that depression showing up later is more likely a relapse. JAMA Psychiatry: Antidepressant discontinuation symptoms Researchers warn that mistaking withdrawal for relapse can lead people to stay on a medication longer than they need to. Lancet Psychiatry: Tapering of SSRI treatment
Withdrawal can also cause anxiety and low mood, so the line is not always clear. A simple log of what you feel and when helps your prescriber, and a mental health assessment can help when the picture is hard to read.
Why do prescribers taper antidepressants slowly?
Lowering the dose in small steps gives the brain time to adjust. FDA labels recommend "a gradual reduction in the dose rather than abrupt cessation" whenever possible. FDA label: Lexapro (escitalopram) The National Institute of Mental Health gives the same advice: don't stop a prescribed medication without a health care provider's help, even if you feel better. NIMH: Mental health medications
What is hyperbolic tapering? In 2019, researchers used brain-imaging data to show that the effect of SSRIs is not proportional to dose: each small amount matters more at low doses. They proposed tapering "hyperbolically": cutting by a steady fraction of the current dose, so the cuts get smaller as the dose drops, and tapering over months, down to very low doses before stopping. Lancet Psychiatry: Tapering of SSRI treatment NICE similarly advises reducing in steps, each a proportion of the previous dose, with smaller steps as the dose gets lower and a pace "led by and agreed with" the person. It notes withdrawal "may take weeks or months." NICE guideline NG222
No single schedule suits everyone. The right pace depends on the medication, the dose, how long you have taken it, and how you respond, so the plan belongs with your prescriber.
When should you get urgent help?
Get help right away for any of these:
- Thoughts of suicide or self-harm. Call or text 988, or chat at 988lifeline.org, any time. Antidepressant labels carry a boxed warning about suicidal thoughts, and the venlafaxine label notes them during dose reduction. FDA label: Effexor XR (venlafaxine)
- A seizure, fainting, or another medical emergency. Call 911.
- Unusually high energy, racing thoughts, or very little need for sleep, which can be signs of hypomania. Contact your prescriber the same day.
- Severe symptoms that make it hard to work, drive, or care for yourself. Call your prescriber promptly.
What did HHS announce about antidepressants in 2026?
On May 4, 2026, the U.S. Department of Health and Human Services (HHS) announced an action plan on psychiatric prescribing. Its stated aim is to "promote appropriate psychiatric prescribing and drive deprescribing when clinically indicated." HHS said it would convene an expert panel in July to inform formal clinical guidance on tapering and discontinuation. HHS press release
In a letter to clinicians the same day, HHS agencies wrote that psychiatric medications "can play an important and, at times, essential role in treatment" and that deprescribing "is not synonymous with abrupt discontinuation." HHS Dear Colleague letter The practical message for patients hasn't changed: any decision to stop belongs in a conversation with your prescriber.
How Ambrosia can help
If you are thinking about stopping an antidepressant, or a past attempt was hard, Ambrosia's deprescribing program starts with a full review of your current medications, followed by shared decision-making, gradual tapering where appropriate, and regular follow-up. Some people also ask about pharmacogenomic testing, which looks at how genes affect the way the body processes certain medications. It is one piece of information, not a full answer.
For depression that is still active, our depression treatment program in West Palm Beach combines evidence-based interventions with holistic strategies. Non-medication options include EXOMIND TMS therapy, and our guide to TMS vs. ketamine for depression compares two approaches. If you are struggling between appointments, read about when weekly therapy isn't enough, or set mental health treatment goals to plan what you want from care. When you are ready, admissions can explain the next steps.
Frequently asked questions
Are brain zaps dangerous?
Brain zaps are usually temporary. FDA labels describe withdrawal reactions as generally self-limiting, but serious symptoms have been reported. Tell your prescriber about brain zaps, especially if they are severe or lasting.
Can missing a dose cause brain zaps?
Yes, it can. NICE notes that withdrawal symptoms can follow missed doses or partial doses, not only stopping completely. This is more likely with medications that leave the body quickly.
Does tapering prevent withdrawal completely?
Not always. A gradual taper lowers the risk, but some people still have symptoms. If that happens, your prescriber can slow the pace.
Can you stop Lexapro or another SSRI cold turkey?
FDA labels advise against it. The Lexapro and Paxil labels tell clinicians to advise patients "not to abruptly discontinue" and to discuss any taper with their healthcare provider.
Should I go back on my antidepressant if withdrawal is bad?
Call your prescriber before changing anything. FDA labels say a prescriber may consider returning to the previous dose and then tapering more slowly, but that decision should be made with them.