What Are Brain Zaps? Causes and What to Do

"Brain zaps" is the name people use for a brief, strange sensation in the head, often described as a quick electric shock or jolt. They are unsettling, especially the first time, and many people do not know what they are or who to tell.

Brain zaps are most often linked to antidepressants: they tend to appear when a dose is reduced, a dose is missed, or the medication is stopped. They are recognized as a symptom of antidepressant discontinuation, even though they are still poorly understood.

The most important thing to know up front: if you are having brain zaps, do not stop, restart or change your medication on your own. Talk to the person who prescribes it. They are the one who can work out what is happening and what to do next.

What brain zaps feel like

Researchers describe brain zaps as sensations felt as electrical flashes inside the brain. They can arrive on their own, or alongside other discontinuation symptoms such as dizziness, headache, nausea or trouble sleeping.

One consistent finding is that brain zaps are often triggered by moving the eyes quickly from side to side. Researchers who studied thousands of first-hand reports saw this pattern clearly enough to suggest it as a lead for future research.

For most people, brain zaps are temporary. In a small number of cases, they have been reported to last for months and to affect daily life significantly.

Why brain zaps happen

The honest answer is that nobody fully knows. Brain zaps are described as a poorly understood symptom, and there has been very little formal research on them.

What the research does show is a link with falling antidepressant levels in the body. In one analysis, the timing of when zaps started lined up with how quickly a given medication leaves the body, which supports the idea that they are connected to discontinuation. The same research found that stopping suddenly was the most likely trigger, and that a gradual reduction helped only partly.

Because they are tied to falling medication levels, it is worth telling your prescriber about any missed or late doses, not only planned changes.

How common are discontinuation symptoms?

Brain zaps are one of several possible discontinuation symptoms. Others include dizziness, headache, nausea, trouble sleeping and irritability.

A large 2024 review of 79 studies looked at how often these symptoms happen. About one in three people who stopped an antidepressant reported at least one symptom. But people who stopped a placebo reported symptoms too, and once the researchers accounted for that, they estimated that roughly one in six or seven people experience discontinuation symptoms as a direct result of stopping the medication. Severe symptoms were much less common.

So discontinuation symptoms are real and fairly common, but they are not a given, and most are not severe. That is useful to know if you are worried about it.

Brain zaps or the depression coming back?

This is where things can get confusing. Discontinuation symptoms can overlap with the symptoms of depression or anxiety, such as low mood, irritability and poor sleep. Researchers have pointed out that withdrawal can be mistaken for the original condition returning, which can lead to decisions about medication that are not actually needed.

Timing, the kind of symptoms, and how they change over the following days all help tell the two apart. That is a clinical judgment, and it is exactly why a prescriber should be involved. If you are not sure whether what you are feeling is low mood or something harder to name, our articles on depression without sadness and emotional numbness may help you describe it.

Never stop or change your medication on your own

This bears repeating. You should not stop a prescribed medication, even if you are feeling better, without the help of the provider who prescribes it. If stopping is the right call, a prescriber can plan a slow and safe reduction.

Research suggests that slower, more gradual reductions are better tolerated than quick ones. But the right pace depends on the medication, how long you have taken it and how you respond, which is why it needs to be planned with your prescriber and not worked out from something you read online.

The same goes for restarting a medication you have stopped, or skipping doses to "test" how you feel. Bring it to your prescriber first.

What to do if you are having brain zaps

• Contact your prescriber. Tell them what you are feeling, when it started, and whether you have missed, reduced or stopped any doses.
• Keep a short note. When the zaps happen, what seems to trigger them, and anything else you are noticing, such as dizziness, sleep changes or mood shifts.
• Do not adjust your dose yourself while you wait to hear back.
• Get help straight away if your mood drops sharply or you have thoughts of harming yourself. Call or text 988, or call 911 in an emergency.

How this is handled in our program

In our intensive outpatient program, you keep your existing prescriptions when you join, and our prescriber coordinates with your outside provider rather than replacing them. Any change to a medication is made only when it is clinically appropriate, and only after it has been talked through with you.

Because you are here three mornings a week, symptoms like brain zaps tend to come up early, in group or in your individual session, rather than weeks later. Our in-house psychiatric team can then look at them alongside what your therapists are seeing. Our article on how medication management works in an IOP explains the process in more detail.

If you are thinking about changing or coming off a medication and want more support around it, a free pre-assessment is a good place to start. You can reach admissions here.