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Is Lexapro an Antidepressant? The Quick Answer Plus What Patients Should Know

DM

Reviewed by Daniel Montville, MD, Psychiatrist

SiggyMD Clinical Team · Last updated June 4, 2026

Medications Lexapro Escitalopram SSRI Antidepressants Drug Education

Key Takeaways

  • Yes, Lexapro (escitalopram) is an antidepressant in the SSRI class. It is FDA-approved for major depressive disorder in adults and adolescents aged 12 and older. It is also FDA-approved for generalized anxiety disorder in adults and children as young as age 7.
  • Escitalopram is the purified active form of citalopram (Celexa). It contains only the S-enantiomer of citalopram, which is the pharmacologically active molecule. This gives escitalopram fewer off-target drug interactions than most other SSRIs at standard doses.
  • In a network meta-analysis of 522 trials and 116,477 patients published in The Lancet in 2018, escitalopram ranked among the top antidepressants for both efficacy and tolerability (the rate at which patients remained on the medication).
  • Common side effects include nausea (typically resolves within the first two weeks), sexual dysfunction, trouble sleeping, and fatigue. Like all SSRIs, Lexapro carries an FDA black box warning for increased suicidal ideation risk in patients under age 25, particularly during the first weeks of treatment.
  • Lexapro is available as generic escitalopram at a fraction of the brand price. Starting dose is 10 mg once daily; the maximum recommended dose for depression is 20 mg/day. Full effects typically take four to eight weeks.

Yes, Lexapro is an antidepressant. That is the quick answer.

The longer answer is more useful. Lexapro is also FDA-approved for anxiety, and many patients who are prescribed it are treating anxiety rather than depression. Understanding what Lexapro actually is, why prescribers choose it, and what to expect from it helps people get more from their treatment and stop less often before it has a chance to work.

What This Page Covers

  • What Lexapro is and how it works
  • What conditions it is approved to treat
  • How it compares to related medications
  • Side effects and what to watch for
  • Dosing and timeline
  • Key safety information

What Lexapro Is

Lexapro is the brand name for escitalopram, an antidepressant in the selective serotonin reuptake inhibitor (SSRI) class. It is available as both a tablet and an oral solution. Generic escitalopram has been available since 2012 at a fraction of the brand price.

In 2023, escitalopram was the second most prescribed antidepressant and the fourteenth most commonly prescribed medication in the United States, with more than 37 million prescriptions. It is on the World Health Organization’s List of Essential Medicines.

How It Works

Lexapro works by blocking the serotonin transporter, a protein that normally recycles serotonin from the synapse back into the neuron. When this transporter is blocked, serotonin accumulates in the synaptic space between neurons and can continue activating receptors. This increase in serotonergic activity, over time, produces neuroadaptive changes that reduce depression and anxiety symptoms.

Escitalopram is considered the most selective SSRI available. It acts almost exclusively on the serotonin transporter with minimal effects on other receptors. This selectivity gives it a somewhat cleaner side effect profile and fewer drug interactions at standard doses compared to less selective SSRIs.

The chemistry with Celexa: Escitalopram is the S-enantiomer of citalopram. Citalopram (Celexa) is a mixture of two mirror-image molecules, only one of which is pharmacologically active. Escitalopram is the purified, active form. This is why Lexapro can be effective at 10 mg while citalopram is typically prescribed at 20 to 40 mg for the same effect.

What Lexapro Is Approved to Treat

This is the part that surprises many patients. Lexapro is not just for depression.

FDA-approved indications:

Frequently used off-label:

If a prescriber recommended Lexapro for anxiety, that is an FDA-approved, evidence-based use. Most SSRIs treat both depression and anxiety because the two conditions share overlapping neurochemistry, and the serotonergic mechanism addresses both.

How Lexapro Compares to Other SSRIs

Versus Celexa (citalopram): Escitalopram is the purified active form of citalopram. A major network meta-analysis in The Lancet in 2018, covering 522 trials and 116,477 patients, found escitalopram among the top antidepressants for both efficacy and tolerability. Lexapro has broader FDA approvals and can be prescribed in younger patients.

