--- title: Escitalopram side effects: what to expect and watch for description: Escitalopram can cause nausea, sleep changes, sexual side effects and mood shifts. Here's what's common, how long it lasts, and when to see a doctor. url: https://niyora.com/treatments/escitalopram-side-effects/ --- - [Niyora](https://niyora.com/) - [Treatments](https://niyora.com/treatments/) - Escitalopram side effects, including mood Treatment # Escitalopram side effects, including mood Escitalopram's most common side effects are nausea, sleep changes, dry mouth and sexual side effects, usually mildest after the first few weeks. Mood can shift in either direction: some women notice less premenstrual irritability, others feel flat or more anxious early on. Most physical side effects ease within a month; call a doctor sooner if your mood feels worse than before you started. Updated 14 October 2026 Niyora editorial Moderate evidence Strength of evidence Moderate Good studies point the same way, with some gaps. - None - Limited - Mixed - Moderate - Strong ## At a glance - Escitalopram's most common side effects, nausea, sleep changes, dry mouth and sexual side effects, usually show up in the first two weeks and ease after that. - In a small crossover trial of 27 women, escitalopram taken only in the luteal phase reduced premenstrual irritability and anger compared with placebo. - Mood side effects can run the other way too: emotional flatness, new anxiety or agitation are possible, especially in the first couple of weeks. - Weight change with escitalopram is possible but inconsistent, and tends to show up later rather than early on. - Call your prescriber the same day if your mood feels worse than before you started, or you have thoughts of harming yourself. ## Strength of evidence Moderate evidence - None - Limited - Mixed - Moderate - Strong One small randomized crossover trial (n=27, 2025) found escitalopram reduced premenstrual irritability and anger more than placebo when dosed only in the luteal phase. Its broader side effect profile reflects general SSRI prescribing information, not a specific trial cited here. ## What are the side effects of escitalopram? Escitalopram (sold as Lexapro) raises serotonin levels, and most of its side effects come from that same mechanism. They're usually mildest in the first week or two and ease as your body adjusts. Common side effects include: - Nausea or an upset stomach - Headache - Dry mouth - Sleepiness during the day, or trouble falling asleep - Sweating more than usual - Sexual side effects: lower desire, delayed orgasm, or both Less common ones include dizziness, tremor, and a dip in appetite. Some people get diarrhea, others get constipated. A smaller number notice yawning spells or unusually vivid dreams, which aren't dangerous, just odd. Most people tolerate escitalopram well enough to keep taking it, and **side effects that start in week one often fade on their own**. If nausea or sleep problems are severe, or haven't improved after three or four weeks, tell the doctor who prescribed it rather than stopping on your own. ## Can escitalopram affect your mood? Yes, in both directions. For premenstrual irritability and anger, a small 2025 crossover trial of 27 women found that taking escitalopram only in the luteal phase reduced self-rated irritability and anger compared with placebo [2]. Some women feel steadier within one treated cycle. Escitalopram can also cause mood side effects, especially in the first one to two weeks. These can include: - Feeling emotionally flat or less reactive than usual - New or worse anxiety or restlessness - Agitation or trouble sitting still People under 25 are watched more closely for early mood changes, per NHS guidance on escitalopram, so doctors usually schedule an early check-in. For how the timing usually plays out, see how long does escitalopram take to work? In the meantime, having somewhere to put a hard moment can help while the medication takes effect. Niyora is a PMS and PMDD support app. Its Moon feature lets you write down what happened, see it from another angle, and draft a reply you can hold onto before sending it. Read more about [escitalopram for PMDD specifically](https://niyora.com/treatments/escitalopram-for-pmdd/). When to see a doctor If your mood feels worse than before you started, or you have thoughts of harming yourself, contact your prescriber the same day rather than waiting for a scheduled follow-up. ## Can escitalopram cause weight gain? Weight change with escitalopram is possible but inconsistent. Some people lose a little weight in the first few weeks as appetite dips alongside nausea. Others gain weight gradually over months of use, though this isn't universal and tends to show up later rather than early on. None of the trials behind this page measured weight directly, so there's no reliable number to give you here. If weight change matters to you, bring it up at your first follow-up appointment. A doctor can watch for a pattern over a few months