If you abruptly stop taking Lexapro, there’s roughly a 1 in 5 chance you’ll experience a cluster of uncomfortable symptoms known as discontinuation syndrome. These symptoms typically start within one to three days after your last dose and can range from mild dizziness to intense electric shock sensations in your head. While rarely dangerous, stopping cold turkey can make you feel significantly worse than a gradual taper would.
Why Stopping Suddenly Causes Problems
Lexapro works by increasing serotonin activity in your brain, but that’s just the starting point. Over weeks and months of use, your brain undergoes a series of structural and functional changes in response to that elevated serotonin. Neural pathways adapt, receptors adjust their sensitivity, and your brain essentially recalibrates around the presence of the drug.
When you suddenly remove Lexapro, your brain doesn’t snap back to its pre-medication state overnight. There’s a rebound spike in serotonin neuron activity that throws things off balance. Lexapro has a half-life of about 27 to 33 hours, meaning the drug level in your blood drops by half roughly every day. Within a few days of your last dose, levels fall low enough that your recalibrated brain notices the absence, and that’s when symptoms hit.
What Discontinuation Symptoms Feel Like
The symptoms can show up across your entire body and mind. The most distinctive one, and the symptom people search for most often, is “brain zaps”: brief electric shock sensations in the head that can also radiate through the body. These don’t have a clear parallel in everyday experience, and they’re one of the hallmarks that distinguish discontinuation from other conditions.
Beyond brain zaps, symptoms fall into several categories:
- Physical: Dizziness, headache, nausea, diarrhea, flu-like achiness, fatigue, tremor, and sweating
- Emotional: Irritability, anxiety, sudden crying spells, mood swings, agitation, and in some cases increased thoughts of self-harm
- Sleep-related: Insomnia, vivid or disturbing dreams, nightmares
- Sensory: Tingling or numbness, ringing in the ears, blurred vision, sensitivity in the skin
- Cognitive: Difficulty concentrating, confusion, feeling mentally foggy
Not everyone gets all of these. Some people stop Lexapro abruptly and feel nothing unusual. Others are knocked flat for days. The severity depends on several factors: how long you’ve been taking Lexapro, what dose you’re on, how quickly you stop, and your individual biology. Someone who’s been on 20 mg for two years is more likely to have a rough time than someone on 5 mg for a few months.
How Long Symptoms Last
Symptoms typically begin one to three days after your last dose, though some people notice changes within hours and others not until a week or more later. For most people, the acute phase resolves within one to two weeks.
However, some people experience symptoms that linger beyond that window. Mood instability in particular can persist longer than the physical symptoms. There’s limited research on how common prolonged symptoms are, but they’ve been documented, especially with other SSRIs like paroxetine. If symptoms are still present after several weeks, that raises a different question: is this still discontinuation, or is your original depression or anxiety returning?
Discontinuation vs. Relapse
This is one of the trickiest parts of stopping Lexapro, and it’s worth understanding the difference. Discontinuation symptoms and a relapse of your original condition can look similar on the surface, since both can involve anxiety, low mood, and irritability. But there are key distinctions.
Timing is the first clue. Discontinuation symptoms tend to appear within days. A true relapse of depression or anxiety typically develops weeks or months after stopping medication. The nature of the symptoms also differs. Discontinuation often produces symptoms you never had before, like brain zaps, dizziness, or a strange dream-like feeling of unreality (depersonalization). A relapse tends to feel like your original condition coming back.
There’s also a useful test: if you restart Lexapro and the symptoms clear up quickly, within a day or two, that points to discontinuation syndrome. A relapse takes longer to respond, typically weeks, consistent with the time antidepressants normally take to work. Knowing this distinction matters because it changes what you should do next. Discontinuation is a temporary adjustment problem. Relapse may mean you still need the medication.
Why Tapering Matters
Most guidelines recommend tapering over at least two to four weeks, gradually stepping down from your current dose to the lowest available dose before stopping entirely. This gives your brain time to readjust at each step rather than losing all serotonin support at once.
Recent research suggests that even standard tapers may not be slow enough for some people. A group of researchers proposed that SSRIs should be tapered “hyperbolically,” meaning the dose reductions get smaller as you approach zero. The logic is that the relationship between dose and effect on serotonin isn’t linear. Going from 20 mg to 10 mg is a much smaller change in brain serotonin activity than going from 10 mg to zero. So the final steps of a taper are the ones that need the most care.
In practice, this might mean stepping from 20 mg to 10 mg, then to 5 mg, then to 2.5 mg (using a pill cutter or liquid formulation), with a week or more between each reduction. Your prescriber can help you design a schedule based on your dose and how long you’ve been on the medication.
What to Do If You’ve Already Stopped
If you’ve already quit cold turkey and you’re experiencing symptoms, the most effective immediate remedy is restarting the medication at your previous dose. Symptoms typically resolve quickly once you do. From there, you can work with your prescriber to taper gradually.
If your symptoms are mild and manageable, you may choose to ride them out. Most acute symptoms resolve within one to two weeks. Staying hydrated, keeping a regular sleep schedule, and avoiding alcohol can help your body adjust. But if you’re experiencing severe mood changes, especially increased thoughts of self-harm, restarting the medication and tapering properly is the safer path.
One important note: if you’ve been off the medication for a while and delayed restarting, the response can be less predictable. The sooner you act, the more reliably symptoms will resolve.