Versus Zoloft (sertraline): Both are first-line SSRIs ranked among the best-tolerated. Zoloft has a broader set of FDA-approved indications including OCD, PTSD, panic disorder, and PMDD. Lexapro is considered more selective with fewer drug interactions, while Zoloft has mild dopaminergic activity that can feel slightly more activating in the first weeks. For generalized anxiety disorder specifically, Lexapro is FDA-approved while Zoloft is often used off-label.

Versus Prozac (fluoxetine): Prozac has the longest half-life of any SSRI, making it the most forgiving for missed doses. Both are effective first-line options. Prozac is FDA-approved for bulimia nervosa and OCD in addition to depression; Lexapro is not.

What Side Effects to Expect

Common and often temporary:

  • Nausea. The most reported early side effect. It typically appears in the first one to two weeks and resolves as the body adjusts. Taking Lexapro with food can help.
  • Trouble sleeping. Some patients experience insomnia or vivid dreams early in treatment, while others find it slightly sedating. Both patterns typically stabilize within a few weeks.
  • Fatigue or somnolence. More common in older adults. Taking the dose at night rather than morning can help if this is bothersome.
  • Sexual dysfunction. Decreased libido, delayed orgasm, and arousal difficulties are well-established SSRI effects. They can affect men and women and may persist as long as the medication is taken. See SSRI sexual side effects for strategies to address this.
  • Headache. Usually occurs in the first week and resolves.

Weight: Studies estimate weight gain affects 25% to 41% of patients on escitalopram, with average gains of approximately 1% to 3.7% of body weight.

Important Safety Warnings

All SSRIs carry an FDA black box warning for increased suicidal ideation risk in patients under 25, particularly during the first weeks of treatment and after dose changes. Patients under 25 should be monitored closely during early treatment. If you are experiencing worsening depression, agitation, or thoughts of self-harm, contact a prescriber immediately or call 988.

MAOIs: Do not take Lexapro within 14 days before or after an MAOI antidepressant. The combination can cause serotonin syndrome, a serious and potentially life-threatening condition.

Pimozide: Do not combine with Lexapro due to cardiac risk.

Bleeding risk: SSRIs inhibit platelet aggregation. Use caution with NSAIDs, aspirin, or anticoagulants.

Abrupt stopping: Stopping escitalopram suddenly can cause discontinuation symptoms including dysphoric mood, irritability, agitation, dizziness, and electric-shock sensations. Always taper under prescriber guidance.

Bipolar disorder: Lexapro, like all SSRIs, can trigger mania in patients with undiagnosed bipolar disorder. Prescribers screen for this before starting treatment.

Dosing

The recommended starting dose of Lexapro is 10 mg once daily for both depression and generalized anxiety disorder. For depression, the dose may be increased to 20 mg after at least one week if needed. Lexapro can be taken with or without food, at any time of day.

Timeline: Effects may begin appearing within the first two weeks for sleep or reactivity. Full antidepressant and anxiolytic effects typically take four to eight weeks. Do not evaluate whether it is working based on week one.

Generic cost: Generic escitalopram is available for approximately $4 to $10 per month.

What to Monitor

Once on a stable dose, monitoring for Lexapro includes side effect trajectory across the first weeks, sexual side effects if present, and mood trajectory against pre-treatment baseline. Patients over 65 are monitored for low sodium (hyponatremia), which SSRIs can cause.

“The most important thing I tell patients starting Lexapro is that the week you feel nothing is not week one: it is week four,” says Daniel Montville, MD, Psychiatrist at SiggyMD. “Most people who stop at week two do so before the medication has produced any therapeutic effect at all. When I have daily check-in data from that period, I can see whether their sleep is improving even while their mood has not changed yet. That early signal is enough to keep most patients in treatment through the window that matters.”

What Members Are Saying

DR

D.R., 33

Generalized Anxiety Disorder

“I was confused when my prescriber prescribed Lexapro because I thought it was only for depression. She explained that it is also FDA-approved for anxiety and is one of the most common first-line choices. I had been on it for six weeks when I realized I was sleeping through the night for the first time in two years. It works. I just needed to understand what I was taking.”

LM

L.M., 26

Major Depressive Disorder and Social Anxiety

“I had tried another antidepressant before and stopped it because the side effects were bad in the first two weeks. With Lexapro, my prescriber prepared me: the nausea is normal and temporary, and things may feel slightly worse before they feel better. That context made it possible to stay on it. By week six, I noticed I was actually showing up for my life again.”

