Lexapro Side Effects First Week: Symptoms, Duration, and When to Worry

perhaps more urgently, Why do I feel worse after starting Lexapro?

If you’re asking these questions, you’re not alone. The initial adjustment period for any antidepressant can be a bumpy ride. Your body and brain are getting used to a new chemical process, and that can come with some temporary, and sometimes uncomfortable, changes.

what to expect when starting Lexapro,

First, a quick primer: Lexapro is a selective serotonin reuptake inhibitor, or SSRI. In simple terms, it works by increasing the levels of serotonin—a natural “feel-good” chemical—in your brain. This adjustment doesn’t happen overnight, which is why the first week can feel so strange.

Think of it like your brain is recalibrating. This process is what leads to the initial side effects, but it’s also the very thing that will ultimately help alleviate symptoms of depression and anxiety.

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What side effects should I expect during my first week of Lexapro?

The initial lexapro side effects first week are often the most noticeable. While many people experience only mild effects or none at all, it’s helpful to know what’s considered normal. Here are some of the most common side effects of escitalopram you might encounter as your body adjusts.

Digestive Issues: The “Gut-Brain” Connection

Did you know a large amount of your body’s serotonin is actually in your gut? Source. This is why digestive issues are so common when starting an SSRI.

• Nausea: This is arguably the most frequently reported side effect. You might experience a general queasiness or upset stomach, particularly after taking your dose. This is a classic example of lexapro nausea.
• Diarrhea or Constipation: Your digestive system might speed up or slow down temporarily.
• Dry Mouth: A persistent, cotton-ball feeling in your mouth is common.

Sleep Changes: Too Tired or Too Wired

Serotonin plays a key role in regulating your sleep-wake cycle. When you introduce Lexapro, it can throw this cycle off-balance for a little while.

• Insomnia: You might find it difficult to fall asleep or stay asleep, even if you feel tired. This is a common complaint of lexapro insomnia.
• Drowsiness/Fatigue: On the flip side, you might feel unusually sleepy, groggy, or drained of energy. This lexapro tiredness/fatigue can make it hard to get through the day.

Emotional & Mental Shifts: The “It Gets Worse Before It Gets Better” Feeling

This is often the most unsettling part of starting Lexapro. You’re taking a medication to feel less anxious, so why does it feel like your anxiety is spiking?

• Increased Anxiety: A temporary, paradoxical increase in anxiety is a well-known phenomenon. The lexapro and anxiety first week experience can feel like a step backward, with heightened restlessness, agitation, or a “jittery” feeling. This is a direct result of your brain adjusting to the new serotonin levels. This addresses the common question, “Does lexapro make you feel worse at first?” For some, the answer is a temporary “yes.”
• Feeling “Off” or Foggy: You might not feel like yourself. Some people describe a sense of emotional blunting or just a general weirdness.

Physical Symptoms

• Headaches: Mild to moderate headaches are common as your body chemistry shifts.
• Increased Sweating: You might notice you’re sweating more than usual, especially at night.
• Dizziness: Feeling a bit lightheaded or dizzy can also occur.

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How Long Do Initial Lexapro Side Effects Last?

Here’s the good news. For the vast majority of people, the most noticeable escitalopram side effects first week are temporary.

Your body is incredibly adaptive. As it gets used to the medication, these initial side effects typically begin to fade significantly within the first 7 to 14 days. The nausea subsides, your sleep patterns start to regulate, and that jarring feeling of increased anxiety begins to calm down.

So, how long do lexapro side effects last? While the initial wave usually passes within two weeks, some side effects, such as sexual side effects (like decreased libido or difficulty with orgasm), can persist longer for some individuals. If any side effect continues to bother you after the first few weeks, it’s a conversation worth having with your healthcare provider.

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The Big Question: When Will I Start to Feel Better?

You’re enduring the side effects for one reason: to feel better. So, when does Lexapro start working? Understanding the timeline is crucial for managing your expectations and sticking with the treatment.

• Weeks 1-2: Subtle Shifts. While you’re navigating the initial side effects, you might start noticing small, positive changes. These often aren’t related to your core mood but to physical symptoms. You may find your sleep quality improving, your appetite returning, or a slight increase in your energy levels. Hang on to these early wins!
• Weeks 4-8: The Full Therapeutic Effect. This is the main event. It typically takes 4 to 8 weeks for Lexapro to build up in your system and exert its full effect on your mood and anxiety. Source. This is when you’ll likely feel a significant reduction in depressive symptoms or the constant hum of anxiety. Patience is your superpower here.

