Lexapro (escitalopram) is a prescription antidepressant used primarily to treat depression and anxiety. It belongs to a class of medications called selective serotonin reuptake inhibitors, or SSRIs, and is one of the most commonly prescribed antidepressants in the United States. The FDA has approved it for two specific conditions, though doctors frequently prescribe it for several others.
FDA-Approved Uses
Lexapro carries formal FDA approval for two conditions. The first is major depressive disorder (MDD) in adults and adolescents aged 12 to 17. The second is generalized anxiety disorder (GAD) in adults only. It is not approved for children under 12 for any condition, and its effectiveness for anxiety has not been established in anyone under 18.
For depression, Lexapro is approved for both short-term treatment of active episodes and longer-term maintenance therapy to prevent relapse. For anxiety, formal evidence supports its use for acute treatment periods of up to eight weeks, though many people take it longer based on their doctor’s judgment.
Common Off-Label Uses
Doctors also prescribe Lexapro for conditions it hasn’t been formally approved for, a common and legal practice known as off-label prescribing. These include obsessive-compulsive disorder (OCD), panic disorder, social anxiety disorder, and post-traumatic stress disorder (PTSD). Canadian clinical guidelines for anxiety disorders list escitalopram among the recommended treatments for several of these conditions, and clinical trials have shown it can help prevent OCD relapse.
How Lexapro Works
Serotonin is a chemical messenger in the brain that helps regulate mood, sleep, and anxiety. After serotonin delivers its signal between brain cells, a protein called the serotonin transporter normally reabsorbs it. Lexapro blocks this transporter, leaving more serotonin available in the gaps between cells.
What makes Lexapro somewhat unusual among SSRIs is how it attaches to the serotonin transporter. It binds to two spots on the transporter simultaneously. The second binding site locks the drug in place at the first site, slowing its release and keeping the transporter blocked for longer. This dual-binding mechanism is thought to contribute to its effectiveness relative to other SSRIs.
How Effective It Is
In pooled clinical trial data involving over 1,300 patients with depression, about 54% of people taking Lexapro experienced a meaningful response after eight weeks, compared to 37% on placebo. Roughly 44% achieved remission, meaning their depression symptoms dropped to minimal levels, versus 32% on placebo.
The benefits were even more pronounced in people with more severe depression. Response rates were 54% on Lexapro versus 33% on placebo, and remission rates were 39% versus 25%. Overall, about 1 in 5 patients benefited specifically because of the medication rather than a placebo effect, translating to a “number needed to treat” of 5. That means for every five people prescribed Lexapro, one will improve who wouldn’t have improved on a sugar pill.
Typical Dosing
The standard starting dose is 10 mg once daily for both depression and anxiety. Many people stay at this dose, as it’s also the recommended maintenance level. If 10 mg isn’t sufficient, the dose can be increased to a maximum of 20 mg per day. Adults typically wait at least one week before increasing, while adolescents wait at least three weeks.
Lexapro is taken once a day, with or without food, and it doesn’t matter whether you take it in the morning or evening, though some people prefer morning dosing if it affects their sleep.
How Long It Takes to Work
You may notice early improvements in sleep, energy, and appetite within the first one to two weeks. The full mood and anxiety benefits typically take four to six weeks to develop. This delay is one of the most important things to know going in, because many people assume the medication isn’t working and stop too early.
Common Side Effects
The most frequently reported side effects include nausea, insomnia, drowsiness, increased sweating, fatigue, and sexual side effects such as reduced libido or difficulty with orgasm. Most of these are mild and tend to improve within the first few weeks as your body adjusts. Nausea in particular often fades after the first week or two. Sexual side effects, however, can persist for as long as you take the medication.
Important Safety Considerations
All antidepressants, including Lexapro, carry an FDA boxed warning about an increased risk of suicidal thoughts and behavior in children, adolescents, and young adults. This risk is highest in the early weeks of treatment or when doses change. It does not mean the medication causes suicide, but close monitoring is important during these periods, especially for younger patients.
Pregnancy and Breastfeeding
Lexapro can be taken during pregnancy. A small number of studies have suggested a possible, slight increase in the risk of heart development issues in babies, but the NHS notes that the majority of babies born to women taking escitalopram have normal hearts. Taking it in the final weeks before delivery can occasionally cause short-term withdrawal symptoms or, very rarely, breathing difficulties in newborns.
If you’re breastfeeding, Lexapro passes into breast milk in small amounts. It doesn’t usually cause problems, though a few breastfed babies have shown irritability or restlessness. If your baby is healthy, most guidelines consider it safe to continue.
Stopping Lexapro Safely
Stopping Lexapro abruptly can trigger discontinuation syndrome, a set of symptoms that includes dizziness, flu-like feelings, irritability, anxiety, and a distinctive sensation some people describe as “brain zaps,” brief electric-shock-like feelings in the head. These aren’t dangerous, but they can be deeply unpleasant.
The standard approach is to taper the dose gradually over weeks to months, reducing it in small increments every two to six weeks. The exact schedule depends on how long you’ve been taking it, your current dose, and how sensitive you are to changes. If symptoms flare during tapering, going back to the previous dose and slowing the process down usually helps. Timing matters too: it’s best not to start tapering during a stressful life period like a job change or illness.