Short answer: stopping an antidepressant suddenly, especially after weeks or months of use, can cause a cluster of physical and emotional symptoms called discontinuation symptoms, and it can also allow the depression, anxiety, or other condition the medication was treating to return or worsen. Most antidepressants should be tapered off gradually under a doctor's guidance rather than stopped all at once.

Why Antidepressants Should Not Be Stopped Abruptly

Antidepressants change the levels and activity of brain chemicals like serotonin and norepinephrine over time. Your nervous system gradually adjusts to the medication being present. When the drug is removed suddenly, the brain has not had time to readjust, which can trigger a temporary but often uncomfortable set of symptoms known as antidepressant discontinuation syndrome. Separately, and just as important, stopping treatment can let the original condition, whether depression, anxiety, or another disorder, come back, sometimes more intensely than before.

Antidepressant Discontinuation Syndrome: What It Feels Like

Discontinuation symptoms typically begin within a few days of stopping or significantly reducing the dose, and they generally resolve within one to three weeks, though this varies. Common symptoms include:

• Flu-like symptoms: fatigue, headache, muscle aches, chills
• Dizziness, lightheadedness, or a sense of imbalance
• "Brain zaps," a brief electric-shock sensation in the head, most often reported with SSRIs and SNRIs
• Nausea, vomiting, or stomach upset
• Sleep problems, including insomnia or vivid dreams
• Irritability, anxiety, or a low mood that feels different from your usual depression
• Sensory disturbances such as tingling or a buzzing feeling

These symptoms are more likely, and often more intense, with medications that leave the body quickly, such as paroxetine and venlafaxine. Fluoxetine, which stays in the system much longer, tends to cause milder or no discontinuation symptoms because its levels fall off gradually on their own.

Discontinuation Symptoms Are Not the Same as Addiction

It is worth being clear: antidepressants are not considered addictive medications. People do not build a psychological craving for them or need escalating doses to feel a high. Discontinuation symptoms reflect the nervous system readjusting to the absence of the drug, which is a physiological process, not a sign of dependence in the way that term is used for substances of abuse.

The Bigger Risk: Return of the Underlying Condition

Beyond discontinuation symptoms, stopping an antidepressant abruptly removes the treatment that was managing depression, anxiety, obsessive-compulsive disorder, or another condition. Symptoms of that underlying condition can return, sometimes quickly and sometimes more severely than before treatment started. This is a separate and often more serious concern than the physical discontinuation symptoms, because a relapse of depression can include a return of hopelessness or suicidal thinking. This is one of the main reasons abrupt stopping is discouraged and why any change in an antidepressant should involve your prescriber.

How to Stop an Antidepressant Safely

If you and your doctor decide it is time to stop or change your antidepressant, the standard approach is a gradual taper, reducing the dose in steps over weeks to months rather than stopping all at once. The right pace depends on which medication you take, how long you have been on it, your dose, and your individual response. Your prescriber may also switch you temporarily to a longer-acting antidepressant like fluoxetine to ease the taper. Do not adjust your own dose or stop on your own, even if you feel better, without talking to the clinician who prescribed it.

Practical Takeaways

• Never stop an antidepressant abruptly without medical guidance, even if you feel well.
• Missing several doses in a row can trigger the same discontinuation symptoms as intentionally stopping, so keep refills current and set reminders.
• If you want to stop, talk to your prescriber about a taper plan rather than quitting outright.
• Track your mood and any new symptoms during a taper and report changes to your doctor promptly.
• If cost or access is the reason you are considering stopping, tell your doctor. There are often lower-cost options or samples available rather than going without.

When to Seek Medical Care