Lexapro is a prescription antidepressant used to treat depression and anxiety. It can be an important part of treatment, and plenty of people worry about weight changes after starting it. Lexapro and weight gain are connected for some people, but the relationship is not the same for everyone.
What Is Lexapro?
Lexapro is the brand name for escitalopram, a selective serotonin reuptake inhibitor (SSRI) approved to treat major depressive disorder and generalized anxiety disorder.1
SSRIs increase the availability of serotonin, the chemical messenger involved in mood regulation. Serotonin also affects appetite, digestion, and sleep, which is one reason weight changes turn up for some people on antidepressants.
Like any medication, Lexapro carries side effects. Nausea, trouble sleeping, sleepiness, fatigue, sweating, sexual side effects, and appetite changes are all listed among possible adverse effects of escitalopram.1
Does Lexapro Cause Weight Gain?
It can, in some people. Others lose weight, and many notice little or no change at all.
Research links antidepressant use to weight gain over time. A large population-based cohort study found that antidepressant prescribing was associated with an increased risk of gaining at least 5% of baseline body weight, with the risk peaking during the second and third years of treatment.2
More recent research comparing common antidepressants found that people starting escitalopram had a slightly higher risk of gaining at least 5% of baseline weight than people starting sertraline, while bupropion was associated with less weight gain.3
None of that means Lexapro automatically causes major weight gain. It means weight belongs in the conversation as part of your overall treatment plan.
Why Lexapro May Affect Weight
There is no single mechanism. Antidepressant-related weight change usually comes from several factors overlapping.
Psychiatric medications can contribute to weight gain through effects on appetite, metabolism, and cravings, and lifestyle and health factors carry real weight too.4
How Much Weight Can You Gain?
It varies widely. Some people gain a small amount; others notice more meaningful change over time.
Average weight changes with antidepressants are modest in most studies. The problem with averages is that they do not describe any individual. One person gains very little. Another gains enough that it affects comfort, confidence, health, or willingness to stay on treatment.
A 2024 study in the Annals of Internal Medicine found small differences in average weight change across several first-line antidepressants, with escitalopram, paroxetine, and duloxetine associated with a 10% to 15% higher risk of gaining at least 5% of baseline weight compared with sertraline.3
If this concerns you, tracking weight, appetite, activity, and symptoms helps you spot trends early rather than being surprised months in.
Other Reasons Weight Might Change
Blaming the medication first is natural. Weight gain comes from many directions, and Lexapro side effects may be one factor among several.
How to Manage Weight Changes on Lexapro
If you notice weight gain after starting Lexapro, you do not have to choose between your mental health and your physical health. The goal is protecting both.
Try not to treat this as punishment. You are not failing at anything. You are gathering information and adjusting a plan.
Should You Stop Lexapro If You Gain Weight?
Not suddenly, no. Stopping abruptly can cause discontinuation symptoms: worsening anxiety, mood changes, dizziness, irritability, sleep problems, or a return of depression.
Lexapro labeling advises monitoring when treatment is discontinued, because discontinuation symptoms occur when stopping SSRIs.1 If the medication is working for your mental health but the weight gain is becoming a problem, that is a conversation with your provider, not a decision to make alone.
Possible next steps include adjusting the dose, reviewing diet, activity, sleep and other medications, switching to a different antidepressant, adding therapy or lifestyle support, or evaluating medical causes of the change.
Which Antidepressants Are More Likely to Affect Weight?
Different antidepressants carry different weight profiles, and none affects everyone the same way.
Antidepressants Associated With Weight Gain
Mirtazapine is the one most consistently linked with increased appetite and weight gain, to the point that it is sometimes prescribed for that effect. Paroxetine may carry a higher weight-gain risk than some alternatives in its class. The tricyclics, including amitriptyline and nortriptyline, may affect both appetite and weight, and some MAOIs may contribute to weight gain as well.
Antidepressants Associated With Less Weight Gain
Bupropion sits at the other end. It is often associated with less weight gain than other antidepressants, and some studies report modest weight loss.3
Bupropion is not right for everyone. If weight matters to you, it is entirely reasonable to raise it before starting or changing an antidepressant.
When Weight Concerns Affect Mental Health
Weight gain is frustrating, particularly when you started Lexapro hoping to feel better and now feel worried about your body instead. Those feelings deserve to be taken seriously rather than waved off.
Weight concerns can affect:
Medication adherence: the temptation to skip doses or stop entirely
Mood and self-esteem: body changes can worsen anxiety, shame, or depression
Eating patterns: some people become overly restrictive, or cycle between restriction and overeating
Trust in treatment: side effects can leave you feeling discouraged or unheard
If weight worries are affecting your mental health, therapy can help with the emotional side while your provider handles the medication decisions. You deserve a plan that addresses your whole health, not one symptom at a time.
Getting Support
Lexapro and weight gain are connected for some people and not others. A change on the scale does not automatically mean Lexapro caused it, or that you need to stop taking it.
A thoughtful plan can include medication review, therapy, nutrition support, movement, sleep care, and monitoring. If Lexapro is helping your depression or anxiety, the goal is managing side effects without putting your mental health at risk.
If substance use or untreated mental health symptoms are part of the picture, reaching out for professional help is worth doing now rather than later. You can also search our directory of treatment programs by location, insurance, and level of care.
Related Topics
Lexapro Weight Questions People Ask Most
Does Lexapro cause weight gain?
It can for some people, and not everyone experiences it. Appetite, mood improvement, activity level, metabolism, sleep, and other medications all factor in.
How much weight can you gain on Lexapro?
It varies. Some gain little or nothing; others see gradual gain over time. Research suggests escitalopram carries a slightly higher risk of gaining at least 5% of baseline weight than some alternatives.
Why does Lexapro cause weight gain?
Through appetite changes, cravings, fatigue, sleep changes, improved mood, and serotonin's effects on hunger and metabolism. Depression and anxiety affect weight on their own too.
Can you lose weight while taking Lexapro?
Yes. Many people lose weight or hold steady. Regular eating patterns, movement, sleep, stress management, and a medication review all help.
Will weight go down after stopping Lexapro?
It may for some people, depending on appetite, activity, metabolism, and mental health symptoms. Do not stop suddenly without medical guidance.
Which antidepressant causes the least weight gain?
Bupropion is generally associated with less weight gain and modest loss in some studies. Whether it suits your symptoms and history is a decision for your provider.