Member stories reflect real experiences. Names and identifying details have been changed to protect privacy. Results vary. SiggyMD is currently invite-only.

Bottom Line

Lexapro is an antidepressant. It is also FDA-approved for anxiety. It is one of the most commonly prescribed medications in the United States for good reason: a large body of evidence supports its efficacy and tolerability, it is available as an inexpensive generic, and its side effect profile is relatively clean compared to older antidepressants and some other SSRIs.

What patients most often get wrong is the timeline. Full effects take four to eight weeks. Early side effects are common and temporary. Stopping in week two is not giving the medication a fair trial.

Start your anonymous intake with SiggyMD, where a licensed prescriber reviews your full clinical picture before anything is prescribed, and daily check-ins track how the medication is working between visits. You can also read about how long anxiety medication takes to work for the full timeline framework.

Sources

Frequently Asked Questions

Is Lexapro an antidepressant or an anti-anxiety medication?

Both. Lexapro (escitalopram) is classified as an antidepressant in the SSRI class. It is FDA-approved for major depressive disorder and generalized anxiety disorder. Most SSRIs treat both conditions because depression and anxiety share overlapping neurochemistry involving serotonin. If Lexapro was prescribed for your anxiety, that is an FDA-approved, evidence-based use, not an off-label one.

What is the difference between Lexapro and Celexa?

Celexa (citalopram) and Lexapro (escitalopram) are chemically related. Citalopram is a mixture of two mirror-image molecules; escitalopram is the purified version containing only the active S-enantiomer. Lexapro is FDA-approved for both depression and anxiety and can be used in younger patients (adolescents and children for GAD). Celexa is FDA-approved for depression in adults only. Most clinical guidelines treat them as equivalent for most situations, though some studies suggest escitalopram may have a slight efficacy advantage.

How is Lexapro different from Zoloft?

Both are SSRIs and first-line treatments for depression and anxiety. Zoloft (sertraline) has a broader set of FDA-approved indications, including PTSD, OCD, panic disorder, and PMDD. Lexapro is considered more selective in its serotonin action and tends to have fewer drug interactions at standard doses. Zoloft can feel slightly more activating in the first weeks for some patients. For generalized anxiety disorder specifically, Lexapro is FDA-approved while Zoloft is often used off-label. A major 2018 Lancet network meta-analysis ranked both in the top tier for efficacy and tolerability among antidepressants.

How long does Lexapro take to work?

Full therapeutic effects typically take four to eight weeks. Some patients notice early improvement in sleep or reactivity within the first two weeks, but the main antidepressant and anxiolytic effect builds gradually. Like all SSRIs, Lexapro can temporarily worsen anxiety in about 15% of patients during the first one to two weeks before the therapeutic effect develops. Do not stop based on how it feels in week one. Contact your prescriber if the worsening is severe.

Does Lexapro cause weight gain?

Some patients experience weight gain on Lexapro. Studies estimate weight gain affects 25% to 41% of patients on escitalopram, with average gains of approximately 1% to 3.7% of body weight during treatment. The mechanism involves escitalopram's effects on serotonin pathways that also influence appetite and metabolism. Weight changes are more common at higher doses and with longer duration of use. If this is a concern, discuss it with your prescriber before starting.

What should I avoid while taking Lexapro?

Do not take Lexapro with MAOIs or within 14 days of stopping an MAOI. Do not take pimozide with Lexapro due to cardiac risk. Use caution with NSAIDs, aspirin, or blood thinners, as SSRIs reduce platelet activity. Limit alcohol. Tell your prescriber about all supplements, especially St. John's Wort. Do not stop Lexapro abruptly, as this can cause discontinuation symptoms including dizziness, irritability, and electric-shock sensations.

Can you take Lexapro if you are not depressed?

Yes. Lexapro is FDA-approved for generalized anxiety disorder, which is a distinct condition from depression. Many patients take Lexapro specifically for anxiety without a depression diagnosis. It is also used off-label for social anxiety disorder, panic disorder, OCD, and PTSD. If your prescriber recommended Lexapro for anxiety, this is a common and well-supported use of the medication.

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