Lexapro vs. Wellbutrin: The Real Difference Is How They Feel, Not How Strong They Are

Maybe your doctor mentioned both. Maybe a friend told you one of them wrecked their sex drive, someone else said the other made them jittery, and now you’re not sure what’s true.

Depression involves several of your brain’s chemical messengers, and these two medications reach for different ones. Lexapro (escitalopram) blocks the reuptake of serotonin, while Wellbutrin (bupropion) acts on norepinephrine and dopamine and doesn’t block serotonin reuptake, according to their FDA labels. That difference in mechanism, more than any difference in strength, shapes how each one feels day to day. Matching the medication to the person takes precision.

The standard first step for depression has long been an SSRI like Lexapro, and the evidence behind antidepressants as a group is strong. A Lancet network meta-analysis of 522 trials with 116,477 participants found that all 21 antidepressants studied were more effective than placebo, and escitalopram was among the more effective drugs in head-to-head trials. The results are real, and the science is well established.

But picking the right medication is only half the job, and at Siggy we don’t think care should end when the prescription is written.

Siggy’s free, anonymous intake captures the details that steer this choice, like how much anxiety is in the mix, how you’re sleeping, and which side effects would make you want to quit. A licensed prescriber reviews that full picture before recommending anything, and your care plan can be adjusted as you go. That way the decision rests on your symptoms and each drug’s pharmacology, and that approach is grounded in clinical evidence.

What This Page Covers

• How Do Lexapro and Wellbutrin Work?
• Which Works Better for Depression?
• Which Is Better if You Also Have Anxiety?
• How Do Their Side Effects Compare?
• Can You Take Lexapro and Wellbutrin Together?
• What Happens After You Start?
• Start Your Anonymous Intake

How Do Lexapro and Wellbutrin Work?

Lexapro is a selective serotonin reuptake inhibitor, or SSRI. Lexapro’s FDA prescribing information lists two approved uses: major depressive disorder and generalized anxiety disorder.

Wellbutrin belongs to a different class. The Wellbutrin XL FDA label describes it as a relatively weak inhibitor of norepinephrine and dopamine reuptake that doesn’t inhibit serotonin reuptake. It’s approved for major depressive disorder and for preventing seasonal depression, and a sustained-release form of bupropion is also approved to help people quit smoking.

Here’s how the two compare at a glance, based on their FDA labels and the studies cited below.

Feature	Lexapro (Escitalopram)	Wellbutrin (Bupropion)
Main targets	Serotonin	Norepinephrine, dopamine
FDA-approved uses	Depression, generalized anxiety	Depression, seasonal depression prevention
Sexual side effects	More common than placebo	Similar to placebo
Weight	Slightly more gain	Least gain of common options
Seizure risk	Use caution with seizure history	Dose-related, avoid with seizure disorder
Common side effects	Nausea, insomnia, sleepiness	Dry mouth, nausea, insomnia

Which Works Better for Depression?

For depression alone, there’s no clear winner. In the Lancet network meta-analysis, differences between individual antidepressants were modest, and most comparisons had wide uncertainty ranges. That’s why prescribers usually choose between Lexapro and Wellbutrin based on your other symptoms and side effect priorities rather than raw strength.

Which Is Better if You Also Have Anxiety?

Lexapro has the clearer case here, since it carries FDA approval for generalized anxiety disorder and Wellbutrin doesn’t. When depression comes with high anxiety, a pooled analysis of 10 trials found response rates of 65.4% with SSRIs and 59.4% with bupropion. The authors calculated that about 17 people would need an SSRI instead of bupropion to produce one extra responder, a modest difference.

The popular idea that Wellbutrin always worsens anxiety isn’t supported by the averages. A separate individual patient data analysis of 10 trials found bupropion and SSRIs improved anxiety symptoms in depression to a similar degree. Individual reactions still vary, and the Wellbutrin label lists anxiety, agitation, and insomnia among side effects seen at higher doses. Our guide on when doctors choose bupropion over an SSRI goes deeper.

How Do Their Side Effects Compare?

Side effects are where these two medications differ most, and they’re a major reason people stop treatment.

Sexual Side Effects

A Journal of Clinical Psychopharmacology meta-analysis, using studies that asked about sexual function directly, found escitalopram caused significantly more sexual dysfunction than placebo, while bupropion didn’t differ from placebo. Lexapro’s label also notes that patients often don’t report these effects on their own, so label rates likely underestimate them. If this matters to you, bring it up before you start.

Weight

A 2024 Annals of Internal Medicine study of 183,118 patients across eight U.S. health systems found escitalopram was linked to about 0.4 kg more weight gain at six months than sertraline, and a 10% to 15% higher risk of gaining at least 5% of body weight. Bupropion showed the least weight gain of the eight drugs studied and a 15% lower risk of that level of gain. Our guide to Lexapro and weight gain covers what helps.

Sleep and Energy

Both can affect sleep. In Lexapro’s depression trials, insomnia occurred in 9% of patients versus 4% on placebo, and sleepiness in 6% versus 2%. In trials of sustained-release bupropion at 300 mg a day, insomnia occurred in 11% versus 6% on placebo, along with dry mouth and nausea.

Seizure Risk and Who Should Avoid Wellbutrin

Wellbutrin’s seizure risk is dose-related. Its label reports a seizure rate of about 0.1% with sustained-release bupropion up to 300 mg a day, rising at higher doses. Wellbutrin is contraindicated in people with a seizure disorder, a current or past eating disorder such as bulimia or anorexia, or abrupt withdrawal from alcohol, benzodiazepines, or similar sedatives. It can also raise blood pressure, so your prescriber should check it.

Can You Take Lexapro and Wellbutrin Together?

Yes, and prescribers combine them on purpose. In the STAR*D augmentation trial, adding sustained-release bupropion to citalopram, an SSRI, proved useful for people whose depression hadn’t fully responded, with fewer side effects than the comparison add-on.

The combination needs supervision. Bupropion inhibits a liver enzyme called CYP2D6, which can raise levels of other medications, and its label reports that bupropion increased levels of citalopram, a close relative of escitalopram, by 30% to 40% in one study. Your prescriber will check everything you take before combining them.

What Happens After You Start?

Both medications usually take several weeks to reach their full effect, and side effects often show up first. That gap is where many people give up. In the 2024 weight study, only 28% to 41% of people were still taking their antidepressant as prescribed six months later.

That’s the problem Siggy is built around. Choosing between Lexapro and Wellbutrin matters, but so does having someone notice when nausea, insomnia, or a drop in libido starts pushing you toward quitting. Our guide on how to know if an antidepressant is working explains what to track. This guide is for education and isn’t a substitute for advice from your own prescriber. If you’re having thoughts of harming yourself, call 911 or call or text 988.

Start Your Anonymous Intake

Lexapro and Wellbutrin are both effective for depression, so the better choice comes down to you: whether anxiety is part of the picture, how you feel about sexual side effects and weight, and whether anything in your history rules one out. You don’t have to sort through that alone or guess from someone else’s experience. Start your anonymous intake with Siggy and describe your symptoms, priorities, and medication history in your own words, without giving your name or email. It’s free, a licensed prescriber reviews your full clinical picture before anything is prescribed, and you’ll get a downloadable summary you can share with any clinician.