and talk through whether to continue as is, adjust the dose, or try a different medication. ## How long do side effects last? Most side effects follow a rough timeline, though it varies by person. | Side effect | Usually starts | Usually eases | | --- | --- | --- | | Nausea | First few days | 1 to 2 weeks | | Headache | First few days | About 1 week | | Sleep changes | First 1 to 2 weeks | 2 to 4 weeks, though some notice it longer | | Dry mouth, sweating | First few weeks | Often persists at a low level | | Sexual side effects | Can start anytime | May continue as long as you take it | | Mood effects (less irritability) | Within the first treated cycle, with luteal-phase dosing [2] | Reported during the treated cycles studied [2]; longer-term data isn't available | If something hasn't budged after four to six weeks, or it's getting in the way of your day, that's worth a conversation rather than something to just wait out. ## When should you stop taking escitalopram? A doctor decides when and how to stop escitalopram, not a fixed date on a calendar. Stopping suddenly can bring back the symptoms it was treating, or cause its own short-term discomfort: dizziness, flu-like feelings, or odd sensations some people describe as brain zaps. Call your prescriber if: - Side effects haven't eased after four to six weeks - Your mood feels worse than before you started - Side effects are getting in the way of work, sleep, or relationships - You're planning a pregnancy or are already pregnant If you and your doctor decide to stop, tapering the dose down gradually over a few weeks usually causes fewer symptoms than stopping all at once. [Escitalopram dosage](https://niyora.com/treatments/escitalopram-dosage/) explains how doctors usually adjust the amount over time, both starting and stopping. ## What are the alternatives to escitalopram? Escitalopram is one of several SSRIs studied for premenstrual mood symptoms, and it isn't the only option if it doesn't suit you. - [Fluoxetine (Prozac)](https://niyora.com/treatments/fluoxetine-for-pmdd/) and [sertraline (Zoloft)](https://niyora.com/treatments/sertraline-for-pmdd/) are the other two SSRIs with the most trial evidence for PMDD; see [SSRIs for PMDD](https://niyora.com/treatments/ssri-for-pmdd/) for how they compare. - Taking an SSRI only in the luteal phase, rather than every day, is an option some doctors offer, and it's the dosing pattern used in the escitalopram trial above [2]. - Some hormonal contraceptives are used for PMS and PMDD, though they bring their own tradeoffs in cycle control and side effects [1]. - Magnesium supplements have weak, inconsistent evidence for easing anxiety in PMS; a systematic review found a benefit in about half the relevant trials it reviewed [3]. - Cognitive behavioral therapy (CBT) is recommended in guidelines alongside or instead of medication. A doctor who knows your history and other medications is the one who can weigh these against escitalopram for you. From the research library ## Research on SSRIs 528 studies in the library look at SSRIs in PMS and PMDD. They were published from 1971 to 2026, and each one has a short summary of what was tested and found. 528 studies, 1971 to 2026 How strong the studies are Strong study design 102 Moderate study design 156 Early or limited evidence 270 - [Review, 2026How well do SSRIs treat PMS?SSRIs like sertraline and fluoxetine are first-line treatments for severe PMS. They work at low doses, are safe with few side effects, and reduce symptoms by affecting serotonin and brain chemistry related to mood.Strong study design](https://niyora.com/research/papers/a-review-of-recent-reports-on-the-role-of-ssri-use-in-understanding-the-2026/) - [Systematic review, 2026Does continuous paroxetine or birth control work better for PMDD?Both antidepressants and birth control pills are effective for PMDD. Continuous paroxetine (an antidepressant) and DROS/EE 24/4 (a specific birth control) showed the strongest effects in studies reviewed, though the evidence comes from relatively few studies.Strong study design](https://niyora.com/research/papers/comparison-of-premenstrual-dysphoric-disorder-treatment-with-antidepressants-and-2026/) - [Systematic review, 2026Are there differences in brain activity in women with PMDD?Yes, women with PMDD show differences in brain activity compared to women without PMDD, particularly in areas involved in emotion regulation and stress processing.Strong study design](https://niyora.com/research/papers/functional-mri-evidence-of-brain-alterations-in-premenstrual-dysphoric-disorder-2026/) - [Study, 2026Are SSRIs the first treatment doctors recommend for PMDD?Yes, SSRIs are the recommended first treatment for PMDD. Taking them every day works better than taking them only before your period.Strong study design](https://niyora.com/research/papers/what-are-the-first-line-pharmacological-treatments-recommended-for-managing-2026/) - [Study, 2026Is there strong evidence that SSRIs work for PMDD?Yes, there is strong