Lexapro Side Effects: What Fades, What Lingers, What to Do

“When side effects start, you’re on your own until the next appointment.” If that’s how your first week on Lexapro feels, you’re far from alone. Lexapro (escitalopram) works with real precision: it blocks the serotonin transporter so more serotonin stays available, and the FDA prescribing information describes it as highly selective, with little or no pull on the histamine, muscarinic, and adrenergic receptors linked to sedation and other side effects of some older psychiatric drugs. So the side effects that do show up tend to cluster in three places: your stomach, your sleep, and your sex life.

Escitalopram earned its spot as a common first choice. A 2018 network meta-analysis of 522 trials and 116,477 adults found it was among the more effective antidepressants in head-to-head comparisons and among the more tolerable, with lower dropout rates than many alternatives. The results are real, and the science is well established.

But trial averages can’t tell you what your second week will feel like, and at Siggy we’d rather give you the real numbers and a plan than a list to worry over.

This guide covers how often each side effect happens compared with placebo, when early ones usually fade, why dose matters, which effects tend to linger, and when to get help. A frightening package insert and a measured risk are two very different things, and the difference comes straight from the evidence.

What This Page Covers

• What Are the Most Common Lexapro Side Effects?
• When Do Lexapro Side Effects Start and Stop?
• Does a Higher Lexapro Dose Mean More Side Effects?
• Which Lexapro Side Effects Tend to Linger?
• How Can You Manage Lexapro Side Effects?
• Which Lexapro Side Effects Need Urgent Care?
• What Happens If You Stop Lexapro Suddenly?
• Get Support While Your Body Adjusts

What Are the Most Common Lexapro Side Effects?

The package insert lists dozens of effects, which makes it easy to miss the most useful detail: how often each one happened on Lexapro compared with a sugar pill. Here are the most common side effects among 715 adults taking Lexapro and 592 taking placebo in the FDA depression trials, from the prescribing information linked above.

Side Effect	Lexapro	Placebo
Nausea	15%	7%
Insomnia	9%	4%
Delayed ejaculation (men)	9%	Under 1%
Diarrhea	8%	5%
Sleepiness	6%	2%
Fatigue	5%	2%
Increased sweating	5%	2%

Two things stand out. First, even the most common side effect, nausea, affected about 1 in 7 people, so no single effect is a given. Second, placebo rates are higher than many people expect, which means some of what you feel in week one may be stress, depression, or anxiety rather than the pill. In the anxiety trials, headache was reported by 24% of people on Lexapro and 17% on placebo.

Among adults with depression, 6% stopped Lexapro because of a side effect, compared with 2% on placebo. The side effects most clearly linked to stopping were nausea and ejaculation problems.

When Do Lexapro Side Effects Start and Stop?

Most side effects show up early, often in the first days, while mood benefits usually take longer to arrive. NHS escitalopram guidance says most side effects should ease after a couple of weeks as your body gets used to the medicine, though some last longer.

Here’s a reframe worth holding onto. In one 211-patient trial of people starting escitalopram or duloxetine for depression, those who had any side effect in the first two weeks were more likely to finish the 12-week study (86.7% vs 73.7%). The researchers suggested that regular, direct questions about side effects may have helped people feel like partners in their care. An early side effect is information to share, and it doesn’t mean the medication is failing you.

Benefits take a little longer. The FDA label notes that people may notice improvement in 1 to 4 weeks and should keep taking the medication as directed. Lexapro reaches steady levels in your blood in about one week. Its half-life is roughly 27 to 32 hours, which means your body takes more than a day to clear half of a dose.

Does a Higher Lexapro Dose Mean More Side Effects?

Yes, and this is one of the most practical facts in the label. In two fixed-dose depression trials, 66% of people on 10 mg reported any side effect, close to the 61% on placebo. At 20 mg, that rose to 86%. Insomnia and diarrhea each hit 14% at 20 mg, roughly double the 10 mg rates. Discontinuation for side effects was 10% at 20 mg, compared with 4% at 10 mg and 3% on placebo.

The FDA label also notes that a fixed-dose depression trial did not show greater benefit at 20 mg than at 10 mg, and it lists 10 mg as the recommended dose for adults. That’s one reason prescribers often start low and adjust slowly. Our guide to how doctors choose a Lexapro dose walks through that decision.

Which Lexapro Side Effects Tend to Linger?

Stomach upset usually fades. A few effects are more stubborn, and they’re also the ones people are least likely to mention.

Sexual Side Effects

The FDA label says its own sexual side effect numbers likely underestimate the real rate, partly because patients and clinicians are reluctant to bring them up. When researchers ask directly with questionnaires, the picture changes. A 2009 meta-analysis found that treatment-emergent sexual dysfunction ranged from 25.8% to 80.3% across antidepressants, and escitalopram was among those with rates significantly higher than placebo.

