Lexapro (escitalopram) is one of the most widely prescribed antidepressants in the United States and is generally considered safe for most adults when taken as directed. Approved by the FDA in 2002 for major depressive disorder and generalized anxiety disorder, it has over two decades of clinical use behind it. That said, “safe” doesn’t mean “without risks,” and the specifics matter depending on your age, other medications, and how long you plan to take it.
Common Side Effects and How Often They Occur
Most people who take Lexapro experience mild side effects, especially in the first few weeks. Nausea is the most frequently reported, followed by headache, insomnia, drowsiness, and increased sweating. Sexual side effects, including reduced desire and difficulty reaching orgasm, are also common and tend to persist longer than other side effects.
These side effects are typically dose-dependent, meaning they’re more likely at higher doses. The standard starting dose is 10 mg once daily, and the maximum recommended dose for healthy adults is 20 mg. For older adults and people with liver problems, 10 mg is the recommended ceiling. Many people find that initial side effects like nausea and headaches fade within the first two to four weeks as the body adjusts.
The FDA’s Boxed Warning on Suicide Risk
Lexapro carries the FDA’s most serious label warning: a boxed warning about increased risk of suicidal thoughts and behaviors in children, adolescents, and young adults under 25. This warning applies to all antidepressants, not just Lexapro. It came from a pooled analysis of roughly 77,000 adult patients and 4,500 pediatric patients across placebo-controlled trials, which found that younger patients on antidepressants had higher rates of suicidal thinking than those on placebo.
This doesn’t mean the medication causes suicide. It means that during the early weeks of treatment, some young people experience a paradoxical increase in agitation or dark thoughts before the antidepressant effect kicks in. Close monitoring during the first few months is standard practice, especially for anyone under 25. Lexapro is approved for adolescents aged 12 to 17 for depression, but not for anxiety in that age group.
Serotonin Syndrome: Rare but Serious
Lexapro works by increasing serotonin levels in the brain. In rare cases, too much serotonin can trigger a dangerous condition called serotonin syndrome. Symptoms include rapid heart rate, high blood pressure, muscle rigidity, agitation, confusion, and in severe cases, dangerously high body temperature and seizures.
Serotonin syndrome almost never happens from Lexapro alone at normal doses. The real danger comes from combining it with other drugs that also raise serotonin levels. The most dangerous combination is with MAOIs, a class of older antidepressants that should never be taken alongside Lexapro. Other risky combinations include certain migraine medications (triptans), the pain reliever tramadol, the herbal supplement St. John’s wort, and some anti-nausea medications. If you’re taking Lexapro, make sure every prescriber and pharmacist you see knows about it.
Effects on Heart Rhythm
Lexapro can cause a slight prolongation of the QT interval, which is a measure of how long your heart takes to reset between beats. A significantly prolonged QT interval raises the risk of abnormal heart rhythms. The good news: research has shown that escitalopram causes substantially less QT prolongation than its close relative citalopram (Celexa), and the effect was only clinically meaningful at supratherapeutic doses of 30 mg daily, well above the 20 mg maximum.
For most healthy adults taking 10 to 20 mg, heart rhythm changes are not a practical concern. People who already have heart rhythm disorders, low potassium or magnesium levels, or who take other medications that affect QT interval should be more cautious.
What Long-Term Use Looks Like
Many people take Lexapro for years, and long-term safety data is reassuring. In extended studies of escitalopram for generalized anxiety disorder, the average weight gain was about 3 pounds. No clinically significant changes in blood work, blood pressure, or heart rhythm were observed over the study period. This makes Lexapro relatively weight-neutral compared to some other antidepressants, though individual experiences vary.
One concern that gets less attention is what happens when you stop. Lexapro, like all SSRIs, can cause discontinuation syndrome if you quit abruptly. This isn’t addiction in the traditional sense, but your brain does adjust to the presence of the drug, and removing it suddenly can cause a cluster of uncomfortable symptoms.
Stopping Lexapro Safely
Discontinuation symptoms can start within days of stopping and include dizziness, nausea, muscle tension, irritability, insomnia, vivid dreams, and a sensation often described as “brain zaps,” brief electrical-shock-like feelings in the head. Some people also experience mood swings, anxiety, and difficulty concentrating. These symptoms range from mildly annoying to genuinely disruptive.
The best way to avoid this is a gradual taper rather than stopping cold turkey. There’s no universal timeline for tapering. Some people can reduce their dose over a few weeks, while others, particularly those who’ve been on Lexapro for years, may need a slower reduction over months. The key is to work with a prescriber to set a tapering schedule that matches your situation, and to adjust the pace if symptoms become too uncomfortable.
Who Should Be More Cautious
Lexapro is safe for most people, but certain groups need closer monitoring or adjusted doses:
- Adolescents under 18: Only approved for depression (not anxiety) in ages 12 to 17, with the boxed warning about suicidal thoughts applying most strongly here.
- Young adults under 25: Also covered by the boxed warning during early treatment.
- Older adults: The recommended dose stays at 10 mg because the drug is cleared from the body more slowly with age.
- People with liver problems: Also capped at 10 mg, since the liver is responsible for breaking down the medication.
- Pregnant or breastfeeding women: Lexapro crosses the placenta and enters breast milk. The decision to use it during pregnancy involves weighing the risks of untreated depression against potential effects on the baby.
Overall, Lexapro has a well-established safety profile and is considered one of the better-tolerated antidepressants available. Most side effects are mild and temporary, serious complications are rare, and the drug has been studied extensively over more than 20 years. The biggest practical safety issues for most people are managing side effects early on, being careful about drug interactions, and tapering gradually if they decide to stop.