Understanding Lexapro Side Effects

Lexapro (escitalopram) is a commonly prescribed selective serotonin reuptake inhibitor (SSRI) used to treat depression and anxiety. Like all medications, it can cause side effects. Two concerns sometimes raised are serotonin syndrome and heart-related problems. This guide explains what you need to know in clear, straightforward language.

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What Is Lexapro?

Lexapro works by increasing levels of serotonin—a brain chemical that affects mood. Most people tolerate it well, but side effects can occur, especially when starting treatment or changing doses.

Key points about Lexapro:

• Approved for major depressive disorder and generalized anxiety disorder.
• Usually starts at a low dose (e.g., 5–10 mg daily) and may increase under medical supervision.
• May take 4–6 weeks to see full benefits.

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Common Lexapro Side Effects

Most side effects are mild and often improve after a week or two. Common reactions include:

• Nausea
• Headache
• Drowsiness or fatigue
• Dry mouth
• Insomnia or vivid dreams
• Increased sweating
• Sexual side effects (decreased libido, delayed orgasm)

If these persist or interfere with daily life, talk with your doctor about adjusting the dose or timing.

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Can Lexapro Cause Serotonin Syndrome?

What Is Serotonin Syndrome?

Serotonin syndrome is a rare but potentially serious reaction from too much serotonin. It most often happens if you combine Lexapro with other medications or supplements that boost serotonin.

Risk Factors

• Taking multiple serotonergic drugs (e.g., other SSRIs, SNRIs, triptans, MAO inhibitors).
• Using certain herbal supplements (e.g., St. John’s wort, tryptophan).
• Rapidly increasing the Lexapro dose before your body adjusts.

Symptoms of Serotonin Syndrome

Watch for a combination of:

• Agitation or restlessness
• Confusion or disorientation
• Rapid heart rate and high blood pressure
• Dilated pupils
• Tremor or muscle rigidity
• Sweating, shivering, or goosebumps
• Severe cases: high fever, seizures, unconsciousness

What to Do

• If you notice mild symptoms, contact your healthcare provider immediately.
• For severe signs (high fever, loss of coordination, seizures), seek emergency medical care.
• Stopping the offending drugs and supportive treatment in a hospital usually resolves the syndrome.

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Can Lexapro Cause Dangerous Heart Problems?

QT Prolongation and Arrhythmias

Lexapro has been associated—albeit rarely—with changes in the heart’s electrical activity, specifically QT interval prolongation. A prolonged QT interval can sometimes lead to torsades de pointes, a potentially life-threatening arrhythmia.

Who’s at Higher Risk?

• People with existing heart conditions (e.g., heart failure, bradycardia).
• Electrolyte imbalances (low potassium or magnesium).
• Taking other medications known to affect QT interval (e.g., certain antipsychotics, other antidepressants, some antibiotics).
• Older adults, especially those over 65.

Warning Signs

Be alert for:

• Palpitations (feeling your heart skip beats or flutter).
• Fainting or feeling lightheaded.
• Chest discomfort.
• Shortness of breath.

Reducing Your Risk

• Your doctor may perform an electrocardiogram (ECG) before or during treatment.
• Maintain healthy electrolyte levels—eat a balanced diet and stay hydrated.
• Share a complete list of your medications (including over-the-counter drugs and supplements) with your provider.
• Never change doses or stop Lexapro without medical advice.

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Monitoring and Preventing Problems

Preventing serious side effects involves:

• Regular check-ins: Schedule follow-up visits or calls.
• Symptom tracking: Keep a daily log of mood changes, side effects, and any new symptoms.
• Medication review: Update your doctor on any new prescriptions or supplements.
• Lifestyle measures: Exercise, balanced nutrition, and adequate sleep can support your treatment.

You might also consider a free, online symptom check, using the doctor approved Ubie Symptom Checker to help track any concerning symptoms before they become serious.

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When to Seek Medical Help

Immediate Attention

Call emergency services or go to the nearest emergency department if you experience:

• Sudden high fever, seizures, or loss of consciousness (possible serotonin syndrome).
• Uncontrolled shaking or muscle rigidity.
• Severe chest pain or fainting (possible arrhythmia).
• Thoughts of harming yourself or others (acute psychiatric emergency).

Talk to Your Doctor

Discuss promptly with your healthcare provider if you notice:

• New or worsening palpitations or lightheadedness.
• Persistent tremors, restlessness, or confusion.
• Any side effect that disrupts daily life or causes concern.

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Balancing Benefits and Risks

Lexapro can be life-changing for many people, significantly reducing symptoms of depression and anxiety. While no medication is entirely without risk, serious complications like serotonin syndrome or dangerous heart issues are uncommon when you:

• Follow the prescribed dose and schedule.
• Communicate openly with your healthcare team.
• Stay vigilant for warning signs.

Ultimately, making informed decisions with your doctor ensures you get the most benefit with the least risk.

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Disclaimer: This information does not replace professional medical advice. Always speak to a doctor about any life-threatening or serious symptoms, or before making changes to your medication regimen.