evidence that SSRIs help PMDD. Paroxetine and fluoxetine work particularly well, and taking them every day is generally better than taking them only during certain cycle phases.Strong study design](https://niyora.com/research/papers/what-is-the-evidence-base-for-treating-pmdd-with-ssris-2026/) - [Randomised trial, 2025Does taking an antidepressant only during the second half of your cycle reduce anger and aggression in PMDD?Yes. Taking escitalopram 20 mg during the second half of the menstrual cycle significantly reduced PMDD symptoms including irritability and anger, and reduced aggressive responses to provocation.Strong study design](https://niyora.com/research/papers/escitalopram-intermittent-use-and-brain-reactivity-to-aggressive-stimuli-in-2025/) ### Clinical trials - [Allopregnanolone and Dynamic GABA-A Receptor Plasticity in Selective Serotonin Reuptake Inhibitor Responsive Premenstrual Dysphoric DisorderRecruiting now, United States](https://niyora.com/research/trials/allopregnanolone-and-dynamic-gaba-a-receptor-plasticity-in-nct06704594/) - [Stress & Premenstrual Symptoms StudyCompleted, United States](https://niyora.com/research/trials/stress-premenstrual-symptoms-study-nct02777372/) - [Does Adding Oral Contraceptives to Fluoxetine Improve the Management of Premenstrual Syndrome?Status unknown, Egypt](https://niyora.com/research/trials/does-adding-oral-contraceptives-to-fluoxetine-improve-the-nct02562053/) [See all 528 studies on SSRIs and antidepressants](https://niyora.com/research/topics/treatment-ssri/) ## Questions people ask Does escitalopram cause weight gain? + Escitalopram's effect on weight is inconsistent. Some people lose a little weight in the first weeks as appetite dips, others gain weight gradually over months. There's no reliable number for how often this happens, so track changes yourself and mention them at a follow-up appointment. Can escitalopram make your mood worse before it helps? + Escitalopram's mood effects can go either way in the first couple of weeks. Some people feel steadier, others notice new anxiety, agitation, or emotional flatness before things settle. If your mood feels worse than before you started, contact your prescriber rather than waiting it out. How long do escitalopram's side effects usually last? + Escitalopram's physical side effects like nausea and headache often ease within one to two weeks. Sleep changes can take two to four weeks to settle, and sexual side effects sometimes continue as long as you're taking it. Mention anything that hasn't improved after a month. Is it safe to stop escitalopram suddenly? + Stopping escitalopram suddenly isn't recommended. It can bring back the symptoms it was treating, or cause short-term discomfort like dizziness or flu-like feelings. A doctor usually tapers the dose down gradually over a few weeks instead of stopping all at once. What's the difference between escitalopram and other SSRIs for PMDD? + Escitalopram, fluoxetine, and sertraline are the three SSRIs most studied for PMDD, and all three can be taken daily or only in the luteal phase. The right choice often comes down to side effect profile and what's worked for you or a close relative before. ## Sources - 1. [Comparison profiles of cycle control, side effects and sexual satisfaction of three hormonal contraceptives](https://doi.org/10.1016/j.contraception.2006.03.022), Contraception, 2006 - 2. [The effects of intermittent escitalopram treatment on impulsivity and inattention in women with premenstrual irritability and anger](https://doi.org/10.1017/s0033291725102055), Psychological medicine, 2025 - 3. [The Effects of Magnesium Supplementation on Subjective Anxiety and Stress-A Systematic Review](https://doi.org/10.3390/nu9050429), Nutrients, 2017 Ask AI about this page Copy prompt ChatGPT ↗ Claude ↗ Perplexity ↗ Google AI Mode ↗ Grok ↗ On this page - [What are the side effects of escitalopram?](#what-are-the-side-effects-of-escitalopram) - [Can escitalopram affect your mood?](#can-escitalopram-affect-your-mood) - [Can escitalopram cause weight gain?](#can-escitalopram-cause-weight-gain) - [How long do side effects last?](#how-long-do-side-effects-last) - [When should you stop taking escitalopram?](#when-should-you-stop-taking-escitalopram) - [What are the alternatives to escitalopram?](#what-are-the-alternatives-to-escitalopram) - [Research](#research) - [Questions](#faq) Niyora PMS & PMDD support For the hard moment before your period. Private, no account. [Get it on iPhone](https://apps.apple.com/app/niyora-pms-emotions/id6764561688) ## Keep reading Treatment Escitalopram (Lexapro) for PMS: does it work? Treatment Escitalopram (Lexapro) for PMDD: does it work? Treatment How to take Lexapro for PMDD: escitalopram dosing Treatment Escitalopram (Lexapro) for perimenopause mood: does it work? Treatment PMS treatment: what actually helps Condition What is PMS? Premenstrual syndrome, explained Treatment SSRIs for PMDD: does it work? Treatment Fluoxetine (Prozac) for PMDD: does it work?