How Long Does Escitalopram
Stay in Your System?

Escitalopram — sold under the brand name Lexapro — is one of the most prescribed antidepressants in the world. It is a selective serotonin reuptake inhibitor (SSRI) used to treat major depressive disorder and generalised anxiety disorder. Escitalopram is the active S-enantiomer of citalopram, and is considered one of the most selective and well-tolerated SSRIs available.

How Long Does Escitalopram Stay in Your System?

Escitalopram has an elimination half-life of approximately 27–32 hours, with an average of around 27 hours in healthy adults. After a single dose, it takes approximately 6–7 days (5 half-lives) to be fully cleared from your bloodstream.

After long-term daily use, escitalopram accumulates to a steady state within about 1 week. When stopping after sustained treatment, the drug typically clears within 1–2 weeks, depending on the dose and duration of use. Unlike sertraline, escitalopram has no active metabolites of clinical significance — making its clearance profile relatively straightforward compared to some other SSRIs.

What Affects How Long Escitalopram Stays in Your System?

• Age — Older adults (65+) clear escitalopram approximately 50% more slowly than younger adults. The half-life can extend to 40+ hours in elderly patients, which is why lower starting doses are typically recommended.
• Liver function — Escitalopram is primarily metabolised by CYP2C19 and CYP3A4. Hepatic impairment significantly prolongs the half-life. In moderate liver disease, the half-life nearly doubles.
• CYP2C19 genetics — Poor metabolisers of CYP2C19 (around 2–5% of the population) clear escitalopram significantly more slowly, leading to higher plasma levels at standard doses.
• Dose — Standard doses are 10mg or 20mg daily. Higher doses produce proportionally higher plasma levels and take slightly longer to clear.
• Drug interactions — CYP2C19 inhibitors such as omeprazole and cimetidine can increase escitalopram plasma levels by 50–100%, requiring dose adjustments.

Escitalopram Discontinuation Symptoms

Because escitalopram has a moderately long half-life, discontinuation symptoms are generally milder than with shorter-acting SSRIs like paroxetine. However, stopping abruptly can still cause dizziness, nausea, irritability, sensory disturbances ("brain zaps"), and insomnia within 1–3 days of the last dose.

These symptoms typically resolve within 1–2 weeks as the drug fully clears. A gradual taper — reducing the dose over several weeks — is recommended to minimise discontinuation effects. Always consult your doctor before stopping escitalopram.

Escitalopram is the pharmacologically active S-enantiomer of citalopram. Compared with the racemic parent compound, it has a higher selectivity ratio for the serotonin transporter, which is one reason it is often prescribed at roughly half the milligram dose of citalopram for an equivalent clinical effect. Its mean elimination half-life is approximately 27–32 hours, supporting once-daily dosing and producing steady-state plasma levels after about one week. The U.S. FDA prescribing information for Lexapro, the European Medicines Agency summary of product characteristics, and the U.S. FDA Drug Safety Communication on citalopram QT-interval prolongation all describe these properties; notably, escitalopram is considered to carry a smaller dose-related QT effect than racemic citalopram.

Sources cross-checked: U.S. FDA prescribing information (DailyMed), U.K. NHS medicines information, and additional official references from the European Medicines Agency, NIH MedlinePlus / LiverTox, the WHO Model List of Essential Medicines, or the American Thyroid Association, depending on the medication. This page is general educational information only and is not medical advice.