A single dose of escitalopram reaches its peak effect about 5 hours after you take it, and the drug has a half-life of roughly 27 to 32 hours. That means it takes your body about a day and a half to eliminate just half of a dose. After your last pill, it takes approximately 6 days for 99% of the drug to clear your system entirely.
But “how long does escitalopram last” can mean several different things depending on your situation. You might be wondering how long a daily dose works, when you’ll start feeling better, how long you’ll need to stay on it, or what happens when you stop. Here’s what to expect at each stage.
How Long a Single Dose Stays Active
After you swallow a tablet, escitalopram is absorbed through your digestive tract and reaches its highest concentration in your blood around 5 hours later. From there, your liver gradually breaks it down. With a half-life of 27 to 32 hours, the drug remains active in your body well beyond a single day, which is why once-daily dosing is enough to maintain consistent levels.
When you take escitalopram every day, the drug accumulates to a stable level in your bloodstream over the course of about a week. At that point, the amount entering your system each morning roughly equals the amount being cleared, so you maintain a steady baseline rather than experiencing peaks and valleys throughout the day.
How Long Before You Feel the Benefits
Even though the drug is active within hours, it doesn’t relieve depression or anxiety that quickly. Escitalopram works by gradually shifting the balance of serotonin signaling in your brain, and that process takes time. Some early improvements, particularly in sleep quality, energy, and appetite, can show up within 1 to 2 weeks. These are often the first signs that the medication is working.
The core emotional symptoms take longer. Relief from persistent low mood, loss of interest in things you used to enjoy, or chronic anxiety typically requires 6 to 8 weeks of consistent daily use. This is one of the most common sources of frustration for people starting the medication. If you don’t notice a difference after two or three weeks, that’s normal and not a sign the drug isn’t working. The full picture usually doesn’t come into focus until closer to the two-month mark.
How Long Side Effects Last
Many people experience side effects in the first week or two, most commonly nausea, headaches, drowsiness, or trouble sleeping. These tend to fade as your body adjusts. Headaches, for example, typically resolve within the first week. Other side effects like digestive discomfort or mild dizziness generally settle within a few days to a couple of weeks.
If any side effect persists beyond that adjustment window or feels severe, it’s worth bringing up with your prescriber. Some side effects, particularly sexual side effects like reduced libido or difficulty reaching orgasm, can persist for as long as you take the medication and don’t always resolve on their own with time.
How Long You’ll Stay on It
Escitalopram is not typically a short-term medication. Once it starts working, most prescribers recommend continuing for several months beyond the point where you feel better. This continuation phase helps stabilize your brain chemistry and significantly reduces the risk of relapse. The NHS recommends staying on the medication for at least 6 months after you’ve been feeling well before considering tapering off.
For people with recurrent depression or generalized anxiety disorder, treatment may last a year or longer. The duration depends on your history: if you’ve had multiple episodes of depression, or if your symptoms were severe, a longer course of treatment is generally more protective. This is a conversation between you and your prescriber, and the timeline can be adjusted based on how you’re doing.
How Long It Takes to Leave Your System
After your final dose, escitalopram clears your body in a predictable pattern. With each passing half-life (roughly 27 to 32 hours), the remaining amount drops by half. After about 6 days, 99% of the drug is gone. This is the full washout period.
That clearance timeline matters because of what can happen as the drug leaves. Discontinuation symptoms typically begin within 2 to 4 days of stopping, right around the point when 90% or more of the drug has cleared. Common symptoms include dizziness, irritability, “brain zaps” (brief electric shock-like sensations), nausea, and flu-like feelings. In most cases, these are mild and resolve within a few weeks, though they can occasionally persist for up to 8 weeks or, rarely, longer.
This is why doctors recommend tapering gradually rather than stopping abruptly. A slow, stepwise reduction in dose gives your brain time to readjust to functioning without the drug, which makes the transition significantly smoother. If you’re planning to stop escitalopram, your prescriber can set up a tapering schedule tailored to your dose and how long you’ve been taking it.