Your doctor will likely start you on a low dose (e.g., 5 mg or 10 mg) to help your body acclimate and minimize side effects before potentially increasing it to a more therapeutic level.

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Serious Side Effects: When to Call Your Doctor Immediately

While most initial effects are manageable and temporary, it’s vital to know the warning signs of rare but serious side effects of Lexapro. Seek immediate medical help if you experience any of the following.

FDA Boxed Warning: Suicidal Thoughts and Behaviors

The FDA has issued its most serious type of warning, a “black box warning,” for all antidepressant medications.

• What it is: There is an increased risk of suicidal thoughts and behaviors, particularly in children, adolescents, and young adults (under the age of 25). Source.
• What to watch for: Any new or sudden worsening of depression, thoughts of self-harm, unusual changes in behavior, agitation, or hostility—especially in the first few weeks of treatment or after a dose change.
• What to do: If you or someone you know is having these thoughts, contact your doctor immediately. You can also connect with people who can support you by calling or texting 988 anytime in the US to reach the Suicide & Crisis Lifeline.

Serotonin Syndrome

This is a rare but potentially life-threatening condition caused by too much serotonin in the brain. It most often occurs when combining medications that affect serotonin.

• Symptoms: Look for a combination of symptoms like agitation or restlessness, confusion, rapid heart rate, high blood pressure, dilated pupils, muscle rigidity or twitching, heavy sweating, and diarrhea. Source.
• What to do: Seek emergency medical attention immediately if you suspect serotonin syndrome.

Allergic Reactions

As with any medication, a severe allergic reaction is possible.

• Symptoms: Hives, rash, swelling of the face, tongue, or throat, and severe difficulty breathing.
• What to do: This is a medical emergency. Call 911.

Other Red Flags

Contact your doctor right away if you experience: * Activation of mania or hypomania (symptoms include extreme energy, racing thoughts, risky behavior, and decreased need for sleep) * Seizures * Unusual bleeding or bruising

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Practical Tips for Coping With First-Week Side Effects

Knowing what to expect is half the battle. The other half is having a toolkit for managing the discomfort. Here are some simple, actionable strategies for coping with Lexapro side effects during that initial adjustment.

• For Nausea: Take your pill with a meal or a small snack. Avoid taking it on an empty stomach. Ginger tea or ginger chews can also help settle your stomach.
• For Drowsiness/Fatigue: If Lexapro makes you sleepy, talk to your doctor about taking your dose in the evening before bed.
• For Insomnia: If you find the medication energizing, ask your doctor if taking it first thing in the morning is a better option for you.
• For Dry Mouth: Keep a water bottle handy and sip throughout the day. Chewing sugar-free gum or sucking on sugar-free hard candies or ice chips can also stimulate saliva production.
• For Headaches: A simple over-the-counter pain reliever like ibuprofen or acetaminophen can help, but check with your doctor first to ensure it’s safe for you.
• General Well-being:
  • Stay Hydrated: Dehydration can make headaches and dizziness worse.
  • Maintain a Routine: Stick to regular sleep, meal, and work schedules as much as possible to give your body a sense of stability.
  • Gentle Movement: A short walk can help with restlessness and boost your mood without being over-stimulating.
  • Avoid Alcohol: Alcohol is a depressant and can interfere with Lexapro’s effectiveness and worsen side effects like drowsiness and dizziness.

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Your First Week is a Bridge, Not a Destination

The lexapro side effects first week can be challenging, but it’s crucial to see it for what it is: a temporary adjustment period. Your body is building a bridge to a place with less anxiety and a brighter mood. The initial discomforts are the scaffolding for that bridge.

Remember the key takeaways: initial side effects are normal and usually fade within a week or two. The full, life-changing benefits for your mood often take a month or two to emerge.

Most importantly, stay in close communication with your healthcare provider. They are your partner in this process. Report any side effects you’re experiencing, and never be afraid to ask questions.

And finally, a crucial call to action: Do not stop taking Lexapro abruptly. Suddenly stopping can lead to withdrawal symptoms, sometimes called discontinuation syndrome (dizziness, irritability, nausea, brain “zaps”). Always consult your doctor to create a safe plan for tapering off the medication if it becomes necessary.

You’ve taken a courageous step toward better mental health. Be patient and kind to yourself during this first week. You’ve got this.

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Disclaimer: This article is for informational purposes only and does not constitute medical advice. The information contained herein is not a substitute for and should never be relied upon for professional medical advice. Always talk to your doctor about the risks and benefits of any treatment.