Does Lexapro Cause Weight Gain? What the Evidence Shows

Weight gain has been reported with Lexapro, but the research describes small differences between groups, not what will happen to you. A large 2024 study of 183,118 adults in eight U.S. health systems compared weight change across eight common antidepressants. At six months, the adjusted average difference was 0.41 kg (about 0.9 pounds) more weight gain in adults initially prescribed escitalopram, the active ingredient in Lexapro, compared with adults initially prescribed sertraline (Zoloft). Petimar et al., Annals of Internal Medicine, 2024

That figure is a difference between two groups. It is not the total amount of weight a person gains on Lexapro, and it does not mean that everyone who takes it gains weight.

We wrote this guide for anyone who takes Lexapro, or is discussing it with a prescriber, and wants to understand a change in weight or appetite. It is meant to support the conversation with the clinician who prescribed it, not to replace it. Majesta Health does not offer Lexapro or psychiatric prescribing, and this article does not suggest changing depression or anxiety treatment through a weight-loss service.

What the Lexapro label says about weight

Lexapro is approved in the United States to treat major depressive disorder in adults and children 12 and older, and generalized anxiety disorder in adults and children 7 and older. FDA prescribing information and Medication Guide for Lexapro, revised April 2024

The label describes three kinds of evidence about weight and appetite.

• Controlled trials: people treated with Lexapro did not differ from people given a placebo in clinically important weight change.
• Appetite: in adult studies of depression and of generalized anxiety disorder, decreased appetite was among the side effects reported more often with Lexapro than with placebo. Increased appetite and increased weight appear on a separate list of reactions reported during the drug's premarketing studies, which included open-label treatment for up to a year.
• Reports after approval: decreased weight is among the reactions reported after Lexapro reached the market. The label explains that, because these reports are voluntary, it is not always possible to reliably estimate how often a reaction happens or to establish whether the drug caused it.

Weight gain is not among the side effects in the label's adult tables of reactions reported more often with Lexapro than with placebo. That does not rule out a change for an individual.

Why the label and the 2024 study can both be right

The label and the study answer different questions.

• The label's weight statement compares Lexapro with placebo in controlled clinical trials.
• The 2024 study used health records from 2010 to 2019 to compare adults starting one of eight common antidepressants. Sertraline was the reference medicine, and the study had no group of people taking no antidepressant.

The authors report that average weight went up with every medicine they studied. Because there was no comparison group of non-users, they treated differences between medicines as the least biased result. So the 0.41 kg figure compares escitalopram with sertraline. It does not measure how much weight Lexapro adds compared with taking no antidepressant.

The study was observational, so people were not randomly assigned to a medicine. The researchers used methods designed to imitate a randomized trial, and they note that some confounding was likely still present.

Escitalopram vs. sertraline in the 2024 study

Source: Petimar et al. 2024, Table 4, main analysis. These are averages for groups of adults, not predictions for one person.

The researchers also estimated the chance of gaining at least 5% of starting weight. At six months, that chance was about 1.15 times as high for adults initially prescribed escitalopram as for adults initially prescribed sertraline. This is a relative comparison, not the share of people who gained that much.

Other medicines in the same study showed a range. Paroxetine and duloxetine had six-month differences close to escitalopram's, citalopram and venlafaxine had smaller ones, fluoxetine was similar to sertraline, and bupropion was linked with less weight gain than sertraline. Our guide to duloxetine (Cymbalta) and weight covers what that label reports. We also explain what the Wellbutrin label says about weight.

The authors suggest that clinicians and patients could consider these differences when choosing an antidepressant. If you already take Lexapro, any decision about your treatment also depends on how well it is working for you, and it belongs in a conversation with your prescriber.

What these numbers cannot tell you

• Your own result. An average difference between groups cannot predict whether you will gain weight, lose weight or stay about the same.
• The cause of a change you notice. To make a fairer comparison, the researchers set aside people with recent cancer, pregnancy or bariatric surgery, and in one check people taking stimulants, steroids or weight-loss medicines, because each is associated with weight change. Your prescriber needs your full history for the same reason.
• Effects of different doses. The study did not have consistent dose information.
• The longer term. By 24 months the difference from sertraline was smaller and no longer clear, but by then few people still met the study's prescription-based definition of staying on the initial medication.
• Children and teens. The study included adults aged 20 through 79.
• Complete records. The data showed prescriptions written, not whether medicines were filled or taken, and only a minority of people had a weight recorded at each checkpoint.

Before you change anything

Do not stop taking Lexapro or change how you take it on your own because of a weight change. The Medication Guide says stopping Lexapro suddenly may cause serious side effects. Symptoms may include changes in mood, irritability, dizziness, headache, problems sleeping and electric shock sensations. The prescribing information recommends a gradual dose reduction rather than abrupt stopping whenever possible, directed by your prescriber.

If you and your prescriber decide a change makes sense, they can plan it with you and tell you what to watch for.

When to get help right away

Lexapro has a boxed warning: antidepressants increased the risk of suicidal thoughts and behaviors in children and young adults in short-term studies, and anyone taking an antidepressant should be closely monitored for worsening and for new suicidal thoughts and behaviors. The Medication Guide says antidepressants increase this risk in people 24 and younger, especially in the first few months of treatment or when the dose is changed.

The Medication Guide says to call your healthcare provider or get emergency medical help right away for symptoms such as thoughts about suicide or dying, acting on dangerous impulses, new or worse depression or anxiety, panic attacks, feeling very agitated or restless, or other unusual changes in mood or behavior, especially if they are new, worse or worry you. Contact your prescriber right away if symptoms are new or getting worse. In the U.S., call 911 or go to the nearest emergency department for immediate danger or a medical emergency. You can also call or text 988 for crisis support.

Questions to take to your prescriber

1. Could this change in weight or appetite be related to Lexapro, to changes in my symptoms, or to something else in my health or routine?
2. How well is Lexapro working for my mood or anxiety, and how should we weigh that against this change?
3. What should I track before our next visit, and how often?
4. If a change in treatment is ever considered, how would we plan it, and what should I watch for?
5. Who should I contact between visits if my mood gets worse or a side effect worries me?

Bring the date you started Lexapro, any weights you already have, and a list of all your medicines and supplements. If weighing yourself is distressing, you can ask for another way to keep track.

This article is for informational purposes only and does not constitute medical advice, diagnosis or treatment. It does not recommend starting, stopping or changing any medicine. Sources checked November 5, 2026.