Common changes include lower desire, delayed orgasm or ejaculation, and erection difficulty. You can raise this with your prescriber the same way you’d raise nausea. Our post on Lexapro and sex drive covers it in more depth.

Emotional Blunting

Some people describe feeling flat, as if both lows and highs got turned down. In an Oxford-led survey of 669 people taking antidepressants, 46% reported emotional blunting. Blunting scores also tracked with depression symptoms, so part of that flatness may be depression that hasn’t fully lifted. Either way, it’s worth reporting so your prescriber can help sort out whether the medication, lingering depression, or both are behind it. This was a self-report survey, so treat the 46% as a rough signal.

Weight Changes

In the 8-week FDA trials, weight didn’t differ meaningfully from placebo. Longer follow-up tells a slightly different story. A 2024 Annals study of 183,118 patients found that people starting escitalopram gained about 0.4 kg (just under a pound) more over six months than people starting sertraline, with a 10% to 15% higher risk of gaining at least 5% of their body weight. That’s a real but modest difference. Our guide to Lexapro and weight gain covers what to watch.

How Can You Manage Lexapro Side Effects?

Most fixes are simple, and all of them work better when your prescriber knows what’s happening. NHS guidance notes that starting at a low dose and increasing it after a few weeks reduces the chances of side effects.

• Track what you notice. Write down the symptom, when it started, and how much it affects your day. Patterns are easier to act on than impressions.
• Adjust timing with your prescriber. Lexapro can be taken morning or evening, with or without food, so your prescriber may suggest moving your dose if you’re dealing with insomnia or daytime sleepiness.
• Avoid alcohol, which the FDA label does not recommend with Lexapro. Our post on drinking alcohol on Lexapro explains why.
• Ask about targeted options for sexual side effects. A Cochrane review found that adding sildenafil or tadalafil improved antidepressant-related erectile problems in men, and higher-dose bupropion was the most promising option studied in women, though the evidence is limited.
• Give dose changes time. In the 211-patient trial, only about 45% of side effects that led to a dose reduction resolved within 30 days, so a check-in after a change is worth scheduling.

Don’t change your dose or skip doses on your own. A side effect is a reason to call, not a reason to quit.

Which Lexapro Side Effects Need Urgent Care?

Serious reactions are uncommon, but the FDA label flags several you should know.

• Antidepressants carry a boxed warning for increased suicidal thinking in children, teens, and young adults under 25, especially early in treatment or after dose changes. New agitation, panic, or sudden mood changes deserve a call at any age.
• Serotonin syndrome can cause agitation, confusion, a racing heart, sweating, fever, stiff or twitching muscles, and vomiting. The risk is highest when Lexapro is combined with other serotonergic drugs such as triptans, tramadol, or St. John’s wort.
• Bleeding risk rises when Lexapro is taken with aspirin, NSAIDs such as ibuprofen, or warfarin.
• Low sodium can cause headache, confusion, weakness, and unsteadiness, and older adults face greater risk.
• Eye pain or vision changes can signal angle-closure glaucoma in people with narrow eye angles.
• Mania can show up as racing thoughts, very little need for sleep, and unusually high energy. It happened in 0.1% of people in the depression trials.

If you have trouble breathing, swelling of the face or throat, a seizure, or signs of serotonin syndrome, call 911. For any of the others, contact your prescriber promptly.

What Happens If You Stop Lexapro Suddenly?

Feeling better is a good reason to talk about your plan and a poor reason to stop on your own. The FDA label lists discontinuation symptoms that include dizziness, irritability, anxiety, headache, insomnia, and electric shock sensations, often called brain zaps, and it recommends gradual dose reduction whenever possible.

A 2024 Lancet Psychiatry meta-analysis of 79 studies found that 31% of people stopping an antidepressant had at least one discontinuation symptom, compared with 17% stopping placebo. After accounting for that placebo effect, the authors estimated a true rate of about 15%, or one in six to seven people. Severe symptoms affected 2.8%. Escitalopram was among the drugs linked to more frequent symptoms. Our guides to Lexapro withdrawal and how to taper off Lexapro cover the process step by step.

This article is for education only and isn’t a substitute for personal medical advice. It reflects sources available as of October 2026. If you’re having thoughts of suicide or feel unsafe, call or text 988. In an emergency, call 911.

Get Support While Your Body Adjusts

Staying on an antidepressant is harder than it sounds. In the 2024 Annals study above, only 28% to 41% of people stayed on their antidepressant for six months, depending on the drug. Most side effects in this guide are common, measurable, and manageable, and the ones that linger usually have options, from timing and dose changes to adjusting your antidepressant without starting over. If you’re weighing Lexapro or already struggling with it, start your anonymous intake with Siggy. It’s free, asks for no name or email, and gives you a downloadable summary you can share with any clinician. If medication makes sense for you, a licensed prescriber reviews your full clinical picture before anything is prescribed, so side effects get weighed against your goals from day one. You deserve a care team that checks in on how your medication is actually working for you.