Lexapro (escitalopram) typically takes 1 to 2 weeks before you notice any changes, and 6 to 8 weeks to reach its full effect. The first few weeks are the adjustment period, and knowing what’s normal during that time can make a real difference in whether you stick with it long enough for it to work.
How Lexapro Works
Lexapro belongs to a class of medications that increase serotonin levels in your brain. Normally, after serotonin sends a signal between nerve cells, it gets reabsorbed. Lexapro blocks that reabsorption, so more serotonin stays available to keep signaling. What makes escitalopram somewhat unusual among its class is that it binds to two sites on the serotonin transporter at once, which slows down how quickly it detaches. This is thought to be one reason it works well at relatively low doses.
Even though serotonin levels start rising within hours of your first pill, your brain needs time to adapt to this new chemical environment. That gap between “the drug is doing something” and “I feel better” is why the first few weeks can feel frustrating.
The First One to Two Weeks
Most people start at 10 mg once daily, whether they’re taking it for depression or generalized anxiety. Side effects tend to show up before the benefits do. During the first week, the most commonly reported issues are nausea, diarrhea, drowsiness, dry mouth, decreased appetite, increased sweating, indigestion, and changes in sleep. These are typically mild at the starting dose, and for most people they fade as the body adjusts.
The earliest signs that the medication is starting to work are often indirect. You might notice your sleep improving, your energy picking up slightly, or your appetite returning to something more normal. These changes can appear within the first one to two weeks, often before your mood itself shifts. It’s worth paying attention to these early signals because they’re easy to miss if you’re focused on waiting for a dramatic change in how you feel emotionally.
Weeks Two Through Eight
The core symptoms of depression or anxiety, like persistent low mood, loss of interest in things you used to enjoy, or chronic worry, typically take 6 to 8 weeks to fully improve. This is the hardest part for many people: the side effects are fading, but the full benefits haven’t arrived yet. It can feel like the medication isn’t doing anything.
If you’re tracking your progress, look for gradual shifts rather than a single turning point. You might realize you had a good afternoon without noticing it at the time, or that something that would have sent you spiraling last month only bothered you briefly. The change tends to be cumulative and subtle rather than a switch flipping.
Timing Your Dose
You can take Lexapro in the morning or at night. There’s no single best time, but your body’s response should guide the decision. If Lexapro makes you drowsy, taking it before bed makes sense. If it disrupts your sleep, try switching to mornings. The drug reaches its peak concentration in your blood about 5 hours after you take it, so morning dosing gives that peak time to pass well before bedtime. Whatever time you choose, consistency matters more than the specific hour.
Sexual Side Effects and Weight Changes
Product labels for SSRIs like Lexapro list sexual side effects at under 15%, but that number significantly understates reality. When patients are asked directly, between 30% and 60% report some form of sexual difficulty, and some studies put the number as high as 70%. This can include reduced desire, difficulty with arousal, or trouble reaching orgasm. These effects don’t always appear in the first week. They may develop gradually over weeks or months of treatment.
Weight gain is less common but not rare. Roughly 5% to 10% of people on antidepressants gain a significant amount of weight, defined as 7% or more of their body weight. This tends to be a longer-term issue rather than something that happens in the first few weeks. If you notice steady weight changes over several months, it’s worth bringing up with your prescriber, since there are strategies to manage it or alternatives to consider.
Substances to Avoid
A few common substances interact with Lexapro in ways that matter. St. John’s Wort, a popular herbal supplement for mood, is the most important one to avoid. Combining it with Lexapro can cause a dangerous buildup of serotonin called serotonin syndrome, which can produce confusion, seizures, rapid heart rate, fever, and in severe cases, coma. This isn’t a mild interaction.
Over-the-counter pain relievers like ibuprofen and aspirin also deserve caution. SSRIs affect how your platelets function, and combining them with anti-inflammatory painkillers increases bleeding risk. This doesn’t mean you can never take ibuprofen, but it’s something to discuss with whoever prescribed your Lexapro, especially if you use these painkillers regularly. Alcohol, while not strictly prohibited, can worsen both the side effects of Lexapro and the symptoms you’re treating.
A Note on Suicidal Thoughts in Young Adults
All antidepressants, including Lexapro, carry an FDA boxed warning about increased risk of suicidal thinking and behavior in children and adolescents. A combined analysis of clinical trials found that 4% of young people taking antidepressants experienced suicidal thoughts, compared to 2% on placebo. This risk is highest during the first few months of treatment. If you’re under 25 or you’re a parent of someone starting this medication, close monitoring during the early weeks is important. Any new or worsening thoughts of self-harm should be reported to your prescriber immediately.
What Happens If You Stop
Lexapro should not be stopped abruptly. Discontinuation syndrome is a real phenomenon that can produce dizziness, flu-like symptoms, nausea, diarrhea, and strange sensations sometimes described as “brain zaps,” a feeling like a brief electric jolt in your head. Mood symptoms can also rebound, including agitation, irritability, anxiety, and confusion.
The standard approach is to reduce your dose gradually over weeks to months, with two to six weeks between each reduction. People who stop quickly, within a week or less, are more likely to relapse within a few months compared to those who taper slowly. This is true even if you feel great and are confident you no longer need the medication. Tapering is one of those situations where patience genuinely prevents suffering.