Escitalopram Side Effects: What to Expect and When to Call Your Doctor

Escitalopram (Lexapro) is one of the most commonly prescribed antidepressants in the United States, and it has a reputation for being well-tolerated relative to older antidepressants. However, like all medications, it does cause side effects in some patients. Understanding what's normal, what's worth monitoring, and what requires a call to your doctor is an important part of using escitalopram safely.

Boxed Warning: Suicidal Thoughts in Young Patients

Escitalopram carries the FDA's most serious warning — a black box warning — about an increased risk of suicidal thoughts and behaviors in children, adolescents, and young adults (up to age 24), particularly in the first few months of treatment or when the dose is increased. This risk is not observed in adults over 24 and appears to decrease with age.

If you or someone you care for is under 24 and starting escitalopram, close monitoring during the first 4-8 weeks of treatment is essential. Report any new or worsening thoughts of self-harm, unusual mood changes, agitation, or aggressive behavior to your provider immediately.

If you or someone you know is in crisis, call or text 988 (Suicide and Crisis Lifeline) 24/7.

Common Side Effects (Usually Mild and Temporary)

Most side effects from escitalopram are mild and tend to improve as your body adjusts to the medication during the first 2-4 weeks. Common side effects include:

• Nausea: The most commonly reported side effect, especially when starting. Taking escitalopram with food can reduce nausea.
• Insomnia or drowsiness: Sleep disruption is common in the first few weeks. Taking escitalopram in the morning (if it causes insomnia) or at night (if it causes drowsiness) can help.
• Headache: Often resolves after the first few weeks.
• Dizziness: Particularly when standing up quickly. Staying hydrated and rising slowly can help.
• Dry mouth: Staying hydrated and using sugarless gum or candies can help.
• Increased sweating: A common SSRI effect, particularly at higher doses.
• Fatigue: Often improves over time. If persistent, mention it to your provider.

Sexual Side Effects

Sexual dysfunction is one of the most common reasons patients discontinue escitalopram. Effects can include:

• Decreased libido (reduced sex drive)
• Delayed orgasm or difficulty achieving orgasm
• Erectile dysfunction in men

Research suggests sexual dysfunction affects 25-40% of escitalopram users to some degree. This is important to discuss with your provider — options include dose reduction, adding a medication to counteract the effect, switching to a different antidepressant (bupropion has fewer sexual side effects), or simply waiting to see if the effect improves over time.

In rare cases, sexual dysfunction may persist even after stopping escitalopram — a condition known as Post-SSRI Sexual Dysfunction (PSSD). This risk has led the European Medicines Agency and Health Canada to recommend that Lexapro's label warn about this possibility.

Serious Side Effects — Call Your Doctor Right Away

These side effects are less common but require prompt medical attention:

• Serotonin syndrome: A potentially life-threatening condition caused by too much serotonin. Symptoms include agitation, confusion, rapid heart rate, high blood pressure, dilated pupils, muscle twitching or rigidity, and high fever. More likely when escitalopram is combined with other serotonergic drugs. Seek emergency care immediately.
• QT prolongation: Escitalopram can rarely prolong the QT interval on an ECG, which can increase the risk of an abnormal heart rhythm. This risk is higher at 20 mg (the maximum approved dose) and when combined with other QT-prolonging drugs.
• Hyponatremia (low sodium): More common in older adults taking SSRIs. Symptoms include headache, difficulty concentrating, confusion, weakness, and seizures in severe cases.
• Increased bleeding: SSRIs affect platelet function. Risk increases when combined with NSAIDs (ibuprofen, naproxen), aspirin, or blood thinners.
• Activation of mania or hypomania: Patients with undiagnosed or poorly controlled bipolar disorder may experience a manic switch. Unusual elevated mood, decreased need for sleep, and impulsive behavior warrant an immediate call to your provider.

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Weight Changes

Escitalopram is associated with modest weight gain in some patients. Research suggests average weight gain of approximately 1-4% of body weight over time. The mechanism is thought to involve escitalopram's effects on serotonin, appetite regulation, and metabolism. Weight gain is generally not immediate — it tends to develop over months of treatment.

Discontinuation Symptoms: What Happens When You Stop

Stopping escitalopram abruptly can cause a withdrawal-like syndrome including dizziness, nausea, irritability, "brain zaps" (electric shock sensations), vivid dreams, and flu-like symptoms. These are not signs of addiction — they reflect the body readjusting to lower serotonin availability. Always taper escitalopram slowly under your provider's guidance.

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When to Call Your Doctor

Call your provider promptly if you experience suicidal thoughts, symptoms of serotonin syndrome, signs of mania, or unusual bleeding. For guidance on medications and supplements to avoid while taking escitalopram, see our guide on Escitalopram Drug Interactions.