Stopping citalopram, especially abruptly, can trigger a set of temporary physical and psychological symptoms known as antidepressant discontinuation syndrome. Symptoms typically begin within two to four days of your last dose and last one to two weeks for most people. Not everyone experiences them, but understanding what to expect makes the process far less alarming.
Why Your Body Reacts to Stopping
Citalopram works by blocking the reabsorption of serotonin in the brain, keeping more of it available in the spaces between nerve cells. It’s a highly selective serotonin reuptake inhibitor, meaning it focuses almost entirely on serotonin without significantly affecting other chemical messengers like dopamine or norepinephrine.
When you take citalopram consistently, your brain adapts to this higher level of available serotonin. It adjusts its own production, the sensitivity of its receptors, and its overall chemical balance around the assumption that the drug will keep showing up. When the drug is suddenly removed, serotonin levels drop faster than your brain can recalibrate. That mismatch between what your nervous system expects and what it’s actually getting is what produces withdrawal symptoms. The effects are felt throughout the body because serotonin doesn’t just regulate mood; it plays a role in digestion, sleep, pain perception, and coordination.
Common Withdrawal Symptoms
Citalopram carries a moderate risk for discontinuation syndrome among antidepressants. A large meta-analysis published in The Lancet Psychiatry estimated that roughly 15% of patients, about one in six or seven, experience discontinuation symptoms specifically attributable to stopping their medication rather than general discomfort anyone might feel. About one in 35 patients will have symptoms considered severe.
The symptoms tend to fall into a few clusters:
- Flu-like symptoms: fatigue, headache, body aches, sweating, stomach cramps, nausea, and occasionally vomiting.
- Dizziness and balance problems: lightheadedness, vertigo, and an unsteady gait.
- Sleep disruption: insomnia, unusually vivid dreams, or nightmares.
- Sensory disturbances: tingling, numbness, hypersensitivity to sound, or the widely reported “brain zaps,” a brief sensation resembling an electric shock to the head.
- Mood changes: anxiety, irritability, agitation, confusion, and in some cases feelings of depression or paranoia.
- Movement issues: tremors, restless legs, and difficulty coordinating speech or chewing.
Brain zaps are one of the most distinctive and unsettling symptoms. They aren’t dangerous, but they can be jarring. The exact mechanism isn’t fully understood. Researchers believe sudden shifts in serotonin levels and receptor sensitivity disrupt normal electrical signaling in the brain, producing those brief shock-like sensations.
Timeline: When Symptoms Start and How Long They Last
Most people notice the first symptoms two to four days after their last dose. Citalopram has a relatively short half-life, meaning it clears your system fairly quickly. Within a few days, blood levels drop low enough for your brain to notice the absence.
For the majority of people, symptoms resolve within one to two weeks. The first week is usually the most uncomfortable, with symptoms gradually fading after that. In a smaller number of cases, particularly after long-term use or abrupt cessation, some symptoms can linger longer. If you restart a low dose and taper more slowly, symptoms typically resolve quickly.
Stopping Abruptly vs. Tapering Gradually
Quitting cold turkey significantly increases both the likelihood and intensity of withdrawal symptoms. It also raises the risk that your original symptoms of depression or anxiety will return, and possibly return more sharply than they would have with a gradual approach.
Clinical guidelines recommend reducing your dose by about 25% every one to four weeks. As you approach the lowest dose, even smaller reductions of around 12.5% help smooth the transition. The final step is staying on that lowest dose for about two weeks before stopping entirely. This gives your brain time to adjust at each stage rather than facing one large disruption.
One common mistake is dropping to a very low dose and taking it every few days instead of daily. Because citalopram leaves your system quickly, this creates a roller coaster of rising and falling drug levels. You end up cycling between minor withdrawal and the side effects of restarting, which is worse than a steady, gradual reduction.
If withdrawal symptoms become difficult during a taper, the standard advice is to go back to the last dose that felt manageable, stay there for six to twelve weeks, and then resume the taper at a slower pace, cutting by as little as 5% to 12.5% per month.
Withdrawal Symptoms vs. Returning Depression
One of the trickiest parts of stopping citalopram is figuring out whether what you’re feeling is temporary withdrawal or your depression coming back. The two can look similar, since discontinuation syndrome can include low mood, anxiety, and irritability.
A few differences help sort them out. Withdrawal symptoms almost always include physical complaints that aren’t typical of depression on its own: dizziness, flu-like feelings, brain zaps, tingling, and digestive upset. If you’re experiencing those alongside mood changes, withdrawal is the more likely explanation. Timing matters too. Withdrawal symptoms begin within days of stopping or reducing the dose, while a genuine depressive relapse tends to develop more gradually, often over weeks.
Withdrawal symptoms also tend to improve steadily over one to two weeks. A relapse of depression, by contrast, doesn’t fade on its own and typically worsens over time. If your mood symptoms persist or deepen beyond the two-week mark after your last dose change, that’s a signal worth paying attention to, because it may indicate the underlying condition reasserting itself rather than a temporary adjustment period.
What Makes Withdrawal More Likely
Several factors influence whether you’ll experience discontinuation symptoms and how intense they’ll be. Taking citalopram for a longer period means your brain has had more time to adapt, so the adjustment back is steeper. Higher doses create a larger gap between medicated and unmedicated serotonin levels. Stopping abruptly rather than tapering is the single biggest controllable risk factor.
Individual biology plays a role too. Some people are naturally more sensitive to changes in serotonin signaling. If you’ve had withdrawal symptoms from other medications in the past, you’re more likely to experience them with citalopram. Among SSRIs, citalopram falls in the moderate risk category. Paroxetine and the closely related drug escitalopram tend to cause more frequent or more severe discontinuation effects, while some other antidepressants with longer half-lives cause fewer problems because they leave the body more gradually on their own.